Valve Clearance Question - KawiForums - Kawasaki Motorcycle Forums
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post #1 of 5 (permalink) Old 07-21-2018, 08:15 PM Thread Starter
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Valve Clearance Question

Hey, I have a 2005 ZX-6R and the top end of my bike has been making a lot more noise lately (narrowed it down with a stethoscope). I know some people tend to focus on the CCT but it has ~18k miles so I figured the valves were a bit out of spec so I checked them.

My feeler gauge tends to jump by increments of .013 so I noted if the last gauge that fit was a loose fit but I couldn't get the next size in with a +

The intake spec is .11mm-.19mm. The measurements were:
1: .102mm+ .140mm
2: .127mm+ .178mm
3: .127mm .152mm+
4: .178mm .152mm+

Technically, only the left intake valve on cylinder 1 is out of spec but it's probably actually really close to the .11mm threshold. I was thinking of adjusting them all to .16mm to split the difference. That seem reasonable?

The exhaust results are a but more suspicious (I triple checked these and manged to get slightly better results the second time as these are a pain to measure):
1: .229mm .229mm
2: .229mm .229mm
3: .229mm .215mm
4: .203mm .215mm

The exhaust spec is .22mm to .31mm and these are all right on the border. These are all a little on the tight side and I was thinking of adjusting them towards .26mm?

I'd think that the gap would increase over time though right? It's weird that some are under spec.

Would tight (less clearance) or loose (more clearance) clearances cause the cams to make more noise? I'd think it would be looser ones.

ETA: Thinking about it, the valve springs would probably stretch over time so I guess it makes sense that the gap would decrease as a result

Last edited by hotsho111; 07-21-2018 at 08:19 PM.
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post #2 of 5 (permalink) Old 12-31-2018, 07:11 AM
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Generally the valves get tighter (smaller gap) as time goes on, especially the exhaust. But not always, I think it is best to adjust around the center of specs. Second choice to adjust a little loose. But I don't see how tight valves would create the noise your describing.

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post #3 of 5 (permalink) Old 12-31-2018, 08:54 AM
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Tighter, quite. Loose, loud.
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post #4 of 5 (permalink) Old 01-03-2019, 06:11 PM Thread Starter
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I did the adjustment (going a little loose where I didn't have a good fit), and I don't think it made much of a difference (maybe a tiny improvement) in terms of the sound. I probably just got a little paranoid, but at least that's done.
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post #5 of 5 (permalink) Old 07-21-2019, 01:58 AM
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if it is the cct you could use the back out method and see if the noise goes away. Kawis are kind of known for a little rattle on the 636.

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