Question about Polaris ATV

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I put new piston and rings in my polaris 1990 trailboss it started for a min and died whats wrong

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  • monty murphy
    monty murphy Dec 09, 2014

    it is getting spark and had water in crank



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How is the oil? Did it seize or just stop igniting? All engines have little oil pumps of some nature. If it seized, no oil circulation.
Check, plug and feel compression. Change plug...if you got oil in during assembly, maybe fouled plug.

Posted on Dec 10, 2014

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  • 78 Answers

Was it literly a minute that it ran or was it like 10-15 minutes with you reving it up a bit? It could be many different things from as simple as it ran out of the gas that was in the carb and the tank valve is shut off to things like your magneto coil is shorted, no spark. Have you checked for spark and fuel? Does the engine have compression? More details will help solve your problem.


Posted on Dec 10, 2014


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SOURCE: polaris will not run

Seriously, guydaigle? The 300 Xpress is a two stroke. The problem is too much fuel. Start by checking and adjusting the carb. Look at the needle & seat, then the float level.

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SOURCE: 1990 polaris trailboss , trans ,or clutch slips in water

Check for wore clutch belt and also check to see if your getting water in the clutch housing. If your getting water in the housing, your clutches could be corroded as well. There should be no water getting in that shroud.

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SOURCE: 1998 polaris trailboss will turn over but not

more information needed, is there spark, fuel, check basics first

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SOURCE: Instructions to tighten the chain on a 2003 Polaris Trailboss 330

I have the same problem and it's wearing on my frame we tightened it and all it did was stiffen the suspension

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SOURCE: Brake fluid for a '91 Polaris Trailboss ATV

just check here is solution you find for polaris parts...

Posted on May 14, 2013

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I have a 2000 Polaris 400 that had 30 lbs compression. top end was rebuilt, and cylinder honed. New piston, rings (staggered against stop tabs), wrist pin bearing and pin, and the retainer clips were...

Hey Brandon, there could be several things... one is you put the piston in backwards... the arrow goes toward the exhaust..(if there are holes in the piston, they go in the back).., you installed the wrong piston..or..skirt was too long.., you left something inside the engine..(dropped one of the circlips in the engine).. the rings were installed upside down..,one of the circlips came out..., you got a bad piston..(never seen this happen).., the cylinder needed boring and it had so much clearance that the skirt caught on the intake port lip...

OK...Brandon, repairing this engine correctly is going to require a COMPLETE DISASSEMBLY - there are tiny tiny bits of aluminum in the main bearings, packed in between the main bearings and crank seals.. its in the main rod bearing..and its all in the bottom of the cases... THE ONLY way to effectively remove ALL this is to pull it apart.. this is not a hard job, but if you have never done it, PLEASE take it to a qualified requires several special tools... .they may/should be able to tell you what happened to cause it too..
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There is an arrow on the piston that faces toward the EXHAUST port. If there are hole(s) in the piston, they go towards the INTAKE.
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