Valve Clearance Philosophy - Page 2 - Kawasaki
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post #11 of 23 Old 12-12-2006, 12:17 AM
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Middle to loose

Middle to loose is best IMHO. Tight is not best because it's critically important that the exhaust valve seats fully to allow for heat dissipation into the cylinder head. Hard to believe but if the exhaust valve is too tight when the motor is running hot(full operation temp.)it will not fully seat properly and the result could be a burnt exhaust valve. That's why it,s sometimes normal for racing engines to have valve train clicking noise at low speed to be sure the valve face has that precious time to contact the valve seat and dissipate some of the 3400 degree combustion temp. A motor runs and sounds like crap with a burnt valve so I don't think it's worth the risk to go tight. A burnt valve sounds like an exhaust leak,without the exhaust leak:headshake
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post #12 of 23 Old 12-13-2006, 06:30 AM Thread Starter
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Thanks for the feedback, everyone. I've always adjusted at the looser end of the range, but thought it might make for some interesting opinions. Time to get to work this weekend...
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post #13 of 23 Old 01-03-2007, 06:13 PM
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while installing a high flow air filter i thought i would take a look down the throttle bodies with a flash light. i saw that what i believe is the valve had a black ring around the outside of the valve base seated end ???? is it o.k. 2400 miles 06
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post #14 of 23 Old 01-03-2007, 10:39 PM
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post #15 of 23 Old 01-04-2007, 06:47 AM
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That is carbon build up. Somethin' like BG 44K or runnin' Chevron gas will get rid of it.
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post #16 of 23 Old 01-04-2007, 11:28 AM
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carbon build up

cool thanx,
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post #17 of 23 Old 09-11-2017, 06:31 AM
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Originally Posted by Dukester View Post
If you set them to the loosest spec you will loose some top end and pick up some mid range.

If you set them to the tightest spec you will trade some mid range for top end.

If you want to go with either of the two extremes exactly you will need to make some shims in custom sizes.
Is there a benefit / difference performance wise for being exact like setting all 16 valve clearances to the exact same number? Say for example 0.20mm for all and not settle for 0.19 or 0.21?
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post #18 of 23 Old 09-11-2017, 07:31 AM
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closer to loose.

2004 ZX10R-few mods here and there......
and even made more Evil by Woolich.
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post #19 of 23 Old 09-11-2017, 08:25 AM
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The valve clearance with the run of the kilometers, get every day thigter, because the valve gets into the cylinder head.
So it is better to have them closer to loose limit than have it closer to tight limit.

My opinion is to have them from the middle, to the closer limit.
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post #20 of 23 Old 09-11-2017, 08:31 AM
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2016 zx10r Racekit manual recommends 0.20mm on both intake and exhaust.
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