S1 Publishing(Oxford)© 2009

World of motorcycleS
S1 Publishing(Oxford)© 2009
Dogdragons Yamaha XS 650 Engine photo's - Page 3
 If you are about to do your own maintenance, using these pages, I take no responsibility if you get things wrong!
Click here to go back to page 2
Cam chain guide. worn out after about 27years.There is a very good possability that the camchain tension had been incorrectly adjusted somewhere in it's past. I know that when I removed the tensioner, it was in the correct position.
Other wear and damage
  Lower oil filter, blown. Due to blackage. The blockage seems to be worn out ground down plastic, probably from the cam chain guide. 
Cam chain. well will last another year, but I'd replace it if given the chance.
Oil feed pipe
Rockers: I noticed (by eys and feel) that the exhaust rocker had had bad flat spots. These were caused by lack of lubrication and over tightening of the tappets (no gap at all). The lubrication problem was caused by gasket sealant or a silical sealant. The four corner studs had worn rubbers under the head nuts, so they probaly started to leak, I can guess that the person who last rebuilt this head had just used the sealant to stop the leak.
 Either way, the flat spots have now been re-contoured, and should run. When I turned the engine by hand there was no more knocking.
 If youwant to know how to remove the rockers from this model, click here:
 rocker_removal
Click Here for the rebuild
If you are about to do your own maintenance, using these pages, I take no responsibility if you get things wrong!

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