A Dynojet 138 is a Keihein (what you have) 150. Recommended for 3000 to 6000 feet. So if your at that range you may get away with it. But still need adjust the fuel screw. It's right on the side of the carb and easy to do.
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2004 YFZ450
Graydon Proline exhaust
Dinged Rim
Scratched Plastics
Custom blood stains
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