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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Ttr250 rebuild advice
Post Info TOPIC: Ttr250 rebuild advice
Ttr250mark


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Ttr250 rebuild advice
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Hi everybody!

Longtime lurker, first time poster here. What a great resource for us owners. 

 

Chasing some advice before I strip down my ttr. I have a leaking base gasket that needs replacing. The breather isn't blocked, engine is not blowing smoke or have any other symptoms that would indicate other problems. 

 

Just wondering if when tearing down I can replace gaskets, rings,valve stem seals and call it good? Anything else I should consider doing? New piston? Timing chain? Etc. . .

 

It's a 2007 with 10,000kms

 

Thanks guys. 



-- Edited by Ttr250mark on Thursday 4th of July 2019 04:17:56 AM

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petenz


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to replace rings you need to hone the bore or the new rings will
not lap in....



...

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Bikes... 06 TTR250 / 09 XT660R / 1977 Montesa Cota 348 MRR / 1979 Montesa H6 125 Enduro...

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Ttr250mark


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Thanks for that. I'll definitely be honing the bore.

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leigh


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For what it's worth, I re did my base gasket at around 20,000k's.

New base gasket, head gasket and standard rings and put it all back together. Was a quick job (heading away on a big trip no time for full rebuild as seemed relatively ok) and went well for another 5-10,000klm before the bike was written off. Didn't hone the bore or clean up the valves etc. 

I've still got it for parts and notice the base gasket is weeping again from the same spot. Next time sealant as well.

ttr250.activeboard.com/t63637721/leaking-base-gasket-should-i-be-excited-or-disappointed/


Cheers Leigh.



-- Edited by leigh on Thursday 4th of July 2019 07:33:04 AM

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Ttr250mark


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Thanks for that info Leigh. Great link also. I'm hoping I can do similar to you if everything else looks ok once I get inside the motor.

Cheers

Mark

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ttboof


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Mines never leaked but rebuilt it with a wosner piston when a freak gearbox failure at about 65k kms made me pull it down 

Easy job great result 



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Ttr250mark


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Thanks for the advice ttboof. That's an impressive amount of kms!

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ttboof


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Ttr250mark wrote:

Thanks for the advice ttboof. That's an impressive amount of kms!

 About average for my bikes  I like to get out and ride .most local rides here cover a fair distance  a couple of biked have seen the 100k mark 

Regular maintenance and regular use and it's OK 

 

I notice total KS vary around the world  as well as the climates and locations  one of the best things about the forum I recon 



-- Edited by ttboof on Thursday 4th of July 2019 10:30:59 AM

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