Valves beyond adjustment, heads coming off. -
Engine Tech This forum will be dedicated for internal Engine threads , discussions, upgrades etc etc

LinkBack Thread Tools
post #1 of 1 (permalink) Old 05-17-2017, 07:57 PM Thread Starter
AMA Supersport Racer
Join Date: Apr 2011
Location: Phx
Posts: 966
Thanks: 10
Thanked 199 Times in 174 Posts
Feedback Score: 0 reviews
Valves beyond adjustment, heads coming off.

I haven't seen this before, but I guess not many go enough miles. Last time I checked valves [63,000 miles], cylinders #2 and #3 intake valves were very tight. Being my first time adjusting, I thought it was my technique. I could get the feeler inserted but it took some effort. I put some smaller shims in but not small enough. Fast foward to now, just over 82,000 miles and I'm doing them again. Again, I find just those valves tight, can't get any feeler gauge in with any effort. So I check and calculate the other valves, then install everything except I put no shims on the #2+3 intakes so I can figure out what I am working with. Turns out, those 4 valves are way off, no shim goes small enough to compensate. That should mean my valve seats for those intakes are gone, and need new seats machined in. So the head has to come off.
The crazy part is the other 12 valves are all wearing pretty evenly and slowly, with the exhaust valves all wearing exactly the same each time they are checked. So yes, keep up on your valve checks. If you aren't sure, get another opinion. Might have saved me some hassle if I had.

'06 F4i- Yoshimura RS-3C, Racetech springs and valves, Ohlin's rear shock, steel brake lines, 520 conversion. 87k miles and counting.....
'08 600RR- Stripped trackbike. CRG shorty brake lever, goodridge front brake lines
'15 1000RR- weekend toy
------Disclaimer: I can't spell------
bored&stroked is offline  
The Following 2 Users Say Thank You to bored&stroked For This Useful Post:
498cm3 (08-27-2017), tary preisser (05-17-2017)
Sponsored Links

Quick Reply

Register Now

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

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


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

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

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