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rake of K vs KH

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suicideshovel65

Posts: 217

Joined: Thu Feb 10, 2005 1:01 am

Location: Palo Alto, CA

Post Wed Apr 30, 2008 12:51 pm

rake of K vs KH

Hi everyone,

I am guessing that the -52 neck casting has less rake than the -52A casting, and was wondering if the lower fork clamps & stem were also this way?

I have heard that flattrack racers like to use the -52 part - was this because it reduces the rake, or increases it to compensate for the rake built in to the neck casting?

Thankyou!
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thefrenchowl

User avatar

Posts: 584

Joined: Fri Mar 10, 2006 3:18 pm

Location: Crewe, Great Britain

Post Wed Apr 30, 2008 1:39 pm

Re: rake of K vs KH

Hi Suicide Shovel,

No, the 52/53 frame rake is the same as the 54/55 frame rake.

They changed the fork rake by modifying the top and bottom tree.

The 56 frame was in fact the same frame and angles with a bit of a goose neck to lower the whole frame by 1" in relation to where it was before.

I still have my 54 KHK original trees/forks, my bike is about 200 numbers after the rake change: They are actually K trees that have been factory moded to the new fork angle by welding... Morality, H-D didn't throw anything away, it can always be moded!!!!!!!!!!

Patrick
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suicideshovel65

Posts: 217

Joined: Thu Feb 10, 2005 1:01 am

Location: Palo Alto, CA

Post Wed Apr 30, 2008 1:58 pm

Re: rake of K vs KH

Thanks Patrick, so do the earlier trees reduce the rake?

BTW from examining two 53 frames, I can conclude that the change to the 52A neck casting was made early to mid-53. The 52-early 53 frames have no date code, and an upper engine mount with a -52 casting number that is absent in the mid-53 frames onwards. The very early frames seem also to have very crisply defined casting numbers.
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thefrenchowl

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Posts: 584

Joined: Fri Mar 10, 2006 3:18 pm

Location: Crewe, Great Britain

Post Wed Apr 30, 2008 2:04 pm

Re: rake of K vs KH

Hi again!!!

My tired brain still have difficulty in differentiating rake and trail!!!!

The earlier forks have less trail and more rake. The later ones have more trail ans less rake!!!

Yes, the more recent they are, the uglier the castings... The late 70s Sportster's ones really take the bisquit on that account...

Patrick
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suicideshovel65

Posts: 217

Joined: Thu Feb 10, 2005 1:01 am

Location: Palo Alto, CA

Post Wed Apr 30, 2008 2:08 pm

Re: rake of K vs KH

thanks again Patrick! So I'm thinking the set with more rake will be more stable for high speed use...
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thefrenchowl

User avatar

Posts: 584

Joined: Fri Mar 10, 2006 3:18 pm

Location: Crewe, Great Britain

Post Wed Apr 30, 2008 2:21 pm

Re: rake of K vs KH

No, more trail is more stable... So later geometry is more stable, but less easy to flick about...

patrick

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