Mine is a .36 shimmed to a .30 and I am pulling 33mph track speed in the deep stuff and it seems to shift out fine. This is by far the happiest I have been with my setup.
This is my setup:
660 Kit
SLP blue/ping Pri spring
10-54 weights
Ultimax XS 809 Belt
56-38 .36 Helix
Blk/White Secondary spring
SLP Helix shim
I ran 8100-8350 all day in nipple deep snow with 33 mph track speed. 12.8 at WOT A/F ratio, 290 Mains
This is my setup:
660 Kit
SLP blue/ping Pri spring
10-54 weights
Ultimax XS 809 Belt
56-38 .36 Helix
Blk/White Secondary spring
SLP Helix shim
I ran 8100-8350 all day in nipple deep snow with 33 mph track speed. 12.8 at WOT A/F ratio, 290 Mains