Valve Clearance Question - KawiForums - Kawasaki Motorcycle Forums
 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 07-21-2018, 08:15 PM Thread Starter
Jr. Member
 
Join Date: Aug 2009
Location: Fairhaven, MA/Mill Valley, CA
Posts: 78
 
Send a message via AIM to hotsho111
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.
hotsho111 is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 12-31-2018, 07:11 AM
bpe
Member
 
bpe's Avatar
 
Join Date: Dec 2018
Location: Atlanta,GA
Posts: 423
   
Garage
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.

2006 EX500r
Purchased new in July 2006, 0 miles.
Miles as of January 2019 102,137 miles
bpe is offline  
post #3 of 5 (permalink) Old 12-31-2018, 08:54 AM
Jr. Member
 
Join Date: Nov 2018
Posts: 14
 
Tighter, quite. Loose, loud.
Crutches is offline  
 
post #4 of 5 (permalink) Old 01-03-2019, 06:11 PM Thread Starter
Jr. Member
 
Join Date: Aug 2009
Location: Fairhaven, MA/Mill Valley, CA
Posts: 78
 
Send a message via AIM to hotsho111
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.
hotsho111 is offline  
post #5 of 5 (permalink) Old 07-21-2019, 01:58 AM
Member
 
KentuckyKawi's Avatar
 
Join Date: Jul 2010
Location: Jeffersonville IN
Posts: 230
     
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.

Yes We Have Shoes In Kentucky... We Also Have Motorcycles.

-KentuckyKawi
KentuckyKawi is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the KawiForums - Kawasaki Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome