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help!! I'm ready to burn my arctic cat.

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help!! I'm ready to burn my arctic cat.

  #61  
Old 01-21-2019, 11:47 PM
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Location: Notheast Alabama
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https://www.manualslib.com/manual/11...0.html?page=11 Your atv chart is listed in left lower side of page
 
  #62  
Old 01-22-2019, 12:23 AM
Trailblazer
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Originally Posted by papa hogg scoot View Post
https://www.manualslib.com/manual/11...0.html?page=11 Your atv chart is listed in left lower side of page

thanks, I bookmarked it.

crazy it starts cold with 35 psi.
 
  #63  
Old 01-22-2019, 03:46 PM
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Join Date: Oct 2018
Location: Missouri
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There is a one way check valve on your compression tester. Your engine isn't holding pressure in the head and cylinder.

There is a leakdown tester you can buy to use compressed air to determine how fast it's leaking down. All engines will leak down. The issue is how fast.

An engine running rich will put dry black carbon deposits on the plug. But, for example, if you have a carb engine, you choke it to richen the mixture to start it cold. Usually you run it for a bit to warm it up and then take the choke off. If you choke it, start it, run it for a few mins with the choke on, then shut it off and remove the plug, even if the engine is running properly you'll see a slightly darker plug. Then, if you reinstall the plug, run it like normal with the choke off, then shut it down and remove the plug, the black carbon deposits will burn off and then will be white or off white. A spark plug that stays black no matter what is indicative of excess fuel. Thick, gunky, oily black deposits are indicative of oil being burnt.

You mentioned you saw a fuel mixture coming out when you cranked it over with the plug removed. That hints to me your injector is feeding too much fuel. The amount of fuel per power stroke is miniscule.
 
  #64  
Old 01-22-2019, 08:08 PM
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Originally Posted by OutdoorExplorer View Post
There is a one way check valve on your compression tester. Your engine isn't holding pressure in the head and cylinder.

There is a leakdown tester you can buy to use compressed air to determine how fast it's leaking down. All engines will leak down. The issue is how fast.

An engine running rich will put dry black carbon deposits on the plug. But, for example, if you have a carb engine, you choke it to richen the mixture to start it cold. Usually you run it for a bit to warm it up and then take the choke off. If you choke it, start it, run it for a few mins with the choke on, then shut it off and remove the plug, even if the engine is running properly you'll see a slightly darker plug. Then, if you reinstall the plug, run it like normal with the choke off, then shut it down and remove the plug, the black carbon deposits will burn off and then will be white or off white. A spark plug that stays black no matter what is indicative of excess fuel. Thick, gunky, oily black deposits are indicative of oil being burnt.

You mentioned you saw a fuel mixture coming out when you cranked it over with the plug removed. That hints to me your injector is feeding too much fuel. The amount of fuel per power stroke is miniscule.
I know there are leakdown testers, but just from what I saw I don't think mine leaks very fast which would be good I'm assuming.

I'll try to rememeber to take a picture of the plug. I recall it being very black and thick, but not wet or oily.

I'll also try to take a video of the fuel coming out of the cylinder. Keep in mind when it was shooting out, I was holding the throttle wide open. Would the EFI not accomadate the wide open throttle by matching it with more fuel? Or is there a sensor which tells the injector to add more fuel?

 
  #65  
Old 01-22-2019, 11:00 PM
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Join Date: Oct 2018
Location: Missouri
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With the check valve in your compression tester, leaking down or not leaking down is irrelevant. When you crank the engine over, it forces pressure into the tester which then doesn't allow it to flow back into the cylinder due to the one way check valve.

A slow cranking engine (but otherwise functioning correctly) will test low on compression but if it can start, it will run fine.

The amount of fuel in the cylinder per power stroke is almost non existent. Very very tiny amount of fuel and should be extremely finely atomized....basically just vapor. If you are seeing liquid drops, even small ones, you have too much fuel entering the cylinder. The big, massive clue is the dry, black carbon deposits on the plug. Low compression won't cause that. Excess fuel will. Everything you keep describing is excess fuel. It sounds like you maintain your equipment very well so for that mileage, unless you have a broken ring, it's highly doubtful that your rings are shot. Most early wear on engine rings comes from poor maintenance....too few oil changes and air filters leaking dirt in. Doubt that's something that effects your equipment. If you had a broken ring I would also expect to see scored cylinder walls...which would trigger burning oil. But, you aren't describing that either. Fuel in the crankcase doesn't come from low compression.

You may have a couple issues. A weak starter or battery could cause the slow cranking. A leaking injector would cause the excess carbon and hard starting. Combined together they would DEFINITELY create hard starting symptoms.

The PCM takes inputs from the sensors and decides, based on the info from the sensors and the preprogrammed data in the PCM, how much to open the fuel injector. The pressure from the fuel pump is what actually feeds the fuel into the intake. The injector is just simply a variable valve that is supposed to only open the amount it gets told to by the PCM. If it begins leaking, it will be feeding more fuel than the PCM is directing it to.

Another thing is....If the injector is leaking fuel into the intake when it is shut off, the fuel is washing the oil from the cylinder walls as it runs down into the crankcase. That increases wear (due to lack of oil at start up) and decreases compression...again due to lack of oil helping the seal. There is very very little oil on the cylinder walls in a properly functioning engine anyway so washing off the oil on the cylinder walls is a bad thing.
 
  #66  
Old 02-10-2019, 05:50 PM
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Location: Notheast Alabama
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Any updates on this atv?
 
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