im am trying to get more power for my wifes 440 ex and thought that the quicksilver carb sounded like a good way to go .what is the deal with the ad claiming that( no jetting is required)?.if anyone has used this set up i would like to hear your opinion on how it performs and if the no jetting claim is true.

The Quiksilver uses an old carb design. If I were you, i'd opt for a Lectron or FCR like shaneb said. If you can find a stock CRF450 carb for cheap, buy it.

Last year they had a carb shoot out for the 440 the FCR just made a little more HP than the QS but the QS made more torque and torque moves you. The QS is easy to adjust and is a simple design that works. If it is not broke why fix it.

HERE is some more info on the QS carb.

FCR all the way. Look at Factory race teams. All the four strokes in MX and road racing run FCR's. In fact the FCR was orignially designed just for the Suzuki race team for their crotch rockets. The Edelbrock uses the same system as their automotive carbs. Don't think you just bolt it on and go. You stil have tuning to do. I have spent many hours tuning Holley (jets) and Edelbrock (metering rods) carbs. I will take a carb that uses jets any day. The FCR is an intricate piece that is unbeatable if you take the time to tune it.

This quick silver carb looks sweet, and they even have one for a warrior but I cant find a price anywhere, only part numbers? how much these jokers cost?

If its a 440 dont go with a quicksilver their only made for a stock bore and stroke its not big enough for a 440. my freinds got one on his quad it adds alot of top end. but the rod to they accelerator pump is junk in cold whether it tends to bend. you might be able to bore youre stock carb out ????