Oct 7, 2000
I have a 99 250 Exc. I'm planning on tearing the top end down to re-ring it and possibly put a piston in if need be.I have two questions. 1 About how long on average do KTMs get before they need rebuilt. I know it depends on use, conditions, etc. I maintain the bike very well but I do ride it hard when I ride.
And secondly has anyone tried a big bore kit or do they even make such a thing for the KTM.


Sponsoring Member
Dec 6, 2000
Frequency of rebuilds is the same as any other good bike. There are just too many factors to say you should rebuild after X number rides or X number of months. Checking compression and measuring componets are the only real way to tell when you should do it. I can say that if you haven't done at least the rings you should and I would be supprised if you don't need a new piston if you have 2 years on it.

As for the big bore I know Eric Gorr offers it with porting and everything ready to just bolt together for $375. His site has all the details.

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