75 Sno-Twister 440 cc gearing

snowman65 · Post by **snowman65** » Sat Jan 24, 2009 9:38 pm

I have a 75 Sno-Twister with the Kohler 440 free air in it of coarse but I was wondering why my engine states it is 429.4 cc instead of 439 cc.It is a K440-2RC engine.I have had this sled for about 15 years now and was always curios about this.Also I used to grass drag this and I installed the gears from a 76 Trail-Twister thinking I could get faster times in 500 ft.I can not remember if I changed the driven unit when I swapped gears so if someone could tell me the diameter of the original 75 Sno-Twister driven unit I would appreciate it.I am putting the sled back to recreational use.
Thanks

Drivebelt · Post by **Drivebelt** » Sun Jan 25, 2009 12:00 pm

My manual lists the motor at 429.4cc, but the plate on my motor has been worn by the airbox so I can't read it. I have another bell-housing and the plate reads 429.4cc. I have seen reference to shallow-base cylinders and deep-base cylinders, possibly a later run of motors had more displacement?? The secondary on my 75 is about 9 7/8" across, roughly 1" smaller than the T/T secondary.