I am having problem with my WR400f 1998. It won´t start whit the kickstrarter. I towed it behind a car and it started but when i turned it of it wouldn´t start again whit the kickstarter. I guess it is the carburator which fails. Does anyone have a tip. Does anyone know what model the Keihin carburator is on a WR400F 1998? What carburator modell sits on the WR426 2000?