AllanCaveNZ
XS650 Member
Hey All,
I've got an engine that was rebuilt a few years back with 750 kit and a 277 rephase and then ended up having to store it for a couple years due to other priorities.
After changing the oil I did a compression test on it and one cylinder read low (90 psi) for maybe five or six tests then started to read normal (146psi on one cylinder then 150psi on the other) - if it does that again after sitting a few days is there anything I should look into?
Have checked valve clearance and will check cam chain tensioner, existing ignition is faulty and was a weird prototype the mechanic used instead of the pamco I supplied so just waiting on a tri-spark 277 ignition to turn up as they were nearby and looked good. I need to mark TDC as mechanic didn't when installing the PMA, using a piston stop do you just have to make sure it's on the power stroke to not risk hitting a valve with the piston stop? I presume left cylinder when sitting on the bike is considered the first cylinder on a rephase.
Thanks for the help, hope I'm not asking to repeat stuff from the tech section but wasn't anything obvious that answered those questions.
Cheers,
Allan
I've got an engine that was rebuilt a few years back with 750 kit and a 277 rephase and then ended up having to store it for a couple years due to other priorities.
After changing the oil I did a compression test on it and one cylinder read low (90 psi) for maybe five or six tests then started to read normal (146psi on one cylinder then 150psi on the other) - if it does that again after sitting a few days is there anything I should look into?
Have checked valve clearance and will check cam chain tensioner, existing ignition is faulty and was a weird prototype the mechanic used instead of the pamco I supplied so just waiting on a tri-spark 277 ignition to turn up as they were nearby and looked good. I need to mark TDC as mechanic didn't when installing the PMA, using a piston stop do you just have to make sure it's on the power stroke to not risk hitting a valve with the piston stop? I presume left cylinder when sitting on the bike is considered the first cylinder on a rephase.
Thanks for the help, hope I'm not asking to repeat stuff from the tech section but wasn't anything obvious that answered those questions.
Cheers,
Allan