i have a 10 mm walbro i will sell for $20. if you are wanting your cag or piston port bike to go much better, for those who don,t know about these carbs they have fully adjustable low speed and high speed settings, so you are able to tune your engine to maximum revs for both accelleration and top speed. the stock carbs do not allow this tuning. this walbro is in perfect working order.[sold to a happy customer]