Running Lean...

[marioc89]

Well first off this is my time to this site and I hope y'all could help me on a few issues. I have a 1981 XS400 and it runs great other than sometimes when after coming to a stop after doing some riding, it tends to idle high sometimes and at times it doesn't. I'm trying to figure out why is it doing that and what can I do about it. Does that mean I may be getting too much air in the intake?

 

[marioc89]

Any ideas y'all?

 

[Inked Monkey]

Mine was doing that and it turned out the clamps on the carb mounts were a little loose.

 

[marioc89]

SO, it could be that it's taking in too much air huh?

 

[angus67]

tighten those clamps, but more likely, the carb boots are cracked, and occasionally open up. or the butterfly shafts on the carbs are letting by unmetered air. hope its just the boots, bud.
If it usually does it once its warmed up, its prolly the boots. when they get hot, they get soft.

 

[marioc89]

One more thing. What if one of the exhaust pipes have a small hole in it around the clamps, do you think that'll do it too?

 

[angus67]

man-made hole? or a rust hole?

 

[marioc89]

rust hole...