Has anyone heard of a rev-limiter on Polaris sleds. I have a 93 Indy 500 EFI that won't rev above 4000 rpm, and backfires both through the intake and exhaust - timing problem??. It is one of 3 EFI Polaris' that I own, so I have worked through all the usual problems. I just picked this sled up a couple of months ago. The previous owner had the engine rebuilt at a Polaris dealer due to a bad crankcase seal. I have all the recipts. The dealer broke the flywheel upon removal (the dealer confirmed this), and replaced it (at the previous owners cost). Here is my delima - I took the sled back to the dealer that serviced it to see if they had installed the correct flywheel, set the timing properly, failed to install the woodruff key for the flywheel, or if the crank had become out of true. After over two patient weeks, the dealer informed me that it was not anything that they had done, but the throttle safety switch was broken. This, they claim, will allow the sled to idle, but will limit the rpm as a safety feature. I thought the safety switch on the throttle was to kill the engine in the event fo a stuck throttle. I may be misinformed, but I'd like to know for sure. $171.00 to replace the switches in the throttle seems a little steep to me, considering a new throttle assembly (aftermarket) costs $35.00, and they charged me near $50.00 for the switches. If anyone can help - let me know.