How important is adjusting the Vavles? - KawiForums - Kawasaki Motorcycle Forums
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post #1 of 14 (permalink) Old 02-16-2010, 04:04 PM Thread Starter
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How important is adjusting the Vavles?

My bike has 12,500 Kms on it now (07 ZZR) and according to my maintenance manual its time to adjust the valve clearance. I cant afford to take it to a shop up here where they could possibly F it up and not take any responsibility for it. That would be over $500 in Canada for that work.

I've finally got the tools required to do the job myself in the last months of winter here but why fix what isnt broken? Anyone got good or bad experiences with adjusting their valves? Are the benefits greater than the potential risks of opening the engine?
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post #2 of 14 (permalink) Old 02-16-2010, 04:14 PM
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It's not a required "valve adjustment" per se. It's a required "valve check". YOU can easily (errr not too difficultly) check your valves. IF any of them are out of spec THEN you can take it in for the $$$ adjustment or debate doing it yourself. The key is to check them first.

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post #3 of 14 (permalink) Old 02-16-2010, 04:29 PM
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ZX-6R Maintenance: Adjust Valve Clearances - McWiki

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post #4 of 14 (permalink) Old 02-16-2010, 04:37 PM
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What is that in miles about 7,000?
Some might tell you its not important but I don't buy into that, I say it is.
I pay a professional to do mine, But he only charges me $150. (thank goodness)
Iv had em done 3 times, First at the shop ($400+) last two at Bub's cycle shop,
He has been building drag bikes for over 20 years. I trust this guy.

First time (at the shop) they said they were not out, that was at 8,051 miles.
I'm not sure they even looked at them.
Each time Bub did them at 18,694 & 26,490 miles they were out.
The bike ran noticeably better after each time.

About doing it your self? If your mechanically inclined & have a place to work
you should be able to do it.
Get a shop manual take notes & document every thing you do.

Remember don let any trash however small get into the engine or onto the parts.

just my two cents worth good luck.



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Will need to practice with it often."

Last edited by Maness1220; 02-16-2010 at 04:42 PM.
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post #5 of 14 (permalink) Old 02-16-2010, 04:43 PM Thread Starter
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Quote:
Originally Posted by WildCard View Post
Ive seen that write up and its excellent yeah, Thanks I was thinking more if the Valves were out of spec when I do check them, What the hell do I gain from putting them back into spec?
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post #6 of 14 (permalink) Old 02-16-2010, 04:44 PM Thread Starter
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Quote:
Originally Posted by Maness1220 View Post
What is that in miles about 7,000?
Some might tell you its not important but I don't buy into that, I say it is.
I pay a professional to do mine, But he only charges me $150. (thank goodness)
Iv had em done 3 times, First at the shop ($400+) last two at Bub's cycle shop,
He has been building drag bikes for over 20 years. I trust this guy.

First time (at the shop) they said they were not out, that was at 8,051 miles.
I'm not sure they even looked at them.
Each time Bub did them at 18,694 & 26,490 miles they were out.
The bike ran noticeably better after each time.

About doing it your self? If your mechanically inclined & have a place to work
you should be able to do it.
Get a shop manual take notes & document every thing you do.

Remember don let any trash however small get into the engine or onto the parts.

just my two cents worth good luck.

Thanks Bro!
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post #7 of 14 (permalink) Old 02-16-2010, 04:49 PM
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If there out a lot & you fix em, you will feel it. its going to run better.
There's lots of benefits to keeping the valves in spec



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Will need to practice with it often."
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post #8 of 14 (permalink) Old 02-16-2010, 06:31 PM
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A couple things you need to know before ruining your investment:

1) Valve clearance periodic adjustment is the MOST important maintenance procedure to keep the engine from destroying itself. Failure to do so will result in SIGNIFICANT engine damage and premature failure that is going to cost more than doing every valve adjustment in the usable service life of the bike combined.

2) Improper valve adjustment can cause/lead to catastrophic failure or damage. Many things can go wrong: You can improperly seat a keeper and suck a valve, break a rocker (in tappet type valvetrains) Over torque a cam cap bolt, ect. ect.

3) Valve clearance on follower type valvetrains requires precision measuring equipment wich can be expensive i.e. micrometer, calipers, plasti-gauge, model specific special tools, shims, ect.

4) Once an adjustment is complete, a carb/throttle body sync will need to be performed as the volumetric efficiency of each affected cylinder has changed. This require a vacuum synchronization tool. (More equipment=more $)

Cliffs: Yeah, periodic valve adjustments are pretty F'ing important!
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post #9 of 14 (permalink) Old 02-17-2010, 02:19 AM
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just reading how to do the work and thats a shit load to do and if you stuff something up you gotta pull it apart again and start again.. Id just ring around a few places and get them to do it then its covered buy the bike shop and they can fix it
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post #10 of 14 (permalink) Old 02-17-2010, 04:07 PM
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As said before, It's very important bike maintenance and you should let a bike handle it.

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