Here Are The Turbo Steering Stem Dimensions

Update your forks and brakes to match the performance

Here Are The Turbo Steering Stem Dimensions

Postby M6NTL » Sun Nov 09, 2008 9:49 pm

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There is an error in the drawing below. The Internal Thread in the top is 14mm NOT 12mm
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Peeps,
I have measured and drawn the Turbo's steering stem, diagram in GIF format herewith...

Image

:wink:
Last edited by M6NTL on Thu Apr 16, 2009 3:12 pm, edited 1 time in total.
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Postby Turbo Ghost » Sun Nov 09, 2008 11:29 pm

What would be the best material for making one? High-carbon steel? Not that I need one right now but, maybe someday........
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Material

Postby M6NTL » Mon Nov 10, 2008 8:14 am

For spindles and shafts and the like I always plump for EN24T steel...

:-)
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Postby Lorcan » Mon Nov 10, 2008 8:18 am

Nice one Mark 8)
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Postby Mavrik » Mon Nov 10, 2008 7:09 pm

Turbo Ghost

I make mine out of stainless. Seems to be cheap around here as no one really uses it locally.
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Postby tack1000 » Mon Nov 10, 2008 9:04 pm

Hi

En24 T is a good choice, although En16 T has all the strength of En24 T with a slightly better ductility figure. This is better for axles and spindles as it can flex more without cracking. That’s not to say En24 T will snap, but 16 is a little better and was designed for this type of application.

Each to there own, just my 10 pence worth.


It is a little cheaper and more available too :wink: .


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Postby Mavrik » Wed Nov 12, 2008 5:02 am

What's that cost you over there Jeff??
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Re: Here Are The Turbo Steering Stem Dimensions

Postby Bigredzed » Wed Apr 08, 2009 7:36 pm

Hi Everyone,
I have been out of engineering so long now that I have forgotten what tolerances to make the shaft where the bearings fit.
I know someone will know.
Thanks
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Re: Here Are The Turbo Steering Stem Dimensions

Postby tack1000 » Wed Apr 08, 2009 8:07 pm

Hi

I would make
the 28 28.01-28.02
the 25 24.98-24.97
the 23 would depend on the top yoke, but lets take it the hole was 23 the the stem would be 22.98-22.96 as it need to move when adjusting the top bearings.
the fit into the base yoke would be up on hole size 0.02-0.03. it should be a 2 to 3 ton press fit back into the base yoke.

IMHO.

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Re: Here Are The Turbo Steering Stem Dimensions

Postby Bigredzed » Wed Apr 08, 2009 10:07 pm

Thanks for the quick answer.
Just got to draw one up to suit USD forks then visit the places where I used to work (if the credit crunch hasn't put them out of business). I know a few of them were struggling. One of the reasons why I escaped the industry.
Whats a reasonable price to pay for the work?
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Re: Here Are The Turbo Steering Stem Dimensions

Postby M6NTL » Thu Apr 16, 2009 3:14 pm

Anyone using this diagram to make a stem PLEASE NOTE I made a small mistake. The Internal Thread in the top of the stem is 14mm NOT 12mm as per the drawing...

Oops...

:oops: :? :(
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Re: Here Are The Turbo Steering Stem Dimensions

Postby georgew4714 » Fri Sep 22, 2017 10:54 am

Does anyone have a copy of this drawing ?

The image is no longer here :(
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Re: Here Are The Turbo Steering Stem Dimensions

Postby tack1000 » Sat Sep 23, 2017 5:57 pm

I do have it home, but am away for a birthday treat.

On my return I'll post it up
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Re: Here Are The Turbo Steering Stem Dimensions

Postby ThePolishPrince » Tue Feb 18, 2020 3:26 pm

Hi all,
I've been absent for a LONG time from this forum, and someone asked me for a drawing of what I did to install ZRX 1100 forks on my 750 turbo. Here is the drawing from that. I never saw the original picture in this thread, so I don't know the dimensions. Check and re-check.
Attachments
Turbo_Stemjpg2.gif
85 GPz750 Turbo in progress, 99 ZZR1100D in progress, 99 ZRX1100 modded, 03 ZRX1200 turbo, 76 Z900 turbo, 87 H*nda 600F1 modded, 95 Ducati 916S, 94 Ducati 900SS, 75 Ducati 860gt, 85 Moto Morini 500 Sei
One day I hope to own a motorcycle from this century.
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Re: Here Are The Turbo Steering Stem Dimensions

Postby Eckhard » Tue Feb 18, 2020 4:37 pm

There is no dimension for the internal bore but having noted this, it begs the question if the bore is actually necessary.
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