Wr vs 501
I've had two snow bikes. A '17 fx (similar to wr) and a 10' te 510 husky (similar to 501). Also ride with a 14 ktm 500 exc. We have three fx's in our group. With just under 100 hrs lost the crank rod bearing on one of the fx's. Both the te510 and 500 exc have over 300 snowbike hours and have never been apart. I think the longer stroke engines (500's) provide torque and longevity. Unfortunately, the cost difference makes it a difficult decision. Fwiw.
I've had two snow bikes. A '17 fx (similar to wr) and a 10' te 510 husky (similar to 501). Also ride with a 14 ktm 500 exc. We have three fx's in our group. With just under 100 hrs lost the crank rod bearing on one of the fx's. Both the te510 and 500 exc have over 300 snowbike hours and have never been apart. I think the longer stroke engines (500's) provide torque and longevity. Unfortunately, the cost difference makes it a difficult decision. Fwiw.