My best guess is the cam chain tensioner is acting up because it was installed incorrectly. When removing the tensioner, keep in mind the tensioner applies tension on the rear run of the cam chain. First take off the right engine cover and with a 19mm wrench, rotate the engine clockwise until you feel compression resistance. This will give you tension on the front run of the cam chain and the rear run will be slack. The tensioner should be removed and installed with the engine in this condition. Next, lock the set screw down on the tensioner plunger. This keeps the plunger from possibly springing out and going into the engine. Now remove the mounting bolts on the tensioner and remove it. Next, unlock the tensioner plunger set screw to allow the tensioner to move back and forth. If it moves freely and smoothly with good spring pressure, the tensioner is fine. If it doesn't move freely, clean it up until it does. Once its OK, press the plunger into the tensioner housing with your hand and lock it down with the set screw in the fully retracted position. Reinstall the tensioner on the engine. Turn the set screw counterclockwise to unlock the tensioner so it will spring in to put pressure on the rear/slack run of the cam chain. back the tensioner screw out a turn or two so there is NO contact between the set screw and the plunger. Lock the set screw in the no contact position with the jam nut. The spring maintains the proper adjustment automatically. The most common mistake is having the engine in the wrong position and/or locking the plunger down.
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