I just picked up a 2001 xcsp 800. It had 430 mains in it (down from the factory 460's) which I think was too low for my area and temperature range. The sled came from Southern Minnesota and I am in Manitoba. We see temperatures range from 32F to -30F. What jet size can I safely run or should I stick with the stock ones? Other then a clutch kit and a boost bottle there are no other mods on this sled. Do jet sizes come in increments of 5 - so for example from 460 - 430 = 6 sizes?