• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Valve to piston clearance / squish height after milling head gasket surface

  • Thread starter Thread starter boris.h
  • Start date Start date
B

boris.h

Guest
Hey all
Just made this morning a first assembling of the gs 650 head on my bike.

I measured the squish band clearance, and the valves to piston distance, with a classical method (brass 2mm thick part)...

squish band clearance: 1mm (0.04")
intake valve / piston distance: 1.7mm (0.07")
exhaust valve / piston distance: more than 2mm (0.08")

The surface is already milled, so I could use the head as it is now, but if there is some margin it's the moment to mill again the gasket surface... What do you think about that? Are these figures ok or is there some margin again?

thanks
 
You are fine. I set stuff up tighter than that if I am the one using it & KNOW it won't get abused. Are all of these measurements taken with the head gasket in place?
Ray.
 
Yep measurements made with new gasket in place but the screws are note couple tighten so I think it will be a little closer. Do you think that I can mill my head again? I thought milling 0.2mm more...
 
According to lots of discussions, I removed 0.2mm more. This would increase the CR to 9.9 / 10:1.. decreasing valves to piston clearance to 1.5mm for intake and 1.9mm for exhaust...
 
You must log in or register to reply here.

Similar threads

G
Measuring squish band and deck height
2
Replies
35
Views
3K
boontonmike
boontonmike
Chuck78
head/base gasket thickness selection? overhaul; seized piston removal?
Replies
5
Views
310
blowerbike
blowerbike
T
Help: Setting Deck Height... For Dummies
Replies
5
Views
635
trippivot
trippivot
49er
GS 850 Piston Options
Replies
4
Views
528
49er
49er
49er
GS 850G ...Head gasket, valve or ring job ?
Replies
3
Views
412
49er
49er
Back
Top