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1990 yamaha moto 4 250 Back fireing

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I just bought a 1990 Yamaha Moto 4 250 and a 1986 Honda Fourtrax 350 4x4. The Yamaha back fires on declaration and when giving it a handful of gas. It also fouls the plug with oil and once it warms up it cant stay on with out the choke on. Sometimes when warm it takes a while to start up so i wait to cool down. Has a brand new battery. Any help would be useful. I haven't checked the carb yet.

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