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Discussion Starter · #1 ·
YZ125 is not running well. The engine is 100% re-built; new crank, all new bearings and seals as well as the transmission bearings/seals. New OEM cylinder, "B" piston and cylinder. Using new Boyesen RadValve. Carb has been cleaned and installed new OEM jets. Mikuni TMX36

It has a lack of pep, no zip when cracking the throttle open.

Let me know if anyone has any thoughts here.

Thanks,
Doug
Tire Wheel Land vehicle Fuel tank Vehicle
 
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