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101Back to top Go down    Re: K75kforkurz on Wed Dec 12, 2018 9:54 pm

Two Wheels Better


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From vocabulary.com: A motto is a short sentence or phrase that expresses a rule for sensible behaviour, especially a way of behaving in a particular situation. Our motto is 'Plan for the worst and hope for the best', or favourite saying, like 'When life hands you lemons, make lemonade.' A motto is something you might see on a t-shirt or bumper sticker — a short sentence or phrase that has meaning for that person. Some mottoes have to do with politics, religion, or another belief.


Since it's a Moto Guzzi I reckon it can't be reasonably called 'sensible behaviour', so it must fall under the category of 'another belief', or possibly something to do with hoping for the best.

    

102Back to top Go down    Re: K75kforkurz on Wed Dec 12, 2018 9:57 pm

Dai

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See that wallaby...


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

103Back to top Go down    Re: K75kforkurz on Wed Dec 12, 2018 10:11 pm

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This was my early Sunday morning view at the Moto Guzzi Club of Victoria's annual Spaghetti Rally back in October. Much red wine, pasta & firewood was consumed. I have some sympathy for the beasts and the men & women who ride them.


__________________________________________________

1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

104Back to top Go down    Re: K75kforkurz on Thu Dec 13, 2018 10:08 pm

chris846

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'When life hands you lemons, make lemonade.'


Here in the poetic wilderness of Baaarnsley, our version is,

You have to p**s with the Pr**k you've got.

Great motto though. Maybe explains why I've drunk a lot of lemonade...


__________________________________________________
The Longest Lunch
    

105Back to top Go down    Re: K75kforkurz on Tue Dec 18, 2018 8:56 pm

chris846

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Oh dear #2

Thought I'd best have a look inside this mystery engine, and found this...


Maybe those rags that had been encouragingly stuffed into all the orifices when I bought then engine, hadn't been there all the time. Maybe.
Anyway, after scientific analysis of the strange contents of cylinder No 1, turns out it is definitely CRUD.
Things weren't too bad after it all cleaned up, but the honing marks on the bores are hardly visible, and there's a bit of corrosion on the deck where it looks like the, erm, rainwater has started to work its way out of the cylinder past the head gasket.



Also, this is the exhaust cam. Am very familiar with this type of hard surface failure, as a result of owning oilhead boxers:


And lastly, here's the measured valve clearances. I say 'clearances', what we've really got here are 'avoidances' - whoever let the bike get to this stage obviously didn't want the valves to carry on opening. Maybe it was to prevent any more rain and crud getting in? (the clearances are circled - and read as you look at the cylinder head)



This whole engine looks like a bit of of a car crash. I'll sling it back together, with a new cam, and a WHOLE NEW set of shims, but with the original gasket. If it makes more than half a fart compression when it's all done, I'll show my *#@* on **@#* town hall steps **##* ~@*** Joan Collins too.



Last edited by chris846 on Tue Dec 18, 2018 9:25 pm; edited 1 time in total


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106Back to top Go down    Re: K75kforkurz on Tue Dec 18, 2018 9:02 pm

charlie99

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whilst you have it apart chris , perhaps a valve lap would be appropriate  to clean up the seats at least ?

good luck


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

107Back to top Go down    Re: K75kforkurz on Tue Dec 18, 2018 9:13 pm

chris846

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Hiya Charlie, how's summer?

I took the valves out and surprisingly the valves and seats seemed pretty much okay underneath the crud. There was a goodly layer of oil and carbon underneath everything (you can see this in bores 2 & 3 in the pics), so I wonder if it had stood for a few years on its sidestand, before the rain, hail, locusts etc. found their way in. 
K's eh - inbuilt self-preservation?


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108Back to top Go down    Re: K75kforkurz on Wed Dec 19, 2018 9:18 am

chris846

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Thinking on - maybe those silly valve clearances were due to crud being trapped between valve and valve seat? Must investigate before I spend the Christmas drinking budget on a set of custom made super thick shims. (Many thanks to my 2 dogs for providing me with this idea during this morning's walk. Very intelligent dog, the Labrador)


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The Longest Lunch
    

109Back to top Go down    Re: K75kforkurz on Wed Dec 19, 2018 9:40 am

RicK G

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Quite likely Chris BMW recommend doing the shims before the spark plugs are removed due to the possibility of carbon bits getting caught in the seat and making a mess of the job.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

110Back to top Go down    Re: K75kforkurz on Wed Dec 19, 2018 8:17 pm

chris846

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Well it looks like the dogs called it. Checked the valve clearances again and they're a lot more normal. Still need to swap a few shims though - it's the exhaust valve clearances that have opened up. Weird about the dogs though, I always thought that their special talent was eating up their own puke.

Anyway, I went hunting for valve shims and opened up an old K100 engine that I bought ages ago just to use as a jig for making some headers. It had supposedly come from a running bike with Starship Enterprise mileage:



How bad is that? And why is it always No 1 cylinder that fills with crud?

Anyway, did you spot the No 2 exhaust valve -



Now that really is weird. I mean, how can you run a bike with....this?


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111Back to top Go down    Re: K75kforkurz on Wed Dec 19, 2018 8:48 pm

Dai

Dai
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@chris846 wrote:Now that really is weird. I mean, how can you run a bike with....this?
Easy Very Happy . I burnt out both exhaust valves over 200,000 miles on the V1000G5 and only got round to replacing them each time when I got a bit peeved with the lack of performance. No damage to the valve seat in either case. I've always suspected that unleaded fuel had a part to play in the failure.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

112Back to top Go down    Re: K75kforkurz on Wed Dec 19, 2018 9:32 pm

chris846

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So that's just a burned out valve, not some zombie pizza-eating mystery motorbike gremlin?


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The Longest Lunch
    

113Back to top Go down    Re: K75kforkurz on Thu Dec 20, 2018 12:25 am

RicK G

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Nope just too much heat due to unleaded fuel as Dai has said


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

114Back to top Go down    Re: K75kforkurz on Thu Dec 20, 2018 9:13 am

chris846

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That's food for thought then. The engine has the lighter crank and the 12 rivet aux shaft. The casings are marked '90' so it's a least a 1990 model. Weren't they supposed to be unleaded-proof by then?

There's also at least one replacement valve already in there - No 4 exhaust. No 1 & No 3 are well on their way to joining No 2

And you're right - the No 2 valve seat from the burned valve doesn't look bad at all.


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115Back to top Go down    Re: K75kforkurz on Thu Dec 20, 2018 12:41 pm

RicK G

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The seat wont burn it's stellite and has good heat dissipation. The over heating will start when the valve starts riding and doesn't touch the seat so the heat builds up. It probably never had the valve clearances checked since it stopped going to the dealer when warranty ran out.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

116Back to top Go down    Re: K75kforkurz on Sun Dec 23, 2018 5:34 pm

chris846

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Not so big end.

After finding Tutenkhamun's remains inside No1 cylinder, I decided to have this mystery engine apart altogether.
No1 big end shells were so-so, No2 were awful, No3 were like new. Have a look at these sorry pics:





At first I thought of oil problems - something's happened to overheat the rod and cap, and that's worn the shells too.
The mains are fine btw. Checked the crankshaft journals - big end and main journals are within spec, even poor old No2 (Haynes manual figures). Although the bottom end looks a horror story (which I first thought it was) everything's actually within spec and not bad looking, apart from the No 2 rod and shells.

A test reassembly led to No2 rod actually being tight on the crank - what? How is that with such worn shells? After swapping parts and head scratching, it turns out the big end bore in the No2 rod is undersize.

Bear with me, I could be losing the plot, but the measured bore in the No2 rod is 40.91mm. Haynes spec is min 41.00mm. No1 rod is slightly small at 40.98, No3 rod is fine. This matches the state of the shells - they have worn because of the small bores in the rods.

I went foraging and dug out some other rods (K100) they are all min 41.00mm.

So how does a rod shrink?

The bores are circular - measured at 90' so they don't seem small due to distortion. The mating faces of the caps show no sign of being machined down. The No2 rod is very tight when assembled, even with this amount of wear (the No2 shells have lost about 1.5 thou thickness radially) - so how on earth can it have left the factory like this - if that's what happened?


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117Back to top Go down    Re: K75kforkurz on Sun Dec 23, 2018 7:17 pm

Dai

Dai
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It was a Christmas engine. Fritz drank too much gluhwein.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

118Back to top Go down    Re: K75kforkurz on Sun Dec 23, 2018 7:44 pm

Two Wheels Better

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Hence the ground away engine number...someone rode it like they stole it!


__________________________________________________

1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

119Back to top Go down    Re: K75kforkurz on Fri Dec 28, 2018 3:44 am

charlie99

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I would be reconning that some one did the heat the exhaust pipes up till they are glowing red , from dead cold ...ie full stick till it stops

such a shame

good luck with the repairs mate ….k100 rods k75 pistons  , but you might need a new crank ?


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

120Back to top Go down    Re: K75kforkurz on Fri Dec 28, 2018 4:20 am

MartinW

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With the blueing on number 2 rod looks like overheating.
Regards Martin.


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K75s Hybrid
    

121Back to top Go down    Re: K75kforkurz on Sat Dec 29, 2018 5:21 pm

chris846

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Ah, mystery solved...


 No, this isn't a pair of ex-Valentino Rossi conrods, the two engraved numbers - should - indicate matching conrods and caps (ARE YOU LISTENING PREVIOUS OWNER?).
Turns out that somebody decided to reassemble the bottom end after shuffling the components. This is what caused the 'tight' No2 conrod big end and the overheating/blueing. Unbelievably, putting 46 with 46, and 5 with 5 gives a pair of rods with correct big end bore sizes. Who'd've f*##*ng thought that!
The mystery had been bugging me, and I must have been stupid (again) not to have checked this when I first came across the tight rod. I guess you just assume that the absolute fundamentals don't get overlooked, even by novices.
As well as this, the main bearing caps weren't in the correct order either (they have stamped numbers) Not such a serious problem as the line boring and milling must be done to the same datum.
Lesson learned. I always lay components out in the correct order on disassembly and don't usually check for numbers or marks that might or might not be there. From now on I'll double check. Every day is a school day.
Just in case I felt any of my usual 'mistakes happen' sympathy about the previous spannerman, here's the bolt (top in the picture, versus the correct item underneath) that was performing the minor, not at all important function, of holding the timing chain sprocket on the front of the crank:


What is this, 'war on the crankshaft'...?

The crank is hardened, so it must have taken a bewildering amount of mechanical indifference to wind what is obviously an engine mounting bolt into the end of the crank. I guess somewhere there is a K75 with the engine hanging on.....I daren't think.


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122Back to top Go down    Re: K75kforkurz on Wed Jan 02, 2019 10:30 pm

chris846

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Kids, if you smoke and eat butter, here's what your arteries will end up looking like...
The bits of gauze that you can actually see, are where the crud has already fallen off. I've not come across the later, plastic pickup before, but I have this awful feeling that it didn't start its life concave...


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The Longest Lunch
    

123Back to top Go down    Re: K75kforkurz on Wed Jan 02, 2019 11:22 pm

Arlina

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@charlie99 wrote:I would be reconning that some one did the heat the exhaust pipes up till they are glowing red , from dead cold ...ie full stick till it stops

such a shame

good luck with the repairs mate ….k100 rods k75 pistons  , but you might need a new crank ?
It wasn't me, first let the engine warm up Smile

https://www.youtube.com/watch?v=0dvruYzv-u8


__________________________________________________
  K1100RS/LT - R1200RT - K100LT 16v - R1100RS (RIP) - Cagiva SST 350 Ala Verde 
    

124Back to top Go down    Re: K75kforkurz on Wed Jan 02, 2019 11:23 pm

Point-Seven-five

Point-Seven-five
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Oh, my!  That is disturbing! 

Another job added to my winter to-do list so I can sleep soundly when riding season rolls around again.


__________________________________________________
Present:
1994 K75RT
1991 K100RS

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

125Back to top Go down    Re: K75kforkurz on Wed Jan 02, 2019 11:48 pm

RicK G

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Chris it's very simple. It's world v idiots so far world 0 idiots infinity


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

126Back to top Go down    Re: K75kforkurz on Thu Jan 03, 2019 12:00 am

Woodie

Woodie
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Fokkin' 'ell Batman!  I am in a perpetual state of second guessing the work that I do on my lovely K - did I get everything back together according to the diagram? did I remember to do the seventh step of the secret handshake or am I just thinking I remembered? - THAT is just low down back yard butchery (especially the bolt).  At least you get to make things right and we get to learn.

After a lifetime in construction there is just nothing that will surprise me.  Not saying I've seen it all by any stretch.  The male of the species is profoundly capable of reasoning out the most diabolical solutions in my experience.


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

127Back to top Go down    Re: K75kforkurz on Thu Jan 03, 2019 12:55 am

Two Wheels Better

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It's all good, and you need only have faith,  in the chicken bone dance.
bounce


__________________________________________________

1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

128Back to top Go down    Re: K75kforkurz on Thu Jan 03, 2019 9:07 pm

chris846

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"It's all good, and you need only have faith,  in the chicken bone dance."


Yes of course, and these kinds of shoes is often donned, too....


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The Longest Lunch
    

129Back to top Go down    Re: K75kforkurz on Thu Jan 03, 2019 10:00 pm

Two Wheels Better

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Funny that, and a few days ago that guy reappeared. I caught it, deleted the three new abstract 'sneaker' posts, and Crazy Frog deleted his account. It was someone, this time, calling themself Amberfrancis. What a bizarre way to push your message.


__________________________________________________

1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

130Back to top Go down    Re: K75kforkurz on Thu Jan 03, 2019 11:07 pm

RicK G

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He popped up on one other forum I frequent and got the same treatment. It's hard to imagine that the type of advertising really gets anywhere especially when almost everyone that is net savvy just ignores them.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

131Back to top Go down    Re: K75kforkurz on Fri Jan 04, 2019 9:40 pm

jayk47

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This whole thread has made for epic reading! fun and educational!  Very Happy

    

132Back to top Go down    Re: K75kforkurz on Sat Jan 05, 2019 4:59 pm

chris846

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Hi Jay, I haven't even started yet!
So far it's all fantasy - nothing has really been tried and tested in the real world, so all my bright ideas and convincing-sounding technoguff are floating on unchallenged. The real work will come when I fire the thing up and set off down the road and it catches fire/falls in half/steers into a ditch or, worst of all, is boring.


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The Longest Lunch
    

133Back to top Go down    Re: K75kforkurz on Sat Jan 05, 2019 5:28 pm

92KK 84WW Olaf

92KK 84WW Olaf
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@Dai wrote:
@chris846 wrote:Now that really is weird. I mean, how can you run a bike with....this?
Easy Very Happy . I burnt out both exhaust valves over 200,000 miles on the V1000G5 and only got round to replacing them each time when I got a bit peeved with the lack of performance. No damage to the valve seat in either case. I've always suspected that unleaded fuel had a part to play in the failure.

I did exactly that on a Fiat 128 years back, of 1981 vintage. Towed a boat and figured the leaded petrol I paid for had the tank at the petrol station filled with regular. Head off and one valve identical to that one but otherwise engine was perfect.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 90,975 miles
1983 K100RS 0011175 Fricka 29,495 miles Damn K Pox
    

134Back to top Go down    K75forkurz on Sat Jan 05, 2019 7:58 pm

Tom FKR

Tom FKR
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There seems to be some kurzcomings  with exhaust valves in some engines????


__________________________________________________
1993 K75 Slightly Modified
2010 BMW F650GS Twin
1992 R100R
    

135Back to top Go down    Re: K75kforkurz on Sun Jan 06, 2019 11:24 am

jayk47

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@chris846 wrote:Hi Jay, I haven't even started yet!
So far it's all fantasy - nothing has really been tried and tested in the real world, so all my bright ideas and convincing-sounding technoguff are floating on unchallenged. The real work will come when I fire the thing up and set off down the road and it catches fire/falls in half/steers into a ditch or, worst of all, is boring.
Ha.. Thats the only way to have it boss! go big or go home, or in the case of a bike what you modified yourself, into the hedge. 

Keep it coming, will be waiting for further installments in the Yorkshire frankenbrick .. 

j


__________________________________________________
Learning how to repair the bike i broke......
    

136Back to top Go down    Re: K75kforkurz on Wed Feb 06, 2019 8:13 pm

chris846

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Just about to start finish welding the frame, now that I've sorted out all the various lugs and whatnots it needs to mount modules, brake fluid reservoir, battery etc.
Thought I'd post a few pics to show it side by side with a standard K75 frame (less the cafe-racered lopped off back end, naturally, ahem) The engine/gearbox mountings are lined up together:




And here's one of the design team - you can see their careful approach to things in the way they've chosen to modify their own sofa:


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The Longest Lunch
    

137Back to top Go down    Re: K75kforkurz on Thu Feb 07, 2019 1:13 am

charlie99

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@chris846 wrote:
And here's one of the design team - you can see their careful approach to things in the way they've chosen to modify their own sofa:


aww sweet pups, wouldn't hurt a fly in this mode


nice frame works chris


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

138Back to top Go down    Re: K75kforkurz on Thu Feb 07, 2019 2:56 am

Woodie

Woodie
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I've seen that same innocent look before after much the same sofa mod.  Sadly it was the one we stored for the mutt in our living room.  Lovely work on the frame Chris.  TIG?


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

139Back to top Go down    Re: K75kforkurz on Fri Mar 22, 2019 5:15 pm

chris846

chris846
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Yep, TIG for the frame. The welding set gave up half way through and had to be replaced. Things just keep getting smaller don't they? the new one is half the size of the old one, and much better.

Anyway, the frame is now fully welded. Here's some boring pics of the various mundane brackets and stuff to hold the ECU and things. 




The second photo shows the extension to the steering head, which was necessary for the longer length of the KTM yoke stem.

Now then, back to something much more bizarre, in keeping with my normal theme. Can anyone see what's going off here?


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The Longest Lunch
    

140Back to top Go down    Re: K75kforkurz on Sat Mar 23, 2019 3:42 am

tinyspuds

tinyspuds
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I’ve been quietly pleased with how my (with much help from all on here) re-commissioning project has been going . But having read this thread I just feel... inadequate. Fantastic vision Chris and showing interest in the decorating project at the same time indicates a master at work.
BAlance
Stu


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s.
2007 HD883 Sportster. Bobbed and bettered.
1954 Royal Enfield 350 Bullet. Original.
    

141Back to top Go down    Re: K75kforkurz on Sat Mar 23, 2019 9:54 am

Woodie

Woodie
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 Can anyone see what's going off here?

You started re-framing the walls in your garage/shed/shop but then got distracted with "more important" things like customising K's?


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

142Back to top Go down    Re: K75kforkurz on Sat Mar 23, 2019 11:41 am

Laitch

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@chris846 wrote:Now then, back to something much more bizarre, in keeping with my normal theme. Can anyone see what's going off here?
A hybrid throttle body assembly.


__________________________________________________
1995 K75T 68,000 miles
    

143Back to top Go down    Re: K75kforkurz on Sat Mar 23, 2019 11:43 am

Dai

Dai
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Damn but I had to look at that for a while before it finally dawned on me.

Edit: Laitch got in a few seconds before I did.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

144Back to top Go down    Re: K75kforkurz on Sat Mar 23, 2019 12:09 pm

Laitch

Laitch
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robmack fabricated one for his retro K75. His was a converted K1100 assembly.



Last edited by Laitch on Sat Mar 23, 2019 10:56 pm; edited 2 times in total


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1995 K75T 68,000 miles
    

145Back to top Go down    Re: K75kforkurz on Sat Mar 23, 2019 12:25 pm

chris846

chris846
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Woodie got it!

Seriously (bad choice of word, I know) yep I nicked the cable quadrant and throttle cable bracket off some 1100 throttles, only reason is that the OE cable routing would foul the new airbox. Love playing with these Ks. Well spotted guys, happy to be in the company of such a tiny section of the population, who know and discuss these fantastically obscure things just as naturally as everyone else knows the days of the week.

Got a set of K1100 throttles lying around now...
And 3 (out of 4) K75 pistons that were unavoidably cheap on Ebay recently.
And a K100 that hasn't been standard since 1987.


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