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Cam chain skip?

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Look here for common issues and FAQS. Found at the top of the YZ450F threadline.


Towards the bottom of the link, you will find a source for factory manuals. Find one that fits you and read it thoroughly.


As for your marks.... the intake does look to be a little off but so does the exhaust (ever so slightly) where is the crank mark? its possible you have the whole assembly rolled just a bit too far. As I'm sure you've surmised, the marks should be level with the top of the head with the crank mark lined up. Any issues with it starting difficult? running funny? I feel like even if you rolled the intake back a tooth it might bring the mark back too far. Which might indicate a worn and stretched chain. I replaced my timing components on my 06 about a year ago when i replaced the piston. Just for piece of mind more or less. But there wasn't any evidence of stretching. The motor has an auto tensioner so as long as its in good working order (springs when released and has tension)  you should be ok. 

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