I just got this sled about a month ago, after the first snow I fired it up and went for a short ride, seemed to run okay but it was a bit boggy, I just thought maybe old gas, drained the gas tank. Week later went for another short ride, started good, idled good, but not long into my ride it started to bog down again and a few times it seemed like the engine cut out altogether, I had to keep pumping the thottle and useing the choke to get it back to my house, not long after I got it back to my house it died and would not start again, took it into a nice heated building let it sit for a few hours and it fired right up again, okay I thought maybe just moisture in the fuel system, added gasline antifreeze, also a friend of mine who works on snowmobiles was there so he checked the fuel pump, cleaned the carbs, changed a few gas lines, checked the engine compression, checked for good spark all seemed good.
Took the sled back to my house, unloaded it, fired it up, idled good, about a 1/4 mile into my ride it started doing the same thing as before eventually stalling and now it wont start again. I took out the spark plugs and put a little gas in each cylinder, put the plugs back in and tried starting it , it did fire but as soon as the gas I put in cylinders was burned up it quit. Any ideas on what to try next because I'm out ideas.