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Slight hesitation when whacking full throttle YZ125

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Hey guys I have an 08 YZ125 that has a strange hesitation when getting hard on the gas after a little bit of clutch. There's this 0.5s of lag with no revs before the power kicks in and when it does its like nothing has happened - revs don't build or or anything, just instantly back on the pipe. Sort of feels like something mechanical or spark related.

Anyone experienced this before?

Motor is stock, have a HGS pipe and Vforce reeds, running a JD jet kit and i feel the jetting is pretty good but perhaps a tad rich, most of the tracks I ride are sand based. 100h on the motor (not rebuilt yet) and 15h on the piston / rings. 

 

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