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Old 04-12-2012, 06:50 AM   #1
zenduddhist OP
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Right side rough running at cold '75 R90/6

Hi Folks,

I am getting an R90 up and running. When I get the back started, the right side kind of coughs and sputters until she is finally warmed up. It may take 5 minutes or so of idling and easy riding but finally, when it's ready, she runs pretty good without any of the sputtering. Can anyone give me some direction on where to start the troubleshooting?

Thanks much,

Chris McCarthy
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Old 04-12-2012, 07:14 AM   #2
Wirespokes
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The choke gasket would be my first guess. The choke housing screws are notorious for loosening and allowing the gasket to suck in. Once that happens, the choke doesn't suck anymore - and that's NOT a good thing.

Just tightening them back up isn't good enough once the gasket is deformed - at that point a new one is needed.

Or, it could be a plugged choke jet in the float bowl. Off in the corner of the bowl is a well with a small jet in the bottom. Make sure it's open and flows well.

Of course, the simplest may just be the choke isn't coming all the way on and the cable needs adjusting.
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Old 04-12-2012, 10:44 AM   #3
disston
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It is sometimes just the enrichner, chokes, gaskets and/or screws. Clean the pick up tube that hangs from carb main body into the float bowl and clean reservoir. But it also might be a good time to rebuild the rest of the carbs anyway. Since you will have them off check condition of the other O-rings at least. And check diaphragms. The rest of this stuff has nothing to do with the problem you mention but look at it at least.
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Old 04-15-2012, 04:54 AM   #4
Horsehockey
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If you have the time, swap your ignition wires left to right and see if the problem changes sides.
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Old 04-15-2012, 09:11 AM   #5
zenduddhist OP
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Where is the best place to get parts and/or rebuild kits for the Bing Carbs? I also noticed that one of the screws that holds the butterfly to the throttle arm is stripped so I need to get a new screw.
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Old 04-15-2012, 09:55 AM   #6
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Quote:
Originally Posted by zenduddhist View Post
Where is the best place to get parts and/or rebuild kits for the Bing Carbs? I also noticed that one of the screws that holds the butterfly to the throttle arm is stripped so I need to get a new screw.
Hans will take care of you:
http://www.bmwhucky.com/010013.html
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Old 04-16-2012, 10:34 AM   #7
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Bing parts

Bing International L.L.C.

1704 South 525 Road, Council Grove, KS 66846

Toll free 1-800-309-2464
http://www.bingcarburetor.com/aboutbing.html


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Old 04-16-2012, 11:59 AM   #8
disston
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Bing is usually not the best place to get Bing parts. They cost more than at a dealer. Hans would be a good choice. I don't know if he is cheaper than a dealer but he's cheaper than Bing. If you need certain rare items you usually have to get them at Big, the float needle seat is one rare item.
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