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Author Topic: Carb overhaul, now running rich.  (Read 77 times)

Offline MikeFossl

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Carb overhaul, now running rich.
« on: December 25, 2021, 01:59:32 PM »
I did a complete carb cleanup and replaced all gaskets, o-rings and bellows.  Stats fine but having trouble getting an even idle.  Checked plugs and shows even coat of carbon.  Replaced plugs with new and after a couple of minutes at idle and a 5 min ride, the new plugs show another even coat of carbon.

Tried to adjust idle mixture but did very little.  Currently at 1 turn out.

Any suggestions?

Thanks,

Mike
1985 R65

Offline donbmw

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Re: Carb overhaul, now running rich.
« Reply #1 on: December 25, 2021, 02:41:58 PM »
Soak the carbs in cleaner again. Still have a passage stopped up.
1975 R90/6, 1980 R65, 1982 R65, 2015 Ural Patrol & 1959 Triumph TR3

Offline dogshome

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  • Posts: 116
Re: Carb overhaul, now running rich.
« Reply #2 on: December 25, 2021, 05:07:13 PM »
(1983)R65 idle screw start setting is 0.5 turns out. I have mine leaner than that with silent hektic ignition. 1 turn is far too rich. Check 1985 with your carb number here.

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肉(r?u)包(bāo)子(zi)打(dǎ)狗(gǒu) (meat+bun(2nd and 3rd)+hit+dog)
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Offline wilcom

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Re: Carb overhaul, now running rich.
« Reply #3 on: December 26, 2021, 12:30:57 AM »
If you are not getting adjustment when you turn the idle jets you have a passage fouled. Blow carb cleaner thru them till they all squirt cleanly. The attached animation is a good picture of what you're after. 

https://www.youtube.com/watch?v=wyspAHrMbb8
Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
1982 BMW R65LS 
past:
1979 R65
1980 R65
1982 R80RT
1974 R90/6
1972 R75
1964 R50/2
19xx R27
ZX-11

Offline MikeFossl

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  • Posts: 72
Re: Carb overhaul, now running rich.
« Reply #4 on: December 26, 2021, 11:21:16 AM »
(1983)R65 idle screw start setting is 0.5 turns out. I have mine leaner than that with silent hektic ignition. 1 turn is far too rich. Check 1985 with your carb number here.

This is likely the issue.  I was following a general airhead carb rebuild video.  Thanks for that resource.  Once the snow melts I'll clean the plugs, start at 1/2 turn and try again.

Thanks!
1985 R65