1998 arctic cat 500 stalls

[catman54]

1998 arctic cat 500 starts and runs fine for 20 minutes then idles very fast with slight backfire. Had this symptom the first six times but now the last two times it runs fine for 20 minutes then just runs rough and stalls. If you try to keep it running with some throttle it backfires bad. I have sprayed carb cleaner around engine and carb with no effect. Could it be electrical? stator? cdi box?

[Ajmboy]

Could be electrical after heat up, like that stator.

[BuckBilly]

Carb needs rebuilt. Suzuki power has some picky carbs.

[catman54]

Carb has been rebuilt and then taken apart and looked at again. With hunting season right around the corner I think some oldfashion parts swaping is next. Anyone know of an atv salvage yard that might have arctic cat electrical parts?

[TexasRapier]

Stator's usually don't act-up. They either work or they don't. However, the flywheels of that erea had glue on magnetics and over time the glue will release and the magnetic will move around on the flywheel.

This can be verified with a stator voltage out put test and a trigger test. But they are also usually not intermitant.

Coils can be effected by heat, a break in the windings that is closed when cool and opens when hot.

The first thing I would check is all the battery and engine grounds. Make sure there clean a tight. Make sure the main and aux fuses are clean and there plug-in are clean. Also check where thers harness connects to the start solinod. these is where the system draws power.

[Ajmboy]

Great info. Let us know how you make out!

[catman54]

I had come to the conclusion that my trouble was electrical so after checking/cleaning every connection I could find like had been suggested and testing as many electrical components as I could with still the same symptoms I went ahead and changed the cdi module and now it is back on the trail.

[TexasRapier]

Happy you found you problem, The CDI is the one thing that there is no real trouble shooting for. If you trouble shoot everything else and the all test good then it time to try a CDI.

Sence it appears your CDI was bad I do recommend you replace the voltage regulator. The CDI are solid state units with no moving parts and the only thing that damages them is voltage spikes.

The Stator put out 60 volt ac and the voltage regulator converts it to 14 to 16 volts dc. if it is internally shorted it can pass ac voltage to the CDI and damage it