I just purchased a Edlebrock pumper for my xr650r from thumpertalk store. I received the carb in three working days. It came with the manual and special instructions on the 650. I took it to the desert last weekend and the carb works great. After a few minor adjustments with the air/fuel mixture it was tuned just right. No more hesitation on acceleration. It also feels like it has more power. Now more flooding on the lay down either. Starts with one kick. It seems like a new bike and I am pleased with dealing with thumpertalks store and the carb. 2001 xr650r, uni filter,uncorked,big gun exhaust.