just picked up a 2001 raptor 660 yesterday

has a few aftermarket parts like 686 big bore kit stage 2 hot cams and yoshimura exhaust

bike will idle perfect and you can give it a few jabs on the throttle and its still fine when you put it in gear and take off you might get 20 feet and it falls on its face looses all power then let out on the gas and it will be fine for another 20 feet lol bike doesn't back fire or shut off and the plug isn't soaked although it is black.

all brand new 91 oct gas new plug cleaned the carbs etc still no difference can someone help me out. Im at sea level

bike just seems like it looses its gas to me can any one give me a good jet spec to start with and i can go from there?

Thanks