Ok, I've been battling a rich condition with this sled for a while now with not much luck. I thought I had it under control last weekend when I took her out and ran great for about 1/1/2 hours and then on the way back it started bogging, wouldn't go past 6000RPM or 45MPH, and seemed to run rich again at idle and would stall out unless i feathered the throttle. It was -22 out and nothing under the hood got wet and i was not in any powder so i don't think anything froze or got moisture in it, especially since it's been doing this crap since i bought the sled early this year.
So I took both carbs off again and gave them another cleaning hoping for a little luck. Reinstalled and set air screw to fact spec 1/1/8 turn out from bottom. Sled starts fine but falls on it's face at low rpm and pops alot at low and it has to be feathered to increase rpm but then will open up.
Maybe it's dropping a cyl? It pops a lot at low rpm like it's missing and has popcorn in the pipe! Now How can i check for sure if it's loosing a cyl? I felt each side of the y pipe after a few minutes of running and the mag side was just warm but the pto side of the y was hot enough to burn your hand.(not sure if that means it's not firing the MAG cylinder but maybe a good indicator?) I have spark at both plugs, there are no air leaks at carb boots. The sled has HAC on it so I don't know if that is the problem or not. I was told HAC should not effect idle or low rpm since i am at sea level.
This is driving me nuts! I need some help here. I called the shops around town and they can't even look at it until after the 1st of FEB!
Specs on sled are 95 stock:
needle setting at 3
mains: 420 on both carbs
air screw 1/1/8 out from bottom
idle screw is up to about 3- 3/1/2 turns in to keep proper idle speed
compression on both cyclinders is about 155psi in both
From looking through the RAVE valve ports the cylinder wash on PTO is dark brown on whole top and on MAG it's pretty clean not much brown at all.
plugs from last run PTO side looked pretty good MAG side plug was clean (not much carbon or browning but did not look hot) again, spark at both plugs.
So I took both carbs off again and gave them another cleaning hoping for a little luck. Reinstalled and set air screw to fact spec 1/1/8 turn out from bottom. Sled starts fine but falls on it's face at low rpm and pops alot at low and it has to be feathered to increase rpm but then will open up.
Maybe it's dropping a cyl? It pops a lot at low rpm like it's missing and has popcorn in the pipe! Now How can i check for sure if it's loosing a cyl? I felt each side of the y pipe after a few minutes of running and the mag side was just warm but the pto side of the y was hot enough to burn your hand.(not sure if that means it's not firing the MAG cylinder but maybe a good indicator?) I have spark at both plugs, there are no air leaks at carb boots. The sled has HAC on it so I don't know if that is the problem or not. I was told HAC should not effect idle or low rpm since i am at sea level.
This is driving me nuts! I need some help here. I called the shops around town and they can't even look at it until after the 1st of FEB!
Specs on sled are 95 stock:
needle setting at 3
mains: 420 on both carbs
air screw 1/1/8 out from bottom
idle screw is up to about 3- 3/1/2 turns in to keep proper idle speed
compression on both cyclinders is about 155psi in both
From looking through the RAVE valve ports the cylinder wash on PTO is dark brown on whole top and on MAG it's pretty clean not much brown at all.
plugs from last run PTO side looked pretty good MAG side plug was clean (not much carbon or browning but did not look hot) again, spark at both plugs.
