1980 cuyuna troubles Feb 29, 2020 20:14:31 GMT -5
Post by kerry on Feb 29, 2020 20:14:31 GMT -5
Hey guys having a terrible time with our whip this season and i'm stumped. The original motor was getting tired so I put a spare engine in I had.We had a few small rides but on a longer ride we lost the pto side to overheating. So I redid the whole motor with a new gasket and seal kit and a spare matched mag side cyl/piston head set I had.We did a ride of 60+ miles 3 weeks ago and it ran flawless.Temps were -28 celsius to -10 celsius (cold) for the day.It was left in the trailer for the week and we went for a ride the sunday and it blew a hole in the pto piston .It was -1 celsius about 30degrees fahrenheit. I spent the following time pulling it all apart.put a different crank in it,another spare mag cyl/piston/head and resealed.Timing is on the low side at .103 and gap is .015.It was at .106. Today we left for a ride and stopped 4 times as I checked plugs not long after the forth time it died on my wife.Soon as I lifted the hood you could see the heat coming off the pto side.I pulled the plug and saw the top of the piston was already cleaned off so I pulled it back to the trailer.When we got home,and I knew, it fired right up.I have no more spares left and likely will have to find another parts motor or get new pistons at least. I have 4 stock sized cylinders to play with that would likely need a light cleaning hone.BUT am I only going to have the same issue? Should the clearances be different on the pto side because its naturally hotter running? I use B9es plugs on that side, premium 91 only mixed at about 45 to 1.Seriously thinking about swapping out to a different motor.Wife likes to ride,we like doing 50-70 mile rides but i'm tired of wrenching away good eves trying to get it back on the snow.Could be fishing!!