2 stroke hard to pull...


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Old 07-10-18, 07:17 PM
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2 stroke hard to pull...

I am attempting to bring a 1986 Polaris ATV back to life. Iíve worked with 4 stroke go kart engines lots and done basic maintenance with 2 stroke stuff - but not too deep in the 2 stroke engines.

So so itís hard to pull the starter rope and it sort of jumps around. Not impossible but doesnít feel like it should be so hard and unsmooth. When i take the spark plug out it turns real nice and easy.

So its old and im thinking i have to rebuild probably. The carb is fully off and Iíve removed the exhaust. The drive belt on the clutch is off too. So nothing should be holding the engine back from turning easy.

If it was a bad cylender, piston, rings, crank, or bearings it would be hard with and without the spark right? So why easy with spark and hard without?
 
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Old 07-11-18, 12:06 AM
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Usually if it's hard to pull with the plug in and easy without, it's because there is oil and/or gas in the cylinder. It could also just be hard to pull, some of these engines have a lot of displacement.
 
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Old 07-11-18, 04:33 AM
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How big is the ATV?
What do you mean "it sort of jumps around"?

My dad has a 500 and the pull start is the most I can handle. It's hard to pull and the machine starts easily and runs great but that's a big cylinder to start by pull cord. It makes you understand why electric starting was invented.
 
 

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