RM250 98 rm 250 rebuild

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Casey holt

So I hve a rm 250 with a 3mm bore on it, and currently does not have a top end gasket. With that bore on my bike what size would that make it? And how would I get a head gasket for it. Any help would be aprreciated
 

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bobkyle2

bobkyle2

Which gasket... The cylinder base has a gasket.... But the head is sealed with O rings.... You can get a complete top end gasket kit from ebay.. That comes with the orings.. If you have the money i would get the OEM O-rings.



With a 3mm bore it would put it at 69.40
 
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Casey holt

Ok so oem orings and the piston won't effect the orings will it, and for some godly reason it isjust about impossible to kickstart, I have yet to kickstart it, it has a lot of compression, will those orings make some of that easier since there is just rubber sealer on the top end part
 
bobkyle2

bobkyle2

Oversize O-rings no... there all the same.


Your best bet is do a compression check.... Check reeds.... Did you just buy the bike? ... If its not been kick starting... how long has it been not starting off the kick starter.?
 
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Casey holt

It will start off the kicker its just really hard my 125 I could kick once or twice bujt the rm just has lot of pressure behind it maybe 5 hours riding on the new bore
 
Nighthawk016

Nighthawk016

Casey holt:
It will start off the kicker its just really hard my 125 I could kick once or twice bujt the rm just has lot of pressure behind it maybe 5 hours riding on the new bore
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RM250's are gonna be really hard to kick compared to a 125,they've been saying, there are no over sized o-rings for the head, there is only one size, and like they've been saying buy oem. 98 RM is a really good bike, the forks are amazing.
 
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