Bought a 01 MXZX 800 w/192 studs, stock motor. I bought and installed a used pair of precision skis. The carbides are very worn. Hard to tell the length of carbide. What length of carbide(s)do you suggest for aggressive packed trail riding, with ice a distinct possibility(Vermont)? Probably go w/Woodys . I think they are called Executive.Also, what is the stock jetting for this machine and what would be suggested for 1,500 to 3,200 ft. @20 degrees f?