Technical Tech help needed- popping air out carb

better look one post up BEFORE you pull that cover...

 

Out of time or burnt valve usually causes one to shoot fire out of the carb. Well that or loading up (flooding).

With it having a problem turning over I would suggest that it is out of time. Perhaps it tossed a timing chain or gear. I would check the cam timing. A simple check that I have done a lot is to check the ignition timing then spin it and check again. More often than not of the timing chain/gears is bad the ignition timing will change from one checking to the next.

 

The drivers side has #6 the companion cylinder to #1 when it is at TDC exhaust #1 is at TDC compression. The valves moving put is at exhaust.