brobones
09-01-2021, 09:26 AM
Hi to all, any info on this would be appreciated.
I recently removed my motor out of the bike. Replaced parts on the top end that did not meet specs. Got the had the valve seats redone and a new exhaust valve. New guides and seals. Cam shaft, rockers wrist pin were all in very good shape. Replaced the piston rings, the piston bore was still in good shape and honed it. Was .004 big still within the specs. Cam sprocket was in good shape along with the chain.
Assembled the top end as required with the manual TDC markings on the flywheel.
Put the motor back in hooked everything back up. Checked for spark, good compression. All was good could not get it to fire. I have had the bike for 12 years and I have no idea of its history before that sounded like several owners. Since I have owned it I change the oil regular twice a year.
I then put a plastic rod down the spark plug hole only to find out the markings on the flywheel are 180 degrees out. Someone either installed the flywheel wrong or replaced the original flywheel with one that is not for this bike. I thought the flywheels were keyed and could only go on one direction.
Trying to get the cam lined up properly was a nightmare. Still runs a bit rough WIP.
Any thoughts on this would be appreciated. We were able to get it timed close by finding the compression stroke and then bolting the cam sprocket...
I recently removed my motor out of the bike. Replaced parts on the top end that did not meet specs. Got the had the valve seats redone and a new exhaust valve. New guides and seals. Cam shaft, rockers wrist pin were all in very good shape. Replaced the piston rings, the piston bore was still in good shape and honed it. Was .004 big still within the specs. Cam sprocket was in good shape along with the chain.
Assembled the top end as required with the manual TDC markings on the flywheel.
Put the motor back in hooked everything back up. Checked for spark, good compression. All was good could not get it to fire. I have had the bike for 12 years and I have no idea of its history before that sounded like several owners. Since I have owned it I change the oil regular twice a year.
I then put a plastic rod down the spark plug hole only to find out the markings on the flywheel are 180 degrees out. Someone either installed the flywheel wrong or replaced the original flywheel with one that is not for this bike. I thought the flywheels were keyed and could only go on one direction.
Trying to get the cam lined up properly was a nightmare. Still runs a bit rough WIP.
Any thoughts on this would be appreciated. We were able to get it timed close by finding the compression stroke and then bolting the cam sprocket...