Alternative for changing gear ratio?
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Road Captain
Joined: Sep 2006
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Alternative for changing gear ratio?
I found this today
SCREAMIN’ EAGLE RACE USE PRIMARY GEARING KIT
This is the kit that will help you get the holeshot at the race track. This kit increases vehicle acceleration by allowing the engine to spin higher RPM at any given vehicle speed. This new combination results in a 1.7:1 primary drive ratio, versus the stock 1.44:1 ratio. Requires separate purchase of Primary Cover Gasket Kit includes 21 tooth compensator (25 tooth is stock) sprocket and primary chain. For race application only. Fits '94-'06 Touring models ('99-'01 fuel-injected models require 36 Tooth Clutch P/N 37707-98A).
Listed as $134.95. That's alot cheaper than changing the drive belt pulley. That's around $400 for paarts if I remember right. Where does the speedo drive from? Maybe that's why this is listed as race only.
SCREAMIN’ EAGLE RACE USE PRIMARY GEARING KIT
This is the kit that will help you get the holeshot at the race track. This kit increases vehicle acceleration by allowing the engine to spin higher RPM at any given vehicle speed. This new combination results in a 1.7:1 primary drive ratio, versus the stock 1.44:1 ratio. Requires separate purchase of Primary Cover Gasket Kit includes 21 tooth compensator (25 tooth is stock) sprocket and primary chain. For race application only. Fits '94-'06 Touring models ('99-'01 fuel-injected models require 36 Tooth Clutch P/N 37707-98A).
Listed as $134.95. That's alot cheaper than changing the drive belt pulley. That's around $400 for paarts if I remember right. Where does the speedo drive from? Maybe that's why this is listed as race only.
Extreme HDF Member
Joined: Apr 2006
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From: Roswell, GA
RE: Alternative for changing gear ratio?
My service manager told me the 21 tooth sprocket and chain kit was originally introduced for touring bikes with sidecars when HD went with the 3.15:1 final drive in 2002; haven't checked to see if this is accurate or not.
It will definitely give you a "holeshot" but it will also give you a final drive of ~3.75:1 which adds about 800 rpm at 70 mph.
There is no change to the speedo when changing the primary drive gearing.
It will definitely give you a "holeshot" but it will also give you a final drive of ~3.75:1 which adds about 800 rpm at 70 mph.
There is no change to the speedo when changing the primary drive gearing.
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Road Captain
Joined: Sep 2006
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RE: Alternative for changing gear ratio?
I saw this done in an issue of American Iron I think, seems easier than doing the final drive belt. You don't have to mess with the belt tension. The chain tension is easier to do, IMO. The article did an after market brand though. This seems like a good way to go.
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Johnni Sahlmann Pedersen
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Dec 24, 2013 05:16 AM
