K
Built 2 more naturally aspirated four-stoke Pro's this year and have a winter's worth of riding on all three. Have $2500 to $3000 into each of them since we all already had RX1 motors to donate. Reasonably simple swap. No machining, simple wire feed welding. Fortunately cheap clean Pro's with blown motors are easy to come by. We have them on 2016, 2014, and 2011 chassis's and they run head-to head with their 2-stroke brothers. My 2016 RMK 457# before, 469# after swap. Motors have anywhere from 5k to 14k miles on them but all run strong/identical. Next step is anti-ratchets: have to run tracks crazy tight. Fuel injected; improve running on steep downhill carves. Try a 163in Track. Very fun!
Here's riding in McCall last week. https://youtu.be/9y4tFI1D03Y
Here's riding in McCall last week. https://youtu.be/9y4tFI1D03Y