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Maybe it's more track spin in deep powder with the 1.61. Distances I'm talking about comparing 1.61 to 1.67 are a mile or more in deep powder. I have only an unscientific observation for this, you are correct. I didn't change gear numbers in my ECU, but my speedo definately showed a 6 mph...

From the chart you can see I'm used 1.67 gears for test 4 and 5. The 1.74 may be quicker in some conditions. Interestingly, the stock 1.61 gears are about 6 mph faster breaking trail on the lake in deep powder than the 1.67 I'm running now. But I've settled on the 1.67, specifically for the...

Your rpms seems good at the end. But the 7800 start seems low. What temp outside? Does your belt deflection make the track creep on the stand? It should.

I agree that if I had a 140/220 I would use it. A 2015 Indy 800 is in our group. We used to be ski tip to ski tip. Now, I can turn the rear clicker up to 14 to intentially loose the hole shot to the Indy. But I still go by the Indy at 50 or so even losing the hole shot. When being serious...

Test 5 at 34 deg F. 70 pitch chain with 40B and 24T gears. 155-222 secondary spring team black. Helix 46 - 42. Results are 106 mph and 8250 rpm in 1320 ft. I'm impressed. This combination will easily pass the C note in warm spring weather. I've got to give a shout out to Brock and Doc. They...

Test 4 at 10 deg F. 70 pitch chain with 40B and 24T gears. Stock secondary spring blue/black. Helix is 46 - 42. Results are 108 mph and 8250 rpm in 1320 ft. Didn't reach top speed or rpm in 1320, still climbing. No sharpie marker left for full shift out. Going to be 36 f today. Switched to...

Back in the saddle again. Shock needle shaft part took a little while to get. Supplier issues I heard.

Your likely problem is your secondary or your belt is too short. You are not overheating the belt based on your checks. Belts fail due to heat or overload. One overload cause is binding in the secondary clutch. One good check is to pull both clutch springs and put the clutches and belt back...

Hit a rock just below the deep snow surface. Rock profile (frozen river) was like a cement block. About 30 mph. Sled stopped instantly and spun 90 degrees. I kept going 20 feet further. Doing something I shouldn't have been doing. Amazingly, the last photo shows what I have to replace. About...

Very nice post Brock. Thanks for sharing.

I had to remove a section of heat shrink where throttle goes. Put heaters on top of heat shrink. Rode 4 hours at -10F today. Riding on trails I ran heaters on low today. Much improved. Same general idea as the cork but a little cheaper. One meter of 25mm heat shrink was 5 bucks.

I pulled off the heaters and put 25mm heat shrink over the entire handle bar.

No heating element out where my pinky finger rides.

I think you could easily pull 10-70's. EPI belly buster 10-70's are the same exact profile as your 10-66's heel to tip. I bought my EPI's off Amazon on seller discontinue for about half price of the Polaris 10's.

Daniel, did you make changes and run against that 850 doo again?