Hi, I just purchased a 1978 Honda 750four and there is a noise in the motor. It sounds to me that it is the timing chain(needing adjustment)There is 31,000 kms. on the engine. I was wondering if someone would be kind enough to tell me how to adjust my timing chain properly. I sent away for a manual but it won´t be here for over a week. The weather here in N.B., Canada is awesome, so I would like to be riding instead of having to keep it parked until I get the manual . Thanks for any help you might be able to pass on to me. Bill