Whirlwind running hot

[S_Kyle]

I was out at the minnedosa relic run this weekend and had some issues with the Massey. The motor was rebuilt in the spring after blowing a hole in the PTO side piston.

The temp was around 15 degrees F and I was running premium fuel at 50:1. There was a fair bit of soft snow on the ground. I noticed that after a wile the motor was running a bit hot (I think). The plugs looked great a coco colour. Towards the end i noticed that the duct work had come off the fan.

I know I am rambling a bit but I am afraid of burning the motor down again. The sled till starts well with a couple primes and runs good so I guess I didn't hurt it to much. I was wondering if the 50:1 is to lean, or if these motors just run a bit hot?

[JDT]

Cuyuna's do run warmer than most. Good air flow is important above zero.
What plugs are you running?

[S_Kyle]

RN3C, the front vent kept on plugging up every time I hit a drift so that wouldn't help things either.

[spudnut]

Well, I see two different recommendations for gas to oil ratio in the book I have. Cuyuna says 40:1, and Ski Whiz says 20:1. I would go with the 20:1 and both recommend premium gas.

[S_Kyle]

She is trying her best to melt down again. I went for a ride on the weekend, the temp was around freezing so I added some more oil and set out. Got 5-7 miles and she was way to hot, limped back to the yard and had to resort to a 440 Everest for the rest of the day as the LF was being rode already.

I guess it is done for the year, next year I will have to try something different. Maybe colder plugs or turn up the carb? At least the LF is still running like a top.