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I turned the screws to one turn only. It started with choke and ran well for about 5 min and shut off. I checked spark - OK, plugs black but not wet. After a break and a few kicks it started and ran OK. No backfire, and carbs still on bike. I am using a temp gas tank (metal water bottle)...

Both are firing, however the right cylinder is hotter (approx 30 degrees). Took temp with infrared temp gun below plug. The bike runs good from cold for 5 to 10 minutes, then dies out. If I try to to restart hot, it back fires out the left carb and pops the carb out of the boot.

HI all, Bought 1st xs650 trying to get it road ready. It start easily cold (no choke) and idles well 1100 rpms, until warm and then shuts off. When I continue to kick it, it back fires out the left carb and pops the carb out of the boot. This has now happened twice in a row. Since I got it...