Ok so here's the deal I posted before bout' the sled bogging down. Found out it wasn't the clutch or belt it was fouling a plug on the fan side
Changed the belt anyways and plug (8's which are proper and gapped) got it running good again
So two days ago I go for about an hour ride no problems. Today I start it up, let it warm up and take off. Get about 1/2 mile and foul the fan plug again. walk home grab 2 more plugs put them in and foul it again. Same tank of gas as two days ago(40:1)
Took the good plug out and put it in the fan side and fouled instantly
I thought I should add again it's jetted ok plug are brown usually carb was cleaned new fuel line new belt clutch cleaned etc etc
oh yeah 82 mirage 2 fan cooled single mikuni carb 377 rotax
Also I put a new(used but good) track on and I think it's a little tight any info?
New slides shock greased everything etc man I put so much time and money into this thing this season it's just pissing me off
Have you tried hotte plugs in that side? If it is not that then maybe the compression on that one side is gone. CHeck it by taking the plug out and Either get a compression tester or put ur thumb over it and pull it over. If it pops off with great force then it is good.
Do you have spark on that cylinder. Maybe if the spark is ok, your float is sticking or there could be ice in that carb. Does it have dual or single carbs? If the spark is good. I would pull the carb and go throught it.
That which does not kill me, will only make me faster.
I had the same problem with my 96 Formula Z 583, it turned out to be my fuel pump, I cleaned my carbs, replaced the needle and seat on them both but that didn't fix the problem.
I asked the local Skidoo expert what could be causing the problem and he asked if it was the same carb that was flooding and fouling that side plug, it was, he said it's the fuel pump.
It's not hard to check.