Question about 1999 Yamaha YZF-R6
I lapped the valves on my yamaha and tested to see if it seated good so I sprayed some carb cleaner down the ports and 4 out the the 20 valves did not leak but the four of them did. Is that going to be ok or should I lapp them in a few more times to see if I can get them to not leak through. I heard you are not supposed to lapp titanium or hardened valves but I don't think these are hardened. Thanks
There should bo no leakage from the valves, do you have a grey line all the way around the seat and the valve with no black pit marks if so this should be fine also when the valves and springs are in then turn the head upside down and fill the combustion chambers with petrol wait a few moments and shine a torch up the inlet and exhaust tracts there should be no seepage.
Hope this helps
Posted on Apr 25, 2010
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Posted on Jan 02, 2017
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