Indy classic 500 bogs down after 10-15miles of riding - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 13 (permalink) Old 02-26-2019, 12:32 PM Thread Starter
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Indy classic 500 bogs down after 10-15miles of riding

Hello everyone. I recently was up in rockwood Maine riding my 94 classic 500. Ran great for a few days. On the third day, after about 10-15 miles of riding it would start to bog down and the engine would die. Where I live I don't really get a chance to ride that kind of distance so I have never had it happen. On the side of the trail (15 miles from ANYTHING) we popped the hood, saw some carbon tracking on the left cylinder plug so I changed both. Ran it about another 10 miles and it happened again. After it died we would try to start it a few minutes after and with one shot of starting fluid it fired right up and idled and ran fine.
I thought maybe a fuel issue but the fact that it fires right up and runs without feathering or choking leads me to believe otherwise. Tank vent is clear and I even unscrewed the gas cap as it was happening to rule vacuum build up out. Compression on both cylinders is good. I haven't checked resistance on the cdi yet but I'm assuming if it was bad in order to get a poor reading I'd have to ride until it heats up and dies. Any thoughts from anyone? Anyone had a similar issue.
I also can confirm that the clutch is releasing like it should and not hanging up causing the motor to bog. Any help would be greatly appreciated. I hate issues that come and go, I'd rather it just be broke😁. It makes me nervous to ride farther than I should with this issue
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post #2 of 13 (permalink) Old 02-26-2019, 01:31 PM
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About the only test for a CDI is to swap it out with a known working one...


You can test the stator and the coils to make sure those are within spec. A lot of times, an engine issue that occurs only when the engine is warm and resolves when it cools is one of those two. When it dies, do you have spark?

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post #3 of 13 (permalink) Old 02-26-2019, 03:08 PM Thread Starter
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When it died we opened the cover and checked for spark almost immediately and we did have it. I hate to just throw parts at it, those are almost the two most expensive parts on the sled. I do have another cdi I can try.
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post #4 of 13 (permalink) Old 02-26-2019, 03:09 PM Thread Starter
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Also, we started it back up within 5 min and I drove it for another 10 miles before it happened again.
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post #5 of 13 (permalink) Old 02-26-2019, 06:59 PM
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Were the plugs wet or dry? That may help guide you too.



I'm with you, I would just as soon something BREAK and be done with it so a person can find it! And electrical issues are the worst... sigh.

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post #6 of 13 (permalink) Old 02-26-2019, 09:13 PM
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Change the external coil!
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post #7 of 13 (permalink) Old 02-27-2019, 06:10 AM Thread Starter
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I will try that, I have a cdi off of a 87 Indy but the plug on those models was reversed. I'll find a way to make it a female and give it a shot.
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post #8 of 13 (permalink) Old 02-27-2019, 07:01 AM
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Dont! just take a coil that works from anything else and try it first!
Messing around with a CDI will just mess up both?

If a CDI goes bad it just wont spark at all!
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post #9 of 13 (permalink) Old 02-27-2019, 12:19 PM Thread Starter
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The older Indy coil is the only one I have. I was going to change that coil to fit my sled not the other way around, then if that's not the issue I cut the right end off the sled😮 I can just use some stekons and wire to change it over for now and see. Then I can get the right cdi for it if that's it.
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post #10 of 13 (permalink) Old 02-27-2019, 08:35 PM
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Coil is fine but dont rewire the CDI!
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post #11 of 13 (permalink) Old 02-28-2019, 06:00 AM Thread Starter
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When I say coil I am referring to the cdi, that's what it is, it's a capacitor discharge ignition. The stator is housed behind the pull start that sends a pulse to the cdi, which uses that pulse to build a high voltage spark. I guess I should probably refer to it as a cdi. Usually we refer to single ignition items as coils. The only two parts that make a spark on a sled are the pulser winding of the stator and the cdi box.
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post #12 of 13 (permalink) Old 02-28-2019, 06:53 AM
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No the only thing that Makes spark is the external COIL!

Just for me find another Coil (from anything) with the Spark plug wires and just try it!
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post #13 of 13 (permalink) Old 03-05-2019, 09:37 PM
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May sound crazy, but I experienced similar issue with a nonpolaris belt after it warmed up, lost power at low end and bogged down. Thought same things on fuel or spark until a Polaris repair shop off the trail sold me a new belt. Hoping you solved it.
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