peanut,
Do you have any inclination what could be causing the lack of pressure building in the kick? It's just a sloppy sponge on kick through.
Before I got it started for those two lovely seconds, it would build back pressure before I kicked through.
Thank you!
well the most likely reason for a sudden loss of compression is usually an exhaust valve not seating either due to being stuck or burnt or having the wrong ignition timing as per Jims suggestion (slipped cam chain) or the valve settings being set too tight as per 5twins suggestion.
if the motor has not been run in a while and all the lubricating oil has drained and the valve settings are tight, as they usually are on xs650 then an exhaust valve sticking and not seating is a distinct possibility .
I should ignore broken rings ....the likelihood of all of the rings suddenly breaking after 2 seconds running is extremely unlikely. .
Likewise cylinder bore scoring . That could never cause a catastrophic compression loss .
Gators suggestion of using a drill with socket adaptor is a good one and something I have used myself but you would need a drill capable of a slow start speed adjustment and if you fuc**d up the rotor nut you'd be in a world of woe. Far safer and effective to use the push bike method
lets start with the basics .
You need 3 things for an engine to run ............compression , a spark at the right time and a fuel and air mix close to 14:1 .
You have compression ( 80lbs would be sufficient to start and run the engine),
Do you have a spark at the plugs ?
Are the plugs getting wet with fuel ?