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post #1 of (permalink) Old 01-03-2001, 02:10 AM
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Indy 650 timing problems

I am relatively new to snowmobiling and need some help with my sled. I have a 1992 Indy 650 that recently started to backfire and miss when I would lightly accelerate after cruising or decelerating, especially on the low end, often with loud explosions as if fuel/air is igniting in the exhaust pipe (it has also become really hard to start and easy to flood). I have went through the carbs many times and have basically came to the conclusion that my timing is off, seeing how all pistons are backfiring and the compression looks good an all of them. When the backfiring is not occurring my spark plugs appear to have the correct color to them also. I have also checked all of the wiring, ignition leads, spark plug boots, kill switches, etc. and have found no problems (I have not yet tried replacing the CDI). The problem has progressed to the point that it is backfiring frequently and fouling plugs within several minutes. Also during this time my headlights have become dimmer and recently I lost all of my lights, tach, and accessories. I have checked the wiring with my multimeter and I think I have traced down the electrical failure to my stator coils. I am wondering if the stator coil could effect my CDI and spark timing (the sled still runs without any lights, but still backfires)? Also if the magnets on the flywheel ever become bad. I would appreciate it if anybody has a idea of maybe what my problem is.

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post #2 of (permalink) Old 01-03-2001, 09:34 PM
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Re: Indy 650 timing problems

your CDI is bad it acts just like the points in an engine your triple cylinder polaris doesnt have mechanical type breaker points the stopped putting those in sleds many moons ago

post #3 of (permalink) Old 01-04-2001, 08:21 AM
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Re: Indy 650 timing problems

Trav78 the backfiring sounds like you have too much play in your throttle cable. There are 2 little kill switches built into the throttle block so if your throttle cable sticks it will kill the machine. As far as the lights go did you check your voltage regulator? If it is the voltage regulator it is a quick and easy fix. Good luck Riley

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