Help On Quad

[CraigI]

Looking for some help, my son races a Dinli Diamond Back 50, flat track, We did head work, 28mm carb, tuned pipe, clutch work, some jug work. When he is on the line, it bogs off the line then opens up. I have a 118 main jet in it, the plug is good color, " coco color". Any help to get the bog out would be great.
Craig

[TWIZDdirtRIDER]

tune the carb, and make sure you have the rite spark plug.

happened to me. newer blasters take a BR8es, my 96' takes a B8es. the BR8ES will make mine bog