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I want to gear from my stock 19/35. I was thinking either 20/35 or 21/35. I want a lot of bottom end spunk. What would be a better choice? How much of a differance would there be between the two?
 

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Other way, 18/35. And Unless you have a good track you won't want to gear it down too much or you will just trench all the time.

Edit: I thought stock was 20 on those sleds? I could be wrong though.
 

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^correct. Adding a tooth to the top gear will kill your acceleration, but raise your top speed.

I would only drop one tooth (to 18/35) unless you have studs then you should be able to do 17/35 (but then you need a shorter chain). --->this is for hardpack conditions<---
 

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do you have enough chain to go to a 36-37 bottom gear?
 

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We are running 19/36 in my Dad's '90 Indy 500. Plenty of chain if it is stock length. Below is the set-up used in that sled for fast trail use.

Polaris gold primary spring 100/275. For higher engagement, EPI white 120/280 (adds approx. 200 rpm to engagement) or black 145/280 (adds approx. 400 rpms to engagement).
Polaris #10 bushed weights
42/34 full progressive helix
HSP white secondary spring #2 position
19/36 gears (much quicker)
The clutching and gearing changes made it a great sled on the trails for a sled with 72 HP. Also went 1 size smaller on the main jets and 1 notch leaner on the needles. Still safely jetted for most riding.
 
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