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I race an 04 yzf250 and i was wondering if anyone has any free performance tips like cutting out the backfire screen on the airfilter cage or stuff like that. Thanks in advance.

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I think cutting a bigger hole in the top of your aqir box will give you a lot mor power out of the starting gate! 😢 It worked for me even know I don't race 😢

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I think cutting a bigger hole in the top of your aqir box will give you a lot mor power out of the starting gate! 😢 It worked for me even know I don't race 😢

I dont think that post was remotely close to being helpful. The YZ doesnt have a lid to the airbox like the wr does. I pulled the stock backfire screen and put in a 125 air filter cage, no wires to worry about coming loose or poking you. Plan on jetting the main a step richer. You could make yourself a home made verson of the powernow,..although i bought one. Suffer from a bog?..Try blocking off the leak jet or ordering a smaller leak jet. Blue wire mod. Actually the best place to check out is.....www.thumperfaq.com That is the hook up.

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