Sign in to follow this  
Followers 0
RideRaceLive123

on 01-07 RM250's can you reuse the oring head gaskets?

12 posts in this topic

Its never a good idea to reuse old o rings, however if your desperet to test something for a short period.

just check that the o ring is up for another quick session, roll the o ring between your fingers and you will feel if the o ring is still round in section or slightly egg shaped.

If it feels even slightly out of round, forget reusing it, if you think it passed that quick test, then check to see if it still sits naturaly in the o ring groove.

If it has expanded, forget it.

Share this post


Link to post
Share on other sites

lol I have reused them on YZs and RMs many of times and i never had a leak.

I do keep a spare set around and I check out the O-rings before sliding the head back on.

It seems the the outer O-ring tends to become larger after time and becomes hard to keep into the groove while sliding the head over the studs, at this point i replace that ring to save me hassle.

Share this post


Link to post
Share on other sites

How would you like used parts used in surgery, to just test something really quick? Buy the 2 dollar o-rings and save yourself the potential headaches. It would be like re-using a base gasket or any gasket for that matter.

Share this post


Link to post
Share on other sites

Can you reuse them? Sure. Is it a good idea? I wouldn't do it unless I absolutely had to. They deform from use and are cheap enough that I'd put a fresh one in each time the head is off.

Share this post


Link to post
Share on other sites

i reuse them all the time, no problems.

the only time ive found they need replacing is when you are getting a lot of detonation and the inner green one gets hammered.

Share this post


Link to post
Share on other sites

Yeah Bruce. If they worked on them enough they would know that replacing a good O-rings can add cost up over time. I just keep a set handy and reuse when I can. Never leaked after a positive inspection. And I ride the crap out of a bike.

Share this post


Link to post
Share on other sites

The head uses rubber o-rings.

Totally reusable, of course it’s not a good ideal to reuse the cylinder base gasket although it’s not impossible if it has not been used but for a moto or two.

Share this post


Link to post
Share on other sites

For 10 minutes?, yes.

But after that, plan on installing a new set. They really are not that expensive.

Share this post


Link to post
Share on other sites

More like 10 motos. Do you replace the rubber O-rings every time you remove your clutch cover too?

Listen the rubber O-ring is a simple unit that is not a moving part and while it does see heat, it sees only the running temperature (around 200F) unless detonation is present.

A used O-ring is just as good as a new one as long as the rings are not dry, torn, pitted, matted or swollen.

If I remember these seals are around 20 bucks a pair for OEM. Even thought this does not seem to be much it adds if you ride/race every weekend and do a rip down inspections every 7 weeks (including top ends)

Share this post


Link to post
Share on other sites
More like 10 motos. Do you replace the rubber O-rings every time you remove your clutch cover too?

Listen the rubber O-ring is a simple unit that is not a moving part and while it does see heat, it sees only the running temperature (around 200F) unless detonation is present.

A used O-ring is just as good as a new one as long as the rings are not dry, torn, pitted, matted or swollen.

If I remember these seals are around 20 bucks a pair for OEM. Even thought this does not seem to be much it adds if you ride/race every weekend and do a rip down inspections every 7 weeks (including top ends)

You've got a point, but also consider that the head does get a lot hotter than the clutch cover. So even though they are made for the extra heat, they do slowly loose their "cush".

And even at $20, I have to think that if your willing to tear the top end apart that often to ensure max power, an extra 20 bucks isn't a deal breaker.

~ my 2 cents.

1 person likes this

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0