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jetting a wr450 with a DEP pipe

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HI..

just bought a DEP pipe for my 2005 model WR450F and am having a crazy hard time trying to jet the thing. I think i've tried every possible needle and needle position in the book. I had a look at the 2004 model wr450f and i was like &%$#@! there are hardly any needle positions in the 2005 model. so........ does anyone know how to jet the wr450f with a DEP pipe? any help would be greatly appreciated...

thanks

ceps

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Sorry... in all my whinging i forgot to write what was wrong with it. It pops more than a popcorn maker does. I sit on about 60km/hr in 3rd and the thing goes nuts, i then put it into 4th which does the trick but then when i get to about 75km/hr it starts popping again. also when i change gears it backfires, sounds like a fuel/oxygen mismatch to me. but ahh what do I know? can anyone help??

thanks

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