westonboege
XS650 Addict
Sounds like youve isolated the left cylinder. Do what some have suggested, and perform a compression test. I suspect either compression loss... to o tight of a valve causing it to hang open possibly? I would think that if it was losing enough compression to not run at all, you should feel that cylinder to be much weaker when kicking the bike over. Even slowly kicking it, I would think it would be a noticeable difference from the stronger running right cylinder...
The other possibility is the carb is dumping too much fuel in. But you said you had ruled that out by swapping carbs?
The other possibility is the carb is dumping too much fuel in. But you said you had ruled that out by swapping carbs?