I've got a 2000 600XC SP with VES. It was backfiring badly thru the exhaust befor the clutch engaged (below 4000 RPM, with no load). I checked over the carbs and upon reassembly, I didn't get the TPS connector fully together. The sled ran great. I realized the connector was loose and plugged it in only to have the backfiring return the same as before. Wondering if anyone has ran into this or could point me in the right direction. Any help would be greatly appreciated.

ttt

Check the gap between the flipper and throttle block, should bo no more than about .030" . There are two micro switches in the block, one switch or the other need to be made all the time or the ign. will stutter. These are safety switches, in case of, ie: like a frozen throttle where they would be stuck open and wouldn't be able to shut her down. Just adj. cable to take up the slack and sync. with oil pump cable to get proper clearance.

Ran into the same issue on an 03 600 XC. Backfiring at idle and low rpms. Clears up with half choke applied. Also with TPS disconnected. Appears it was caused by bad fuel. Drained and replaced it. Had to adjust fuel screws to 4 turns open from 2 turns.

I recently read an article where those tps can be a problem. They are basicly a variable resistor or pot. that controls the voltage to the cdi to alter the timing. These tps can wear out...meaning dead spots are created within the resistor material inside them. This will cause lack of proper voltage or no voltage going to the cdi as the throttle opens which cons the motor into shutting down till it gets past the dead spot and runs normal again. Symtoms can be stumbling...bogging and even back firing. Doesn't mean every sled having these symtoms has a faulty tps, but something to keep aware of as you put more time on them.

My old 03 700 SKS would loose power after an hour run when the TPS was bad. When cold the TPS would change voltage properly. But after a one hour ride the TPS would not change voltage, 90 MPH wall. Polaris would not approve replacing any ign components while still under the two year warranty!!!

I found the TPS problem at my brother's shop, Polaris factory warranty Asssss Jason would not approve any repairs on my sled or the wife's Polaris while still under factory warranty!!!

Excellent dealer, so I tried Polaris one last time with 07 700 Dragon, now slow, loosing power, miss firing at high speeds after 38 mile runs, 82 MPH on a hard packed road with 1/2" fresh snow.
Last spring after re-flash it would hit 109 MPH on a 3/4 mile lake run.

DO TO Polaris factory warranty Asssss Jason the wife purchased an EXCELLENT 07 600 SDI Ski-Doo starts & runs far better then my 700 Dragon, also much faster, not back to Ski-Doo dealer once!!!
When the Dragon runs good, I love it, great handling, ride, wind protection much better then the slow XP's.
Good Luck; Rich