I replaced a blown 400 with a good 350 in my girlfriends 99 Scrambler. I haven't been able to get it to run properly. The oil injection is blocked off,runnin 40:1 mixed gas now. Coil in new, start switch, battery, Solenoid an ignition switch all new. Idles fine, bogs under throttle. I've cleaned carb, replaced the fuel lines flushed the tank an cleaned filer screens. Adjusting air/fuel screw has little effect. Not sure if I should go up a jet size or what. Always seems to be something goin wrong or not quite right with this thing. Ive got way to much money in it for it to work so shitty