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UH Gearing

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edbbob

Posts: 5

Joined: Sat Jul 01, 2006 6:59 am

Location: Copenhagen

Post Mon Aug 07, 2006 8:28 am

UH Gearing

After driving 5000 km in 3 weeks, I found out that highways isn't that bad after all. But when i run at 110 km/h the engine rews a little more than I think it should, and therefore I was thinking about changing the gearing. I run with a standard 22 teeth sprocket now.

Any experiences and/or suggestions? 24, 25 or 26 teeth?

Thanx

Edbbob :)
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Chris Haynes

Posts: 2623

Joined: Wed Jul 05, 2000 12:01 am

Location: Los Angeles, CA

Post Mon Aug 07, 2006 9:46 am

Are you asking about the engine or transmission sprocket?
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krazy loop

Posts: 646

Joined: Sat Jul 31, 2004 12:01 am

Location: Detroit

Post Mon Aug 07, 2006 6:09 pm

24/24 is nice all the way around.
New Knuckleheads? Thank, you, Jesus!!
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44u

Posts: 304

Joined: Mon Apr 19, 2004 12:01 am

Location: oklahoma usa

Post Mon Aug 07, 2006 11:04 pm

I've run a 23T engine sprocket and 25T transmission sprocket for years with no problems. Dropped the rpms dramatically and thanks to flathead torque will even take off in 3rd gear from a dead stop.
(Keep an eye on the rear chain adjustment; the 25T gets pretty close to the oil tank. I rigged up a small nylon shoe to act as a guide and prevent flopping in this area.)
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edbbob

Posts: 5

Joined: Sat Jul 01, 2006 6:59 am

Location: Copenhagen

Post Tue Aug 08, 2006 1:37 am

Thanks guys :)

Gotta be carefull not to chop holes in the oil tank. I need that one!

Is there any difference, wether I gear on the engine sprocket or the transmission sprocket?
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BREWSKI

Posts: 919

Joined: Sat Mar 27, 2004 1:01 am

Location: RENO,NV. U.S.A.

Post Wed Aug 09, 2006 7:00 pm

KRAZY LOOP,I concur that's what we used to run years ago,there's no reason it shouldn't work now. BREWSKI
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Frankenstein

User avatar

Posts: 1547

Joined: Thu Jun 27, 2002 12:01 am

Location: Interlaken, NY USA

Post Sun Aug 13, 2006 7:26 pm

23/25 and 24/24 are almost exactly the same, 3.27:1 for 24/24, 3.28:1 for 23/25. Assuming a present engine sprocket of 23T and tranny is 22, your present ratio is 3.72:1. If you've a 24T engine, it's 3.57:1. You're really going to have to change the countershaft sprocket to get it geared up to a nice cruising RPM range.
Just my .02 worth.
Dr. Dick

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