Ok i have a 04 dvx 400 that seams to have a small issue it idels fine, but if you rev it up it sounds like the rev box is suck on, and if you ride it everytime you get on it ,, it falls flat on its face and usally dies.
Now since this problem has occured i have replaced the rev box, rebuilt the motor, brand new carb, with the dyno stage 1 and 2 in it, replased the plug, replaced the RFI and put an aftermarket exhust on. And it still does it!!!!! i have no idea what to do now and i really would not bring it to a shop, due to the fact the shops have forced me to replace everthing listed. So all in all ive spent way too much and still have the same problems. I need help any sugestions would be greatly apreciated. Thanks

 

I've owned an 08 dvx 400 for about 2 year, ride it almost every day and the only thing I've done to it is regular oil changes. 100% recommend this quad