Question about Yamaha XS 500 Motorcycles

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Just rebilt a xs 500 yamaha motor the cams have been lined upwith the marks on the head and i keep bending intake valves what could be causing this?

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The valve guides will be doing this . you will have to make sure all those are replaced asthe twin cylinder has a lot of compression and bend valves . some times this is why your bike will be hard to start .
OR you have misalined the cam and went too far by a full turn as the piston is touching the valves .

Posted on Sep 26, 2009

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