I tried to tune my TRX450r by changing standard jets and needles and never got it right. Installed this kit and the quad carburated perfect on the first try!!! Great kit would recommend it to anyone. Also Dynojet customer service is FANTASTIC!!!! Five stars to motosport and Dynojet.
Moose Dynojet Jet Kit - Stage 2
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Easy to install, has held up to rough riding, no issues at all.
Used the jet kit on a TRX-450 with a big bore kit and slip on pipe. Followed the instructions and the machine carburated perfectly the first time. Good product..
Main Jet: 116, 120, 124, 128, 132, 136, 140
Just installing a larger bore replacement piston is NOT considered a modified engine. I would suggest the STAGE 1 kit for you.