QuestionI have a 1985 Yamaha 700cc Maxim. When I back off the throttle to shift the RPMs go up instead of down. I thoroughly cleaned the carbs and examined all related mechanisms-nothing. The RPMs eventually come down but it is hard on the transmission as it needs that micromoment of no gear pressure to shift quietly. There is an adjusting screw on top of the carb. Will turning that help?
AnswerTom,
-make sure the throttle cable has a small
amount of free play or slack.
The adjusters are near the end of the cables
near the carbs.
-The idle adjust screw is underneath and in
the middle of the 4 carbs. It is a kind of
star shaped wheel near the rear. Just go
two carbs in and it should be there.
Turn it anti-clockwise to slow the idle.
-The screws on the top of your carbs
are for synchronizing the carbs,
better not to touch them unless you
have a carb synching gauge. This
makes all the carbs pull equally.
You may need to have this checked out.
-Check for sticky carb slides.
-If this doesn't help, I suspect you have
an air leak on your intake somewhere.
It might be a loose carb or some
other vaccuum leak. You can try
spraying some wd40 or carb cleaner
around the carbs to see if it speeds
the engine up. Look for any loose hoses
or air noise.
