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2011 Sportsman 800 EFI Fuel issues

350 Views 4 Replies 3 Participants Last post by  polman500
Hi everyone, new to the forum but long time reader.
I am looking for some advice on some fuel injector issues on my 2011 Sportsman 800 EFI.
A few years ago I had an injector fail and stick wide open causing gasoline to wash the cylinder wall and wipe out the rings. I rebuilt the top end and replaced the injectors with aftermarket (cant remember what brand, but I think it was an ebay purchase.) The machine has seemed to run fine since then but it does seem to run rich (mild unburned fuel smell in the exhaust.) And I need to stay on top of my oil changes because gas will end up in the crankcase oil after a while.
Has anyone had any issues with aftermarket injectors causing a rich condition?
I just had my fuel pump fail and I am considering replacing the fuel injectors again while I have the fuel system torn apart. Do you think they are the culprit? Can anyone recommend a good brand of injectors I should use?
Is this unnecessary and the problem could be something else? I am a little worried the piston rings could be the problem, I performed a cold compression test and both cylinders were at 145 ( I actually don't remember what the compression should be, but I was glad to see they were both the same.)
Any help or recommendations would be appreciated.
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Hi everyone, new to the forum but long time reader.
I am looking for some advice on some fuel injector issues on my 2011 Sportsman 800 EFI.
A few years ago I had an injector fail and stick wide open causing gasoline to wash the cylinder wall and wipe out the rings. I rebuilt the top end and replaced the injectors with aftermarket (cant remember what brand, but I think it was an ebay purchase.) The machine has seemed to run fine since then but it does seem to run rich (mild unburned fuel smell in the exhaust.) And I need to stay on top of my oil changes because gas will end up in the crankcase oil after a while.
Has anyone had any issues with aftermarket injectors causing a rich condition?
I just had my fuel pump fail and I am considering replacing the fuel injectors again while I have the fuel system torn apart. Do you think they are the culprit? Can anyone recommend a good brand of injectors I should use?
Is this unnecessary and the problem could be something else? I am a little worried the piston rings could be the problem, I performed a cold compression test and both cylinders were at 145 ( I actually don't remember what the compression should be, but I was glad to see they were both the same.)
Any help or recommendations would be appreciated.
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Compression spec is 150-200
Hmmm, looks like I am a tad low. Thinking that might be my issue, fuel is blowing by the rings and contaminating the oil.
Compression results can vary some depending on cranking speed and should be done with wide open throttle. A leak down test can help pinpoint where the loss is... rings, valves.
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