1.) so when was the last time you cleaned the carbs?
2.) have you ever pulled the harness out from under the engine before to check it and place it in plastic convolute tubing to protect it?
Its only a matter of time before ALL of the proaction sleds have this issue, until they are repaired and placed in the tubing they will rub thru. The 02 srx has a little protector on the harness but it still can rub thru in front of the engine, been there and repaired that already. if you have never done it, its time to remove that from the equation, as its likely has rub marks or rubbed thru a couple wires and this starts, the ign. wire will arc to the frame and steal the power from the engine.
with as many miles as you have on it, its a good place to start looking!