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Just wanted to no what the compression should be on a polaris deisel 455

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This is only a guess but would say above 350psi at operating temp with a max difference of 70psi between cylinders.This is the spec for the John deere 455 diesel mower and could be or not close to what you need.Hope this helps.

Posted on Nov 17, 2009

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Posted on Jan 02, 2017

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2007 Polaris phoenix 200, has new fuel cleaned carb,good blue spark,fires don't start or run,plug lil wet but not flooded or soaked


If you have spark at the right time, fuel, air.... you might try a spray of staring fluid. I would then check the compression. If it is too low it will not start.

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First, does the carb have gas in the float bowl? There is a screw or bolt in the very bottom of the carb's float bowl, loosen it and gas should flow freely, IF NOT,, there is the first problem you need to address. Check this and let me know. Doe the motor turn over freely? Does it have GOOD compression?

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check to see if you have spark. if you have spark then spray some starting fluid into the carburetor or air box. if it does not start then check the compression, if the compression is good, and you have spark then check the camshaft. these have been known to eat the exhaust lobe of the camshaft right off. that is where i would start.

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1 Answer

2002 polaris scram. 90 cc. all new top end and new carb. Come 2 me with no compression, found rings stuck to piston and jug scratched up. Like i said new top end and carb. starts great and idles great,But...


First question since i am assuming it was just sitting around for some time if i am correct you need to pull the carb remove the float bowl and components if everything was done correctly with your rebuild the likely problem is your carb is gummed up remove everything in the carb low speed jet etc. soak everything in sea foam fuel cleaner overnight and hopefully you have some compressed air and blow out that low speed jet and passage way pay close attention that you have see fluid coming from the other end and check the jet make sure it is unclogged hold it up to the light.

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1 Answer

1998 Polaris Explorer 300. Could you please tell me what the compression reading should be? I turns over but wont start, will start if boosted but dies out when you let off the gas. Before all this started...


Hey Ang,
Just from what you have told us... this seems a little more complicated than simple... Does it only run wide open? ...Has anyone been "working" on this atv...?? IF they have been working on the carb, you may have put the slide in incorrectly...there is a groove down the side of the slide and a pin in the carb the groove runs on...
1. Compression should be 120PSI...or more, with the the throttle held wide open and kicked over 5-8 times.. The carb may need to be professionally cleaned and set...(take it to a qualified professional)...do this and reply to me..

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