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2-strokes can be pigs on gas, especially cats. The 660 4s is a good engine that I believe was made by Isuzu. Newer Bearcats can have some intermittent electrical problems. And as far as handling, well ... they are utility sleds, but suspension adjustments can be made to make them handle 'good'. The issue stated with deep snow is more a suspension setup than anything else. It must be trenching, so maybe the front skid limiter strap needs to be pulled up or some other rear suspension adjustment made.
wHY DON'T THEY COME SET UP RIGHT ?
Suspensions are adjustable for different conditions and riding styles. A "trail" setup may involve shortening the limiter strap, and reducing or increasing the tension of various springs, to put more weight on the skis to improve trail handling. A side effect of this is known as trenching, where the track tends to dig in rather than floating on top of the snow. At the other end of suspension tuning is a deep snow setup where the limiter strap is let out, and again, various spring tensions may be adjusted. In this case, the track takes more of the weight, runs flatter, floats better. With less weight on the skis, the sled doesn't turn as well on the trail. This is a greatly over-simplified explanation of the differing options for tuning your suspension for different types of riding conditions, passenger and/or cargo loads, personal preferences. It was just to illustrate the point that there is not one setting that all "properly set up" snowmobiles should have.Hope this helps.Cheers!