ok my buddy has a 98 warrior. fried bottom end last yr piston was smackin an everything. lol ok but he had sent the hole quad in the shop n got the hole motor rebuilt bottom end top valves carb cleaned yata yata. no when he first got it back it ran allright not the best i noticed the header pipe was cherry red hot. the intake boot between carb n motor had got a hole in it some how but it was brand new got replaced when he got motor rebuilt. so he replaced that, but now heres the problem, it starts right up no problem idles kinda high then makes like a pop noise by the intake boot n idles down n sputters till it dies. n when he gets on it WOT it sputters bad to. and then the started buttom quit workin but i can start it by jumpin the sylinoid but i dont think that would cus anything with why its running how it is. im personly a 2 stroke guy so dont know much bout these 4 stroke motors if anybody has an idea what could be wrong with it let me know tyhat would be sweet. thanks