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Message: <blockquote data-quote="OldWrench" data-source="post: 10917" data-attributes="member: 232">I have a couple of ideas. If oil was causing the fouling in that short a distance it would be smoking pretty bad. I’m going to make a guess that it is a fuel problem. I would start the bike up, let it run until it is warm and sitting on the center stand. I would then drain each carburetor into a container and measure the amount of fuel that comes out of each carb. Most likely you are going to get more fuel out of #1 than the other three. Assuming that your floats are adjusted properly I would then suspect that the needle valve is not seating properly and allowing fuel to continue to enter after the float should have shut it off. If you should find that #1 does have more fuel in it than the other three carbs I would buy a kit for it and replace the needle valve and seat or basically rebuild the carb. One thing about needle valves, it doesn’t take much at all for them not to seat properly. Sometimes you can look at them and they look perfectly good but then look at them under a strong magnifying glass and they look like the grand canyon. I’m going way back to my days of rebuilding carburetors on cars, funny thing is today we have young technicians that have never worked on a carburetor because everything is fuel injection. I seriously doubt that it is a weak spark but it is possible. You could swap the coils and that will tell you real quick if you have a weak spark or not. On my 83 the carbs were a real mess. I rebuilt them and set them up on the bench as has been stated. However mine took a lot of fooling with to get them synced right. However once they were done she purrs like a kitten and roars when needs to. Good luck hope this helps a little.</blockquote>

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