I appreciate the info. My kid's Yamaha racing quad had an FCR39 and once I got it setup correctly it started and ran great even in the winter months. There is a company called JD jetting that makes excellent products for the FCR when used on the Yamaha quad. Also installed a little thing called a "quick shot" which boosts the fuel volume from the accelerator pump when you whack the throttle. Works great on the modified quad but would probably be way overkill on our bikes.
