BMW K bikes (Bricks)

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Dai

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This all started after the crash; prior to that the engine was running perfectly with no nasty noises to upset me. What I've done:

Re-checked the clutch adjustment
Changed the spark plugs
Changed the HT leads. When I came to check the No.1 Realm Engineering lead I found the connector a nice colourful shade of green with a matching coil post to go with it. On peeling back the rubber cover to clean the HT connector, the HT connector fell out. Shall we say the crimp wasn't as good as it could have been, especially when compared to the other three. LFB now has BMW leads in from Brick 2. That reduced the diesel injection slightly.
Checked ALL of the FICU and ICU connectors and wiring (I built it, so...)
Changed the ICU
Changed the FICU
Checked the throttle bodies for balance and synchronicity.

Starting is... a bit odd. It almost instantly fires on all four pots but within a second or two the diesel knock kicks in quite loudly. Pulling the clutch in reduces the noise marginally, as you'd expect when the gearbox is decoupled. Give it a handful and hold it at about 1500rpm for ten-fifteen seconds, drop it back to idle and the diesel knock reduces to almost inaudibility. Leave it for a minute or three, the knock disappears and tickover settles to between 960 and 980 rpm.

BUT.

It feels like someone has removed half a cylinder. I struggled to get LFB above 95mph on the M1 back from Dublin on Sunday and in general, kicking it down into third to overtake feels more like just opening the throttle up in fifth gear. Opening it up in fifth gear to overtake is inviting the nearest hearse to pay a visit. Either way, giving it a handful induces a low-level diesel knock again (could possibly be an intermittent misfire, I guess. Difficult to be absolutely certain over the wind noise).

Anybody any guesses as to what I've shaken loose? What I haven't checked because I keep forgetting is our old friend the rubber pipe between the airbox and the plenum chamber.


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'83 K100 upgraded to K100RS spec
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'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)
    

92KK 84WW Olaf


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Damage to an injector? Crap disturbed in the fuel line ending up in an injector? Bad injector on a diesel engine makes a fierce knock. Electrical checks won't show it up.


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 83,150miles
    

charlie99

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sounds about right to me
pull the fuel rail and have a look


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

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

Dai

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Sounds about the only remaining possibility. Now I'm forced to think about it, the crap could have originated in the fuel pump?


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'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)
    

charlie99

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unlikely ...it goes through a filter before leaving the tank ...more like high pressure line deteriorating internally ..... at least 30 r9 fuel line .. and 30 r 10 for internal to the filter etc

also test the fpr while your doing that stuff ?

you might want new filters on the injectors ...so a kit might be the go

good luck


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

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

Basic2

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Maybe a faulty coil.


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Marakesh Red
    

92KK 84WW Olaf


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A nice reminder...of when I changed my fuel lines one of them was mighty perished on the INSIDE. Check out 'the hard to get at' one because the return line if its perished the crud ends up in the bottom of the tank....but the supply side ends up in the Fuel Pressure regulator and in the injectors. Even taking the tank on and off can leave the end of the fuel line less than perfect.


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 83,150miles
    

Dai

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Not a coil. I should have listed coil change under 'what I've done' but I forgot. The external fuel lines are barely a year old (one is perhaps four weeks old) and are designed for fuel injection systems, but that doesn't stop any of them from having crap in them where it shouldn't be. Internally, they are one-year-old OEM.

I have a spare fpr if I need it. I'm not too keen on teeing in a pressure gauge but I will keep it in mind. Meanwhile, new injector kit seems to be the next step. I can always rob the injectors off Brick2 if needed.


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'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)
    

charlie99

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best place to tee In might be the line to the fpr ....at the back of the rail ?

its not too hard to get at
but thinking that through ...new lines ...hmm could this be an injector electrical connection ?


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

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

Dai

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Injector overhaul bits just ordered from Motorworks. They agree with you guys who diagnosed injector crud.

Charlie - I pulled the injector connectors to check them as no.4 has a habit of corroding one pin. They were all clean.

[Edit] Realm Engineering have just told me that they'll replace my no.1 HT lead FOC. Good on them.


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'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)
    

RicK G

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Check the linkages on the Throttle bodies one may have come loose and be lagging.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

Dai

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They were all tight Rick. The balance gauges showed no.1 pulling a couple of inches of Hg more than the others, so I corrected it. I know all four were near-perfect, so I suspect the sudden discrepancy appeared when I removed the faulty Realm Engineering HT lead and that let the cylinder start pulling properly. Well, I guess that rules out the forward pot as the site of the trouble anyway.


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'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)
    

charlie99

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any news dai ?


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

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

Dai

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Perhaps later today or tomorrow, Charlie. I took a nasty throat infection last week which in turn fired off a secondary infection in my lungs - apparently it's pretty common around here at the moment. Elizabeth banned me from the garage but in truth, I had no energy to argue even if I'd wanted to. I've been sleeping between ten and and twelve hours a day - does the word 'dormouse' mean anything? Probably not in Ozland! Very Happy


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'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)
    

Chocolate

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So all The best Dai!

Hopefully you are back on your bike soon and healthy.
That's you now ;-)



Cheers


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Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
Pictures:Me my bike and I
    

charlie99

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@Dai wrote:Perhaps later today or tomorrow, Charlie. I took a nasty throat infection last week which in turn fired off a secondary infection in my lungs - apparently it's pretty common around here at the moment. Elizabeth banned me from the garage but in truth, I had no energy to argue even if I'd wanted to. I've been sleeping between ten and and twelve hours a day - does the word 'dormouse' mean anything? Probably not in Ozland! Very Happy

know what you mean dai ...suffered similar last year

get well soon ol mate


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

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

Dai

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I went for the cheat route and I'm about halfway down it now. I pulled the injectors from Brick2 and ran around 15cc of carb cleaner through each one while under pressure from a syringe. Having a wife on nursing staff at the local hospital has occasional bonuses. Each injector produced a good squirt around two feet long when activated for about half a second, so I'm reasonably confident they're in good condition. I derusted them and treated them to a thin coat of Hammerite while I was at it. Guess I'll find out tomorrow if the problem is a fuel injector, but I'm sorely tempted just to change the fpr while I'm in that general area.


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'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)
    

K75cster

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@Dai wrote:Perhaps later today or tomorrow, Charlie. I took a nasty throat infection last week which in turn fired off a secondary infection in my lungs - apparently it's pretty common around here at the moment. Elizabeth banned me from the garage but in truth, I had no energy to argue even if I'd wanted to. I've been sleeping between ten and and twelve hours a day - does the word 'dormouse' mean anything? Probably not in Ozland! Very Happy

Actually a Geraldine Maguire used to run a comedyscript, in the 80's,her husband was referred to as Horizontal,So maybeyou can use that one from Ozland,Dai.

A couple of inches of HG is going to sound like true chugger?


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

Dai

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Any noise caused by that sudden imbalance in Hg was pretty well disguised by the primary source of the problem.


__________________________________________________
'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)
    

Dai

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B*st*ard no.3 fuel injector! Once I'd pulled the injectors from LFB, no.3 showed a distinct discoloration on the tip compared to the others. I stuck in the overhauled ones from Brick2 and hit the button. One puddle of fuel later it occurred to me that I'd forgotten to put the top clips back on...Rolling Eyes Try again... and on a cold engine with no choke it idled at about 700rpm (charging light just flickering) without the hint of a knock! Smile Smile

The only thing that worried me - and something I couldn't do anything about - is that despite very careful cleaning some grit did get into the injector ports. I can only pray that it got blown out without doing any damage.


__________________________________________________
'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)
    

charlie99

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well sounds like you found it dai

good work

wonder now, if the hammering I was hearing on old gerty a bit more than a year ago, was the same issue

the valve parts certainly werent the issue.

cheers


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

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

Dai

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Had to sneak out and start it again, just to hear it run properly!!!

Guess I'll need to recheck the throttlebody balance now - tomorrow maybe.


__________________________________________________
'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)
    

Brad-Man

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Good news Dai!



Last edited by Brad-Man on Tue Feb 23, 2016 8:44 am; edited 1 time in total


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92KK 84WW Olaf


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Nice one Dai. That's what the forum is for. Good to see you have it sorted.


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 83,150miles
    

Dai

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Did a 'fan test' and checked the throttlebodies - no.4 needed just a small tweak at idle - it was 40mm Hg out compared to the other three who all agreed with each other. At 3000rpm the difference across all four was about 5mm Hg and I couldn't be bothered to try and tune out such a tiny amount. It's probably just relief but I swear the engine has never sounded so good!!!


__________________________________________________
'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)
    

Chocolate

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Well done Dai!

Pictures from you job would nice.
Have a good ride!

Cheers


__________________________________________________
Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
Pictures:Me my bike and I
    

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