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Rough idle

Canadian Lad

Extreme
Joined
Sep 11, 2005
Messages
121
Location
Ontario Canada
I have developed a problem and am not quite sure what it is. When I went to start the vector GT this week to be sure the battery was charged etc. It started up real good but then when I tried to close the choke it would stall every time. Started up easily enough again but does not want to run without the choke. When I finally did get the choke off it idled at abot 5oo rpm and when i tried to speed it up with the trottle it would stall again. The only way to get it to speed up was to play with the trottle and give it shots of gas until it finally picked up revs and then it was OK again until the revs died down. Seems to idle rough and I think it had a rough sound to the idle. Ran good a few months agao when I started it.
Ideas? Oh yea when I went to check thew plugs one was black and the other two not as much so. Figured I would try and change them only to find out that when I bought the new ones they gave me the wrong ones (gave me BR9ER and shoud be CR8E) I have a few ideas but wander what you all think could be wrong
 

I'd say go with the new plugs, seems like a cheap way to go. Why you may have fouled one is another question, but I'd try the plugs first. I know my '06 GT and my Wife's ER did the same thing last year when we were getting ready to go on our first ride, changed the plugs and no problem the rest of the season. The guy at the dealer recomended storing them with the old plugs and then once you get them running switch over to the good plugs from the previous season. I've got the old ones in there now and will try it this winter.
 
I had the exact same problem with both our sleds at the same time.
After cleaning carbs and alot of other things on my sled, I changed the fuel [I had syfoned the fuel and put new gas in in spring when I put them away] This is about 2 months later, anyway the new fuel did the trick. Changed the the fuel on the wifes sled and it was cured also.
I start them every two weeks. Now another couple months are gone and they are starting to act up again.Time for another change.
I did a search on ethanol fuel attracting moisture and found the boating crowd are having alot of trouble also. They say adding more isopropanal only makes things worse.
I have also had similar trouble with my Merc 4 stroke outboard , one lawn mower that is seldom used and my Yamaha quad, fuel changes were the fix. I am very careful with my fuel, 100 mesh filters, etc., when I changed my boat gas it had some water in the bottom, when checked in a white pail, so that tells me the ethanol had sucked up more moisture than it could hold.
We have had a very damp year with alot of hot days and cool nites. This trouble seems to effect engines that are not used much[at least not using much fuel] and do not have the type of fuel cap system vehicles do.
For me I will use premium fuel, no ethanal, in everything that does not get much fuel used.
A couple farmers say they add 1/2oz. of 2 stroke oil to each 5 gal. of gas with good results ??? Not sure what this would do?
Ethanol, when made should be distilled down to 1% moisture, maybe some of it is not so careful made and starts out with a higher % of moisture.
 
Today it was time to run our sleds again.They both start extremely well, but mine stalled every time I tryed to sneak the choke off. I finally got the choke off on the wife's rage, but it just barely stayed running.
Changed the fuel in both and they sat till after lunch and both were cold. Both started well and was able to get the choke off on both about 30 sec. to a min. after the temp. light went out, they sat and idled at 1300 to 1400 rpm as smooth as normal. Even though they just had new plugs , this doesn't do them any good so I will put new ones in for the start of the riding season.
The removed fuel, ive been burning in my truck, one can at a time after ensuring it was clean and sceening through a 100 mesh [not supposed to let water through] screen.
Two things that probabley contribute to the problem is I only put 3 to 4 gal. of fuel in for summer and my snowmobile shed is not insulated, heating and cooling with the day causing the sled tanks to breath. I've done the very same thing for the past 8 or 9 years with no problem, so I'm covinced it is the ethanol fuel.
 
Well I tried changing the gas - no luck Let it run for quite awhile and shut it down. Started it up the next day - same problem Starts easy but idles at 4-500 and hard to get the choke off. Also bogs as soon as you try to increase idle or spin the track. Idles at 14-1500 for a few seconds after gunning it and then dies to 4-500.
Change the plugs and tried that - same thing. Ruff running - no idle speed and can't get the ckoke off for a long time.
All this is strange as it was running great untill now.
Guess I'll end up taking it in and getting a technician to check it out. Possiblly a gummed up jet.
 
Bingo!

Pilot jets are extremely small on the Genesis 120 engine.

The first season I put the sled in summer storage I fogged the engine until the engine died. The residual fuel in the carburetor gummed up the pilot jets and required cleaning.

I had my dealer clean the pilot jets.

Since I found out how small the pilot jets are and took the suggestion by another TY member, I have installed fuel shutoff valves on the sled just before the fuel pumps.

Summer storage procedures are now a bit different. Just before the engine starves itself of fuel, I'll fog the carbs as the engine dies. Then I'll pull the spark plugs and fog the cylinders. With the plugs out of the cylinders I'll turn over the engine for about a second or two, to ensure the cylinder walls are lubricated with fogging oil.

I'll clean the old plugs and then put them back in for summer storage.

I also drain the fuel tank for the summer storage.

Coming out of summer storage I put a few gallons of fresh fuel in the tank and crank it over. It may take a bit to pick up fuel and fire. Once the engine fires it will smoke a bit until the fogging oil is burned off.

Once the engine runs smoothly for a few minutes, I'll replace the old plugs with new plugs and am ready to go for the sledding season.

This sequence has worked very well for me, and have avoided pilot jet cleaning and any further rough running engine problems.

Hope this helps! ;)!
 
Two more suggestions.

1. Open up air box, make sure no critters have built nests in it or under it where the air inlet is.

2. Get some Seafoam fuel addative (most NAPA dealers carry it and if you do a search on it here there are postings about who carries it in Canada). This stuff is amazing and will clean out carbs and jets and stabilizes the fuel. I used it on my motorcycle and my fuel mileage went from 40mpg to 46.
 


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