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Fuel spark compression wont start just backfires

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  • Corey Frank Sep 30, 2010

    tried that carbs clean compression is122 psi

  • Corey Frank Sep 30, 2010

    tried the key its good very little timeing adjustment

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Sounds like flywheel key broke. Remove flywheel check key, this inserts into crank and slot in flywheel its responsible for timing, cheap fix.

Posted on Sep 29, 2010

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Posted on Jan 02, 2017

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SOURCE: 1994 polaris 300 2x4 wont start

1994 magnum 425 2x4 wont start was given to me. It cranks but wont fire. and start button has no power.

Posted on Jul 21, 2009

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No start on bear tracker 250 just backfires


then the timing is not set properly .

Jun 22, 2016 | ATVs

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Has good compression,getting fuel,plenty of spark, wont start


Then either the fuel is bad or it's flooded. Dry the plug, crank it without the plug to fry the cylinder & start with starter fluid to replace fuel. If it starts. Clean & blow out the entire fuel system, lines, pump,carb. Good luck.

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2006 arctic cat wont start


If you've got decent compression, spark and fuel and it wont run - what about about air? Clean / new air filter installed? All 4 are needed to run.

May 13, 2015 | Arctic Cat 2006 650 H1 4x4 Automatic SE

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I have a 700 polaris ultra, 1997 year was running fine, backfired and now has no spark. it did start up after it cooled down and run for about 5 minutes but it now has no spark an will not run. Check kill...


A few questions so I can understand your situation better before qualifying an answer...Before this backfired, did you recently/previous run through high water?
Also, when you say "no spark", are you saying you actually pulled the plugs and field checked for spark or are you just saying no ignition/run on turning the starter? Lastly, Is this model electronic fuel injected..EFI?
Chembrew

Mar 01, 2015 | ATVs

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My 2006 Honda rancher 350 just quit running while I was driving it. will still turn over but wont start why?


Take fuel cap off to make sure it is getting air to fuel tank. Check fuel valve to make sure it is on. Drain carb with screw on bottom of carb to check for water. Pull spark plug to make sure it is firing.

Feb 15, 2015 | Honda 2006 FourTrax Rancher AT

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My 2007 450 sportsman won.t start but she backfires


Remove the seat, and take the cover off the air filter container. Place your hand over the end to aid in fuel flow to the carburator. You might not be getting enough fuel which is causing it to backfire and not start completely.
Attempt to start the ATV once you get fuel flowing you should be all set. Clean that filter as well.

Jan 31, 2015 | Polaris 2007 Sportsman 450

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Atv troubleshooting


3 things you need to check
1. spark (blue or white good) (orang or yellow bad)
2. fuel
3. compression

Jan 18, 2014 | ATVs

1 Answer

Backfires when you try to rev up engine,


check fuel flow and check spark at spark plugs

According to an "ATV Rider" 2009 article, "When the Grizzly was introduced in 1998 as a 600cc machine, the top was blown right off the displacement wars of the time."
It was replaced in 2002 with Yamaha Grizzly 660, an even bigger engine derived from the well-established all-terrain vehicle (ATV) Yamaha Raptor 660R.
Grizzly's 660 cubic centimeter (cc), four-stroke, liquid-cooled single overhead camshaft, five-valve engine performs well in open country, but sometimes it causes serious problems for owners.
Before you call a Grizzly dealer, however, trying a few tricks in your garage can save you a lot of time and money.

Check the fuel level.
Locate the fuel meter indicator on top of the multifunction display.
If it does not work properly, open the fuel tank, and push the Yamaha 660 Grizzly side to side.
Ensure the fuel is not contaminated by water or rust.
If you have not driven your Grizzly 660 for a long time, drain the tank completely, and fill it with a fuel tank cleaner.

Check fuel hoses for cracks or leakage.
The hoses should be soft and simple to bend.
Replace those that show any sign of wear.

Check the compression.
Screw a compression tester into the spark plug hole, and press the electric starter button.
If no compression exists, contact a Yamaha dealer.
Wipe wet or dirty electrodes with a dry cloth.
The spark plug gap should be checked regularly

Correct the spark plug gap.
Measure the gap with a wire thickness gauge.
If necessary, adjust it to 0.8mm using a screwdriver or replace the spark plug.
Use only a Yamaha-specified spark plug.

Check the Yamaha 660 Grizzly's battery.
Operate its electric starter.
If the Grizzly starts quickly, then its battery is in good condition.
If the engine turns slowly, check the battery lead connections, and you may need to change the battery.
If the engine still does not eventually start, your Grizzly is beyond home repair.


Jul 23, 2013 | Yamaha 2005 Grizzly 660 Auto 4x4

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I HAVE A 1999 POLARIS 335 SPORTSMAN STARTS FINE WHEN I TRY TO ACCELERATE THE QUAD BOGS FEELS LIKE ITS GOING TO STALL BUT THEN GOES BUT NOT AT FULL POWER AFTER RELEASING GAS THERE IS A LOUD BACKFIRE ...


carbon on the plugs indicates flooding
the backfire indicates fuel being ignited in the exhaust
have the carby /fuel system professionally overhauled

May 27, 2017 | Polaris ATV

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