I am having some issues on a 2010 YZ450F that I recently had to install all new valve train and a top end on. The issue is when I set the cam timing up as per factory Yamaha specs using the correct timing marks, the exhaust valves are hitting the piston. Piston is in the correct direction,valve lash is good, flywheel key is not sheared so any other ideas? I have done tons od 03-09 yama 450's but this is the first 2010-2013 yama 450 I have done.
2010 YZ450F Timing Issues
Posted 23 November 2013 - 09:27 AM
The timing marks on the '10 are NOT at TDC. Go by the marks, not the piston position.
Posted 23 November 2013 - 02:37 PM
Posted 23 November 2013 - 04:41 PM
Unless you have the exhaust cam in the front of the engine, I can't think of anything.
Posted 23 November 2013 - 05:23 PM
Posted 12 December 2013 - 09:25 PM