Take off the tappet hole inspection cover behind the cylinder on top of the engine case. Remove the tappet hole inspection cover underneath the radiator in the front of the motor. Put a 17 mm socket on an extension with a breaker bar in the front hole and turn the motor over manually until the top dead center (TDC) mark for the number 1 cylinder appears in the other hole.behind the right cylinder is a gold 10 mm bolt coming out of the back of the block. Loosen it one turn and re tighten it. You have just adjusted your cam chain. If you ever have to take off the rear cover to replace the water pump seal and you just happen to have a cx650 self adjusting cam chain tensioner, it will fit right in so you can forget about adjusting your cam chain ever again.
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