Quote:
Originally Posted by otc 
edit: and I am having some troubles with my right cylinder...I think it is firing but maybe not strongly. Bike will stay at idle if I pull off the right plug, but dies immediately if I pull off the left. Left exhaust pipe also heats up much faster. Compression was fine last time I checked but that plug is always a little dirty...I don't really want to rebuild it and it sounds like new rings might be hard to find.

edit: and I am having some troubles with my right cylinder...I think it is firing but maybe not strongly. Bike will stay at idle if I pull off the right plug, but dies immediately if I pull off the left. Left exhaust pipe also heats up much faster. Compression was fine last time I checked but that plug is always a little dirty...I don't really want to rebuild it and it sounds like new rings might be hard to find.
Did you pull the plug(s) when the motor is hot or cold? Does it rev smooth?
I would check your coil for a good ground and hot lead. Change the plugs and check the gap, look for breaks in the spark plug wire, etc. Start small.
Are the 400's single or dual carb'd?

















