110cc - Wierd TDC Issue

Pitbike Tuner · Yesterday, 09:03 PM

Trying to get my engine to top dead center and have the 2 covers off. Issue is when turning counterclockwise and looking thru the top hole for the "t", whenever the engine gets to it it turns quickly past it and I cant get it to hold there. I had the spark plug out as its threads are stripped and I'm going to change the head to fix that issue, but even putting the sparkplug in it does the same.

Crossbar · Yesterday, 09:30 PM

At TDC both valves should be closed and there should be no spring pressure on the cam. If you're sure it's at TDC and not in between then could it have jumped timing or valve adjustment too tight? Did the engine run ok before? Find a way to lock it down at TDC and check the valve adjustment.

Yesterday, 09:03 PM	#1
Pitbike Tuner Join Date: Oct 2021 Posts: 5	110cc - Wierd TDC Issue Trying to get my engine to top dead center and have the 2 covers off. Issue is when turning counterclockwise and looking thru the top hole for the "t", whenever the engine gets to it it turns quickly past it and I cant get it to hold there. I had the spark plug out as its threads are stripped and I'm going to change the head to fix that issue, but even putting the sparkplug in it does the same. __________________ 2010 ZheJiang YX110cc ATV 2008 ZMC125r Pit Bike 2007 Viper Z32 (X15) Super Pocket Bike
	0

Yesterday, 09:30 PM	#2
Crossbar Join Date: Jun 2024 Posts: 85	At TDC both valves should be closed and there should be no spring pressure on the cam. If you're sure it's at TDC and not in between then could it have jumped timing or valve adjustment too tight? Did the engine run ok before? Find a way to lock it down at TDC and check the valve adjustment.
	0