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Well i just did a total rebuild on a 86 trx 250r. New hot rods crank all bearings/seals. I changed the carb to a 38 pwk airstryker. CEJ needle, middle clip 48 pilot, 165 main. 2-1/2 turns out on air/fuel. v force 3 reed. It runs ok in neutral idles fine. When i go WOT it bogs down badly if i hold it picks up then at the top of the powerband it seems i get detonation. At this point im so fustrated i dont know what to do next. Please give me some info. Thanks
 

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Send mindcrime a PM. The dude can tune the thing just by hearing it over the phone!
 

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did you perform a leak down test on it after the build? have you done a compression check since breakin? have you tried a wot plug chop to see if its rich or lean with the 165 main?
 
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