Question about 1979 Yamaha XS 650 SF

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Yamaha 650 special valve cover screw will not tighten

When tightening the valve cover it looks as though the area it the double sided screw sits is threaded on the engine side. The weird part is I can get it tight without the cover and new gasket but when I place them on, it just gets to a point then spins????? I am not sure how to fix this, I do not have a tool and die set. Oil leaks out of this area due to not getting the nut tight enough on the valve cover.
Thanks.

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It needs a ne thread [ helicoil]
or you can try machining doen the cover so the bolt goes down lower & use thread lock aswell
just get it to a point where it feels firm or youll end up pulling the thread again ok
Cheers Rob

Posted on Jul 20, 2009

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