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02 RM 250 upgrades and diagnosis

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So I picked up this 02 RM 250 for my son. He is 6'-2" 160lbs. Knows how to ride and wants to get a little more out of the bike. Only because my bikes are all done up. Anyways we put a FMF Fatty and Vforce reed on it. And added one more tooth in the back. Went from riding well to riding great. So one year later we send it in to the local motor guy to get it ported. He calls us and says that the 02 cylinder are horrible for porting. And they chew threw pistons. Not a complete motor nut but the guy sounded like he new what he was talking about and is friends with the local dealer that I am good friends with so I left it alone. This is a great bike and it is really hard for me to get rid of such a great bike (and I enjoy talking mess Hondas are better. No suzikis r better blah blah) so I was wondering if anybody else has had the same problem and if there was any fixes. Even if we bought a new cylinder and then took it to get ported. And does anyone know why this cylinder is bad? Thanks

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