SOURCE: how do i adjust timing chain on a yamaha 650 seca?
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.
SOURCE: How do you adjust timing
Most bikes u have to take all apart for the timing...they should not be out of time unless someone put it together wrong
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