My kid has a Polaris Sportsman 90, he ran it in some high water over the weekend and stalled it out. I could not get it started on the trails, the motor would turn over but not start. Got it home and took out the spark plug and turned it a few times, replaced plug, still no start. Went to bed, tried the next day and engine will not even turn over, I tried a new battery, checked the fuse, check the starter relay, and still will not turn over. It has a foot start and it moves freely so engine is not locked up. Any suggestions out there???? I dont know what else to check.

 

If you didn't suck water in the engine, the stator is open behind the fan and prone to water damage. I'd fight shy of water and mud after getting it fixed. It's really not hard to do yourself, if you want to try it. You just need a magneto puller or a steering wheel puller.

If you did, there are a lot of posts on cleaning a submerged engine that explain it better than I can.

 

if the stator is open, would this prevent the engine from turning over??

 

It would kill your battery. Basically, its like an alternator. They quad won't run without it. I just mentioned that because they don't seem to like getting wet. Seen a bunch of people have the problem. Because it turned over one day and not the next, I wonder if it's 2 seperate issues?

 

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Sounds like multiple problems to me....


If you remove the spark plug and the engine turns over with its kick starter, then we'll assume its engine is ok. Ok meaning it isn't seized. If a fully charged battery will NOT allow its electric starter to turn the engine over (with the spark plug out), then it could be an electric starter problem or something to do with its wiring. If I remember correctly, the front left brake lever must be squeezed for the electric starter to work. If the electric starter does NOT work, it could be the starter motor or something could be wrong with this safety switch (and its wiring). For example, wire came off, bad contact in its switches, bad starter relay, etc. If you check every switch and every wire connection and it still won't go, you may have to take it to your dealer. Sometimes, small engine shops will work on ATVs as well. My local small engine shop does.


If you drive the SP-90 in water that's over its running boards, water will get into its CVT system and into its Stator Coil area. To me, 2 strokes minis have very bad designs. If I was an engineer, I'd install a sealed CVT system (like the Kasea brand) and have a open air cooling system on their engine. And if more air flow is needed to cool the upper engine, I'd install a 12V electric fan with automatic temperature warning light. But for today, we have to work within the limitations of every mini's engine cooling design.

For pictures of open CVT system, surf: http://community.webshots.com/album/284496072ovQNmJ

For pictures of open stator system, surf:
http://community.webshots.com/photo/...52910875EadBQs
http://community.webshots.com/photo/...52910875EpXUKy

Note: The open stator assembly (which contains the 2 stator coils) are located behind the flywheel. As seen above, all sorts of mud / crud gets into the open stator system. This can cause one or both coils to blow. When that happens, it won't generate a spark or it won't auto charge the battery. It all depends on what coil blows (burns out).


To reduce splashing upwards into the stator area and CVT area, some install a skid plate. For example:
http://www.hebcodistributing.com/pages/youthpag.html


If wondering, many of the 2 strokes are built with the same "open stator" air flow and "mechanical fan" air flow venting system for their engine.


Hope this better explains why the SP-90 should always have its water lines BELOW its running boards.


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