well, back a few weeks ago i started my sled (the carbs were drained over the summer..stored indoors) and it would not start on its own, but if i blew into the vent lines on the carbs, i could hear this bubbling sound and the sled would fire right away...only thing was it would rev right up to clutch engagement and start to pull away....So once it warmed up the idle died down a bit, bla bla...took it for a ride and it just fell on its face..no power, no nothing. One plug was white (overheated)...I thought I had cooked my engine, but thankfully it was a faulty compression tester!!..I have OK compression both sides . I took off the carbs, blew out all the passages with compressed air & carb cleaner (but the carb was clean...not a spec of dirt anywhere because it was drained...I cleaned it out anyway) Checked the carb boots for cracks, put the carbs on and installed the airbox. Same thing....it will fire up but rev really high and I have to jog the kill switch. I replaced all the fuel lines and the pulser line, the gas flow from the fuel pump was pretty good (primed right up when i pulled it over a few times)....What am i missing, this thing ran primo last summer? how high are the slides supposed to be at closed throttle? Mine are about 1/2 to 3/4 inch..they are synced....I'm lost!!