[cbesing]

Hi, I just installed the BBR rev box and the bike ran real bad. A lot of popping off idle and through the mid throttle. Before the rev box, I was running a powercore 4 pipe and a main jet of 102.5. No other mods.

I moved the needle one click leaner and that helped some.

Does anyone know if the rev box mod by itself would require jeeting changes? If so, what kind?

Thanks, Chris

[crfsonly]

cbesing...welcome to the group. if you were running stock jetting you would likely want to go richer not leaner.

ken

[oldtimer]

I think you went the wrong way. I would richen it up buy raising the needle (lowering the clip position) and move the fuel screw out in half turn increments to make it richer. The poping is usually a lean sign…
Your running a 102 main and stock pilot. That is not much bigger than the stock 98 main. Is there a higher flow air filter in it or stock?

[oldtimer]

Doh! Ken beat me to it!

[cbesing]

Thanks for the info. THe only mods before the rev box were the 102 jet and the powercore 4 exhaust. No mods to the air box of filter. The reason I went leaner on the needle is first i went one click richer but the plug went totally black and the problem didnt get better so I went the other way.

[2005 crf]

hey i was wondering what a rev box does