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Gearing help

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I am running a 12 tooth on the transmission and a 50 tooth on the rear wheel on a 1.1 mile track it screams in 3rd gear but lugs in 4th it's a suzuki 250 2 stroke I am not sure if I need to go up or down in sprocket teeth any suggestions would be great

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what year RM is it?  usually 3rd & 4th are pretty close together. Whats' the plug colour like? 

 

Personally I'd stick a 13 on the front & try riding it, look at the jetting and do a compression check. 

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