Improper idle.....first start-up after storage?

N

nick5oh

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Joined
Mar 10, 2015
Messages
359
Location
Hunstville, Ontario
drained my fuel tank, then fired it up and used half a can of fogging oil total. Motor died out and then I sprayed some fogging oil down the cyls and pulled the motor over a bunch spraying oil in between pulls. Like I said about a half can of fogging oil total.
I have never had my own 2 stroke anything so I have never fogged anything until this sled.
Today I went to fire it up, got it going, and it smoked and smoked and smoked and smoked forever. Would not idle properly at all and seems a bit hesitant at throttle blips. Then all of a sudden it idled properly near 1700rpm for about 30 seconds, then it stalled. Fired her up again and then crap idle again.
I'm pretty sure I got some garbage in the carbs or something but just thought I'd see if there's a chance it's just the fogging oil needs to get "cleaned out". A good rip on the stand and it'll go back to normal?
New plugs did not help by the way and it's getting good spark.
Thanks guys
 

It does take a little bit to get the fogging oil burned out and it smokes pretty good. The carbs should be cleaned though, especially the pilot jet.
 
Could not find anything!
Pilots mains air bleeds and fuel screws clean. Adjusted fuel screws 1.25 turns out. My compressed air source is limited to my mouth right now lol.
Question is.....when blowing air through pilot jet, where should air come out?
I hope I fixed something without knowing lol?
 
Hold the pilot up to a light. Looking down through it like you're looking down the barrel of a gun. Need a nice clean round hole through it. You also need to blow carb cleaner through all the passages in the carb body and make sure they spray through. There's detailed carb cleaning instructions in the tech section here.
 
Ran the sled this weekend. It was great to get out!
Sled is idling like it should, steady, but just low. Around 1300-1500 rpm. Throttle lever adjustment is ok, slight slack in throttle cable itself at adjuster. Question is....fuel screws set at 1.25 turns out from lightly seated. Is this setting ok? Will more or less turns change idle or something else?
Thanks guys
 
For your altitude, the manual says 1 7/8 turns out.

I run around 5k to 7k in elevation and I've had my fuel screws at 1 3/4 turns out. I feel like you're a little lean with your setting. I would suggest setting them at 2. See how you like it then maybe dialing them down slightly. I wouldn't go much more then 2 turns out.
 
Did you make any adjustments to fuel screws as oldIron indicated, that could help. Our sleds smoke a lot and sometimes idle abnormally the first time out until the fresh gas gets thru the system. Otherwise double check the pilot jets.
 
I have not made any further adjustments to the fuel screws. "Lightly seated" to "x" turns out is different from person to person. But before I removed them to check for dirt etc I did turn them all the way to lightly seated and it was 1.25 turns in. I removed them and found nothing and then reinstalled them to the same 1.25 turns out.
The area I ride is central Ontario. North of Huntsville area. It is not much altitude at all.
 
nick5oh said:
Isn't idle spec 1700? +- 100 rpm?
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When you let off the throttle, you might notice the engine being slow to come down to idle. This is a lean hang up that happens with these sleds. The most common way to defeat it is to richen up your fuel screws and turn the idle down to 1400 - 1500.
 
OldIron said:
When you let off the throttle, you might notice the engine being slow to come down to idle. This is a lean hang up that happens with these sleds. The most common way to defeat it is to richen up your fuel screws and turn the idle down to 1400 - 1500.
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Interesting.....I have felt it hang after letting off the throttle.
Belt guard says spec for the idle air mixture/"fuel screw" setting is 1&1/8 turns out? Is this dependent on altitude or some other factor? I'm at 1.25 turns out and idle is 1300-1500, if I go in to 1&1/8 it will be leaner which will raise idle closer to spec of 1800.
I ride around north of muskoka area in ontario Canada. Close to Huntsville. Not sure what the altitude is there if it matters.
 
staggs65 said:
You don't adjust the idle rpm with the fuel screws. There's an idle rpm adjuster on the carb rack by the cable.
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Yes I realized tonight after having total brain farts over this lol!
That screw on the rack near the cable that has a switch with two wires in it? I believe it's for the tors correct?
Yes adjust that for idle speed.
But where should I set my fuel screw? Stock? 1&1/8 out?
 
staggs65 said:
You don't adjust the idle rpm with the fuel screws. There's an idle rpm adjuster on the carb rack by the cable.
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X2

Jet for altitude and temperature, set the idle to 1400 to 1500 using the idle adjuster on the crab rack like Staggs mentioned.

Not sure why your belt guard has different specs but the chart on ty, in ty tech, miscellaneous has 1 7/8 for your altitude. That comes from the maintenance manual.

http://www.zenitram-inc.com/Manuals/MtViperTU3.jpg

Plus richening it up will help with the lean throttle hang up.
 
Spec is 1800 +-100. However, to get rid of the lean hang up, people lower the idle to around 1500 along with going just a little richer on their fuel screws.

This is what I do with a lot of others. However, if you run spec idle, the only issue is that the engine will be slow to come down to idle after you let off the throttle.
 
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