JDMSPEED New Carburetor Replacement For Yamaha Raptor 660 660R YFM660 YFM 660R ATV Quad Carb 2001 2002 2003 2004 2005 Replaces 5LP-14900-00-00 5LP-14900-20-00 5LP-14900-30-00

Let me clear things up, all these bad reviews reflect user error. Apparently, they don't have basic knowledge on how carburetor works. When i installed it, had issue on acceleration, judger and missfire, but on full throttle it goes flying.The simple fix for that is simple, the floaters must be calibrated so the fuel reaches the pilot jets. In my case the floaters was a bit low, and the fuel not reaching the pilot jets nozzle. After couple of adjustment, it's so smooth, no missfire whatsoever, and i adjust the upper needle for the main jets and shifted the C clip to the last bottom position, by default it's on the position before last.So the people who are saying it's junk and they had to shift all the parts from the old one to the new and it worked, it's because the floaters already adjusted.Nice carb honestly, and highly recommended. Don't forget to adjust the floaters if you faced missfire or bad acceleration.