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trx450r jetting help please

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i just got a 2004 trx450r i put a hmf slipon a uni filter and changed the main jet to 180 acording to hmf thats what goes. i have a off idol stumble or flat spot. so when you jump on the gas it falls on its face then comes to life.

i have the air screw out 2.5 and i have tried puting the clip to #4 down stock is 3 can you help please :) thanks

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I took off the air box lid and I had the same problem as you do. I went to a 190 main jet and it runs good. If you still have the problem after that then up size main jet x2 until it runs good.

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