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Hello, i have a raptor 250R. I bought dyno jet and installed it how the stage 2 said. I have an stock airbox with k&n filter, and a fmf exauhst with a power bomb.
The problem is that the atv is running too rich, and it fails at high rpm.
The air mixture scew its how it was supposed to to the main jet i put.
I would be very glad if you could help me.
 

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What they give you is a starting point and needs to be adjusted per elevation, temp and a million other variables. I would call their tech support.
 
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