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What Jets recomended for 01 YZ144?

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I just installed a new Athena 144 kit on my 01 YZ125. The jets I took out are 22.5 pilot, and 450 main. I installed a 35 pilot and a 480 main. The motor stumbles before it hits power band and in beginning of power band. I expected some drop off on the top end, but I'm dissapointed with the bottom and midrange. I'm hoping its a carb issue. Any help would be appreciated.

The weather has been between 50-60 degrees when riding. Also using 50/50 mix of U4.4 and 93 octane (98-99octane) with yamalube 2R.

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Don't know about the Athena kit, but if your jetting was correct before the kit (as a 125), you should not have to change very much. Sometimes you go leaner, not richer with the bigbore. Basically, it probably should run pretty well with the same as 125 jetting.

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Thanks Ralphtogo. You might be right. I put in a 27.5 pilot last night and got my midrange back, but bottom end still sucks. I might end up going back to what it was originally.

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