• 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.

which piston rings...

  • Thread starter Thread starter Johnny K
  • Start date Start date
J

Johnny K

Guest
I have an 82' 850GS. I need a new piston ring set for all 4 pistons. But every fiche I look at there is 2 different possible numbers with maybe a $5 difference and am not sure which one to choose. At flat-out on the crankshaft there are 2 numbers:
25-1 RING SET, PISTO 12140-45121 (replaces 12140-45120) $21.40

25-3 PISTON RING SET (STD) 12140-49001 $25.80

Which one do I go with. Thanks again for the help guys.
John.
2144_7.gif
 
i think you'll find some are oversize rings, just not that clearly indicated

why do you need them anyway, at 21k???
 
I had to do the top end because of the valve, head and base gaskets and when I got to the pistons they had a tiny bit of scorching towards the top around the edge. Not a lot, but just a tiny bit and the pistons are fine with no nics or anything. The rings looked worn so thats why i am replacing them
 
what is the difference between your part # and the other one that they list??
 
i had the same questions as you before my rebuild
the other numbers stand for "OverSized" rings but the parts fiche has (lots of) typing errors
should read:
OS1 - 0.5mm
OS2 - 1.0mm

but you may want to check with the place you'd be ordering from before purchase, just to make sure my memory's acurate 8-[
 
if you're not yet past this point (from your sig) "Prying the glued gaskets off of my covers." - there's a spray can with liquid that pretty much disolves any old gasket and makes it really easy to remove
good luck
 
lol. I already used a whole can and waited 10-15min between removing gaskets with a razor blade. I couldn't believe how much time it took me to remove the gaskets. I am just waiting for the rings and a spring valve compressor tool that my friend(mechanic) is getting to do the valves/seals. Thanks anyways though.
 
The part number you want is 12140-45121, the cheaper set.

The others are an oversize, 1mm I think. You won't need those for a couple hundred thousand miles.

The fiches are shot through with errors, so you definitely want to verify things that look shady like this.

For example, if you're ordering new cylinder studs, one of the part numbers on the 1980+ GS850 fiches is incorrect. The 1979 fiche has the correct numbers. (You don't need new studs, though.)
 
You must log in or register to reply here.
Back
Top