Hey, just got a new(to me) 02 yz125 :yeehaw: and the guy said he had stage 3 porting done to the engine by Reactive. Along with fmf sst pipe and shorty silencer, rad valve, and runs on race gas.
First question. Whats the difference between stage 1,2 and 3 porting? Do they shave the head on one of the stages, and what about changing port heights and widths.
Second question. With all the porting, pipe and reed valve, this bike is meant for high rpm power, not low end. But even after the bike is all warmed up and stuff, when the bikes in neutral and idling, it has a small bog when I wack it open. Is this mearly a jetting issue, or is that kind of normal with all the mods.
Also, is there something else that I can do to it because its running on race gas? Since I'm paying for the expensive stuff, I mind as well use it to its potential.
Thanks
Jim