Hey, everybody! I hope I have come to the right forum for some help because I could really use it! For some time now I have been rebuilding the pistons on my buddies bike he had recently bought, a '93 XV535. He had brought it to me complaining of lack of compression, he had done some troubleshooting of his own and told me it was a cause of worn pistons rings. Taking his word on his diagnoses we had gotten to work tearing down the top half of the motor.
After waiting many moons to receive all new parts for the build it comes time to put the motor back together. However we are still waiting on the head gaskets as they re on back order. I decided to take the time to make sure the cams had been set with the proper timing for the rebuild.
Looking in the Haynes manual the cams should be aligned with the small punch mark on the sprocket aligned with a arrow in the cylinder head. However when I attempt to turn the cam to align the marks about every quarter turn of the sprocket causes the valves to push back on the cam spinning the cam to a position where the valve is closed. Throwing the marks out of alignment and loosening the cam bolt.