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Low gearing advice

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Danbot

Well-known member
Nov 29, 2007
1,696
967
113
Alberta, Canada
So with gearing down, Is there any clutching mods that need to be done? Shouldn't be cause you're not effecting clutch operation, only where the belt rides at a given speed, right?
Looking at going 19/45 or 46 on a 2012 800 with stock drivers/track.

You also get a much lower starting ratio, less load on the clutches, and your helix will stay in the second angle (instead of constantly flipping back and forth from the starting angle to the second, as they seem to do in the trees at stock ratio)

Ive never got quite as low as 19/46 previously, but in my experience (900RMK) it has been necessary sometimes to throw extra weight at the primary when gearing down... a great opportunity to change to some heel heavy weights.
I've only been playing with 800CFI clutching since I bought a new PRO in 2013, but they seem to like being loaded through the midrange instead of flashing up to 8100+. Achieving this with 19/46 is going to take some adjustment I think. My plan is a set of Dalton adjustable weights, and go from there. I'm excited to see what I can extract through gearing from this 15 STD, it was a loooong summer after my 13 was stolen in feb.

Just my experience, I'm certainly not a clutching expert. I would love to hear other opinions... maybe a helix change would work as well, or better?
 
T

Trenchmaster

Well-known member
Nov 26, 2007
960
162
43
Edmonton, Alberta
My favourite result from gearing down is that I rarely have to touch my brakes going down steep slopes, keep the clutches engaged and just idle down. Makes for a much more controlled descent.
 
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RMKNV

Member
Jan 3, 2011
82
9
8
59
Reno,NV
I'm running 19-43 with the stock chain and MDS adjustable weights. I like the set up, it pulls great and I agree with trenchmaster on the down hill compresion braking. Nice set set up and simple, cheap power to the track.
 
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fullboredragon

Well-known member
Mar 24, 2009
91
49
18
42
I got the 20/46 with the 76 pitch chain. Seems awfully loose, the tensioner is almost used up to get it snug. Is that right? If that's the case I think I'm going to 19 on the top with a 74 chain if the 74 doesn't work with the 20...
 
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Danbot

Well-known member
Nov 29, 2007
1,696
967
113
Alberta, Canada
Finally pickup my snowcheck on friday, I'm still on crutches from knee surgery but I'll probably get to installing the 19/46 within a week here... I'll take pics of the clearance and tensioner position.
 
K
May 10, 2009
134
25
28
Calgary, AB
20-46 works with the 74 pitch chain. Frustrating at first to align the gears with the chain. It is a tight fit. Very efficient setup.

RPM is more consistent and the downhill engine braking is worth every penny.

Remember gearing down makes your primary weights heavier. If you are going 19-46 make sure to drop a couple grams.
 
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fullboredragon

Well-known member
Mar 24, 2009
91
49
18
42
20-46 works with the 74 pitch chain. Frustrating at first to align the gears with the chain. It is a tight fit. Very efficient setup.

RPM is more consistent and the downhill engine braking is worth every penny.

Remember gearing down makes your primary weights heavier. If you are going 19-46 make sure to drop a couple grams.

Really? Can u explain how it requires less weight in my mind it would be the other way if anything..

I'm going to try run the 74 on a 20/46. Ill report back.

Thnx
 

mendelmiles

New member
Lifetime Membership
Mar 4, 2011
33
1
8
East central SD
So it looks like stock is 20-41 with a 2.05 ratio right? If I go with 20-45 I should go to a 2.25 ratio which would work well for what I do. Will I be able to do this with stock chain? And should I clutch any different?:noidea:
 
D

Danbot

Well-known member
Nov 29, 2007
1,696
967
113
Alberta, Canada
I highly doubt you can add 4 teeth to the lower gear on the stock chain. Find a gearing chart for the pro ride chassis to see what combos work with the stock chain.

I will no longer be able to test / fit my 19/46 combo, my sled was stolen from the dealership pre-delivery... sounds like I'll end up with a quick drive sled for a replacement.
 
K
May 10, 2009
134
25
28
Calgary, AB
Stock gearing is 20-42. The stock chain will not fit 20-45. If you are going to buy a gear go with the largest bottom you can fit. Your going to need to buy a chain anyways. 19-46 seems popular. I am running 20-46 with the 74 pitch chain.

Your clutching will be very close. Tweak a couple grams less IMO.
 
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fullboredragon

Well-known member
Mar 24, 2009
91
49
18
42
I got my 20/46 installed with the 74 pitch chain, she's snug but not too tight. Took it for a run with 66 g weights and stock clutching at 2000' running a 13.1 par head in the eth setting for break in, I was pulling 8000. on the 91 setting 8200
 
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