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On the back of the cylinders is the cam chain tensioner. Find the timing marks for the motor and set the motor to top dead center (TDC) on the compression stroke for the #1 cylinder. Piston up, both valves loose (not pressing on valves). Now loosen the bolt on top off the tensioner and tighten it back up. You have just adjusted your cam chain tensioner.
Line the (i) mark on the fly wheel to the inspection mark on the inspection plug hole then with both intake and exhaust cam lobes facing outward of the head aline the dots on the cams as best as possible to the top of the head it wont a line perfectly but will be pretty close - the timing on just about all YZ four strokes is exactly the same they all use this set up to install cams
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