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1Back to top Go down   K75C project - sort of runs. Empty K75C project - sort of runs. Fri Mar 10, 2023 12:57 am

Rockman

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I bought this 1987 K75C off a mate as a restoration project and for this year's Scrapheap Adventure Ride. Non-goer of course, in fact nothing worked but it would turn over if the starter solenoid was shorted across the terminals.

K75C project - sort of runs. P3070010
Nothing seemed to be too far wrong so I set about disconnecting and reconnecting things. This worked, it turns over, has lights etc and spark. Radiator has a pinhole but I've got another one coming so all good there.

Next step was to get it to run. New el-cheapo injectors from our friends in China ($48 for a set of 6). Still wont go. Sit and have a look for a while. Aha - spark plug leads are the wrong way around. Fix that and it goes - sort of. Its running on about 2 1/2 cylinders. No. 1 sort of backfires to the point that I can see flame around the intake where the arrow is on the photo below. The rubber is split which probably doesnt help. I'm wondering if the intake valve on this cylinder is sticking a little and not closing fully. It seems to run ok at around 2000-5000 but that might be an illusion. Any suggestions??
K75C project - sort of runs. 20230310

    

2Back to top Go down   K75C project - sort of runs. Empty Re: K75C project - sort of runs. Fri Mar 10, 2023 2:12 am

jbt

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Check valve clearance, normally it wears bery slowly but has to be adjusted every 100 000 kms...
It won't run smoothly if the intake rubbers are worn. Same thing for the S rubber pipe between intake and coils.


__________________________________________________
Let us enjoy the transient delight
That fills our fairest day.
    

3Back to top Go down   K75C project - sort of runs. Empty Re: K75C project - sort of runs. Fri Mar 10, 2023 2:47 am

Rockman

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I should have mentioned - it has 85k km on the odo. Based on the general condition, I'd say that's about right. The plan is to dismantle the thing and do a resto so many things will get fixed or adjusted as I go, including the valve clearances.

    

4Back to top Go down   K75C project - sort of runs. Empty Re: K75C project - sort of runs. Fri Mar 10, 2023 7:43 am

bad boy

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jbt wrote:It won't run smoothly if the intake rubbers are worn. Same thing for the S rubber pipe between intake and coils.
jbt, excellent suggestion.

Rockman, you might ask why?
Our bricks are ageing, regardless if you run them /high mileage/or let them standing in a barn /low mileage/.
So does the rubber.

After 35 years, it is not too bad an idea to replace all the rubber parts on the intake side.
Everything is still available /afaik/.
Good luck and lots of success


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Cheerz, David

K75C project - sort of runs. 9438-010

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1997 Peraves Super Ecomobile: a Kevlar reinforced monocoque with outrigger wheels, seating two.
K100 fork, monolever, headlight, indicators, K1100RS gearbox and K1200RS 589 engine, rear wheel
    

5Back to top Go down   K75C project - sort of runs. Empty Re: K75C project - sort of runs. Fri Mar 10, 2023 2:47 pm

charlie99

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Yet another one Phil   ? 

Good onya 
Hopefully will come together for you eh ?


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

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

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..

1987 k100rs ########   "Red"  - (red sports rs TWB style )
    

6Back to top Go down   K75C project - sort of runs. Empty Re: K75C project - sort of runs. Fri Mar 10, 2023 10:28 pm

Rockman

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charlie99 wrote:Yet another one Phil   ? 

Good onya 
Hopefully will come together for you eh ?
Yep, bad dose of K Pox as I've had over a dozen of them so far. This one will be ok in the end. Pull it apart, find out what isnt right, then put it back together. Simple..

    

7Back to top Go down   K75C project - sort of runs. Empty Re: K75C project - sort of runs. Sat Mar 11, 2023 12:22 am

duck

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It will never run right. You bought a bike that was designed and built in the northern hemisphere. The fuel molecules will always spin in the wrong direction (like your toilets) resulting in suboptimal performance. lol!


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

8Back to top Go down   K75C project - sort of runs. Empty Re: K75C project - sort of runs. Sat Mar 11, 2023 1:51 am

Rockman

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duck wrote:It will never run right. You bought a bike that was designed and built in the northern hemisphere. The fuel molecules will always spin in the wrong direction (like your toilets) resulting in suboptimal performance. lol!
I'll ride it backwards then Smile . That'll fix up those counterspinning molecules.

    

9Back to top Go down   K75C project - sort of runs. Empty Re: K75C project - sort of runs. Sat Mar 11, 2023 12:45 pm

duck

duck
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Rockman wrote:
duck wrote:It will never run right. You bought a bike that was designed and built in the northern hemisphere. The fuel molecules will always spin in the wrong direction (like your toilets) resulting in suboptimal performance. lol!
I'll ride it backwards then Smile . That'll fix up those counterspinning molecules.

Since you guys ride on the wrong side of the road that might help too. cheers


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

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