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Valve clearances 2002 600E Valve clearances 2002 600E
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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.
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  #1  
Old 9 Aug 2009
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Quote:
Originally Posted by aukeboss View Post
The gauge should go through not too easily, not too stiffly, as we say in Dutch it should go through 'sucking'.
That's a very good description! I was taught that it should be a 'firm sliding fit' - a bit like drawing a knife through butter. It's one of things that you just get the 'feel' with practice.
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Old 20 Mar 2010
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The 1990 version 1 manual says 0.05-0.1 for inlet.

I have a question though, will the gap increase over time or get tighter?

Will the engine feel better/run better on the smallest gap possible 0.05 then a higher gap? So if the clearance increases over time the closer to 0.05 you can get when setting it the better?
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Old 20 Mar 2010
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valves are a bit of a weird one when it comes to wear some wear tight and some open up :confused1: i always set mine to the bigger gap if it opens up its no problem i'd rather have a slack valve clearance than risk it going to tight and burning the vave seats

bergspre the engine runs fine at either end of the gap/clearances it wont make any difference in performance, these engines are not race motors where the the tollerences are so precise that valve timing is affected by a 0.05 increase in clearance.
in fact the xt motor would probably cope with a 1mm clearance, it would be noisey but would still start and run ok.
i set mine to a lot larger gap than it should be when i rebuilt the engine just to allow everything to bed in, once its been run a few times from a re build all engines should be inspected bolts re torqued and clearances reset so it was no extra work
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Old 20 Mar 2010
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Usually lock nut & tappet engines tend to loosen up over time, but not always.
Bucket & shim engines always tighten up, as valve seat wear is faster than the cam/shims wear.
As Wolfy says, I'd aim for the higher tolerance (bigger gap) - then check again after a few 100 miles for peace of mind.
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