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Discussion Starter #1
Hi Fourm, hoping you can help.

My 2016 grand touring LE 900 ACE was idleing rough. I noticed it after my first ride of the season (20 min) yesterday (May have been doing it prior but didn’t notice it)

Further points
- rough idle stayed at 1200 rpms
- sound like a very faint ‘spark’ during rough idle (Hood was vibrating)
- I tried a number starts and a couple times it would cough but wouldn’t turn over
- when lifting on jack stand, I engaged the throttle to 2000 rpms and rough idle noise was gone
-new battery was installed 3 months ago along with valve cover replaced under recall ( no rough idle then)
- fuel stabilizer added end of last year
- always ran 91 octane
- during the quick ride I took, the acceleration was fine and no notice performance issues.

Dealer can’t get to it for a while so wondered if there’s thoughts that a novice sled guy can explore?

Thanks in advance.
 

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hi jake
it sounds a bit lean at idle
maybe the stabilizer didn't work perfect and the idle jets are a bit plugged/smaller

it should clear up with more idling

just guessing
the quality of gas nowadays is iffy

i hope it clears up with new gas
after a short time

some of those jets are hard to get at to clean:bc:
 

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You can add some seafoam to tank and run for a while then let sit once mixture is in system. Start it up again the next day. See if it cleaned anything.
 

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Discussion Starter #4
Thanks for the insight, I appreciate it. I was worried it was something much more serious as it just came off warranty
 

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How many miles on the sled?

Is the gas new?

Check and make sure the plug cables are snapped into place, maybe something got knocked loose when they did the valve cover.
 

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Discussion Starter #6
Gas is from last year but Sta-bil fuel treatment was added in the spring when I did the oil.

I’ll check the caps. Thanks.
 

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Gas is from last year but Sta-bil fuel treatment was added in the spring when I did the oil.

I’ll check the caps. Thanks.

Oh definitely put new gas in it! Sta-bil is junk imo. On any sled, siphon out left over gas in the spring and put in fresh just before first start of the season. Rule of thumb that has let me avoid any gas/ethanol issues.
 

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Discussion Starter #9
Thanks very much. After Syphoning out old gas do I need clean/replace anything that would have been impacted by the ‘bad’ gas?
 

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Thanks very much. After Syphoning out old gas do I need clean/replace anything that would have been impacted by the ‘bad’ gas?
No the new gas will act as a cleaner for when it goes through the fuel system. Your idle SHOULD clean up after some run time, maybe some nice full throttle pulls do get those injectors opening and closing a lot.

When did you change your oil last?
 

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Thanks very much. After Syphoning out old gas do I need clean/replace anything that would have been impacted by the ‘bad’ gas?

You shouldn't


As stated, syphon out old gas as much as possible. Be careful when syphoning gas out to not put the hose to far down so it doesn't get caught on the fuel pump. Once done, new gas and hopefully you should be fine.


Are you sure the sled is running on all 3 cylinders? The plug connector or pins inside the connector as known to vibrate loose, think more common on the 1200's, but heard of 900's also. Easiest way to check is wiggle the wires as the motor is running and see if there is a change in rpm's, usually will rev higher.
 

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Discussion Starter #12
the oil and filter was changed over the summer. Then put on the trailer and stored. It was started every month/month and a half
 

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Discussion Starter #13
Thanks very much. After Syphoning out old gas do I need clean/replace anything that would have been impacted by the ‘bad’ gas?

You shouldn't


As stated, syphon out old gas as much as possible. Be careful when syphoning gas out to not put the hose to far down so it doesn't get caught on the fuel pump. Once done, new gas and hopefully you should be fine.


Are you sure the sled is running on all 3 cylinders? The plug connector or pins inside the connector as known to vibrate loose, think more common on the 1200's, but heard of 900's also. Easiest way to check is wiggle the wires as the motor is running and see if there is a change in rpm's, usually will rev higher.

I didn’t check that. Right now at idle it’s running at 1200 rpm’s, is that low?
 

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We have never had issues with fuel in our 4 strokes..Add fresh fuel and take it for a run..Unless there is something else like others have stated..
 

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Thanks very much. After Syphoning out old gas do I need clean/replace anything that would have been impacted by the ‘bad’ gas?
As harley said add some seafoam to the fresh gas and let it idle, put it on a track stand and engage it to run some new fuel/seafoam threw it. I hope that's your fix,,
 

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the oil and filter was changed over the summer. Then put on the trailer and stored. It was started every month/month and a half
The worst thing you can do is start it every month, you are going to build moisture and load your plugs. Just put it away, let it set and start it in the fall. You may have a fouled spark plug. Easy way to tell if you do not have a heat gun, is start it up and touch each individual runner on the exhaust manifold, if one is cold, you have a dead hole.

Bob
 
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hi jake
it sounds a bit lean at idle
maybe the stabilizer didn't work perfect and the idle jets are a bit plugged/smaller

it should clear up with more idling

just guessing
the quality of gas nowadays is iffy

i hope it clears up with new gas
after a short time

some of those jets are hard to get at to clean:bc:
This is a fuel injected sled, no jets!

Bob
 
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To winterize or summerize a 4-strokenfor storage I siphon off the tank empty.

Add Aspen or VP non mixed fuel...and run engine so that fuel gets into the engine.

Then fill the tank with Premium NoN Ethanol and add some Octane Boost.
 
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