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help plz (07 yz250f or 450

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hi8 i just got a bike it had yz450f sticker on it but ive ridden one b4 and this one doesnt seem as powerful, how do i tell if its a 250 or 450? it also doesnt start first kick takes 10-15 b4 it starts, it also backfires wen i let off throttle. i dont really know anything about bikes, any info would be much apreciated TY

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its an 07, i dont know where the water pump is. but are u talking about the hoses that connect from the radiator to the engine? there is a steel pipe that can be un bolted connected to those hoses.

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