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My dinli 90cc atv has no spark

It wont start the plug has no spark it has compression just no spark an i dont know if its just the plug or if its done for

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 6 Answers

SOURCE: I have fsn 90cc atv that I cant get no spark to

try putting in a new spark plug in

Posted on May 25, 2009

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1 Answer

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My Polaris Sportsman 90 ATV has 70lbs of compression on the engine is that enough ? It does not start .


70lbs for a 90cc should be good, but 80-85 is better. Compression drops from piston rings wearing out, most of the time. Piston rings wear out from old oil...every time. Rule of Thumb: 5 tanks of gas, change your oil !!! It's not a car !!! A car has 5 quarts of oil which takes about 3 months to break down (2,000 miles or so), 90 cc engine has a half a quart, which takes about 3 weeks to break down (based on everyday use) SO...5 tanks of gas, change your oil..

as for the not starting thing, check for spark (should be a blue spark ONLY, any other, replace plug, orange won't ignite gas) if you haven't been riding for a while, open the drain screw on the bottom the carburetor and drain the water out. Ethanol turns to water when the gas sits too long...

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1 Answer

My 2002 polaris trailblazer wont start it has fire


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Also try a splash of good gas in the throat of the carb or intake (if fuel injected) with a new spark plug. My bet is it fires just fine.

If this is a fuel injector type engine you could have a bad injector control unit or a clogged injector.

If it fires with gas in the intake manifold then suspect carb or injector system. (which ever applies)

Thanks for using FixYa!

Kelly

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110cc atv wont start got gas and spark but dont start..


There are three things required for combustion to occur: Fuel, compression, and a spark (at the right time). One, or more, of these is/are missing.
If the bike has been in storage for more than about a year, then you can bet that the carburetor is plugged up. It will need to be completely disassembled and cleaned.
Also, check the compression. if it has a four stroke engine, it should be capable of developing at least 135 psi of compression (throttle wide open, choke fully open). If the compression is low (and it is a four stroke engine), check the valve tappet clearances. Insufficient tappet clearance will cause low compression.

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