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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Mark Newton, Mexican camping

I haven't been everywhere...
but it's on my list!


Photo by Mark Newton,
Camping in the Mexican desert



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Old 21 Aug 2008
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86 tenere non starter

Hi , trying to do a gasket change ive had to put head cover back on with 2 sheared bolts and one thread rung on another , would this cause loss of decompression for starting or should i look at spark and fuel ?cheers jerry.
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Old 26 Aug 2008
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no it would not

Hi.

No it wount effect compression ( I asume this is what you mean?) But It´s not good for your camshaft and cylinder head that you have put the cover on with shreaded threads. If you look at how the camshaft is seated in the top of the head you will understand why.
If your cover is not tightend properly(shuld be thightend with a tourque wrench) the shaft might not get enough oil,and it will vibrate in the seats. This will damage the "bearing" surfice and then you will be looking at replaceing the whole top end.
Take it off again and get the threads fixed with a Helicoil or similar.
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