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#717769 - 12/05/17 12:03 pm BSA A7SS/A10 Tach Drive Direction?  
Joined: Apr 2015
Posts: 329
Peter Gee Offline
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Peter Gee  Offline
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Joined: Apr 2015
Posts: 329
Kenya
Hi does anyone know if the BSA A7SS (I suppose the A10 too) tach drive offtake is CCW or CW- lockwise.

I am looking at a Smits Chrono Tach RC 1370/01 which is Triumph one and CCW, but could as well fit BSA if the rotational direction is the same?

Surely all Chrono tachs work at 2:1 ratio to engine speed ?

Thanks and Happy Xmas

Peter in Africa

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#717784 - 12/05/17 3:18 pm Re: BSA A7SS/A10 Tach Drive Direction? [Re: Peter Gee]  
Joined: Jan 2004
Posts: 3,539
DMadigan Offline
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DMadigan  Offline
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Joined: Jan 2004
Posts: 3,539
ca, us
Looking at pictures of the A7, the magneto turns backward to the crank. The worm turning counterclockwise (looking at the timing side) pulls the drive gear counterclockwise (looking from the rear), so clockwise looking at the end of the tachometer cable.

#717789 - 12/05/17 3:47 pm Re: BSA A7SS/A10 Tach Drive Direction? [Re: Peter Gee]  
Joined: Mar 2011
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wak Offline
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wak  Offline
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Posts: 833
derby england
Yes clockwise , 2 to 1 tach with a 1 to 1 drive or 4 to 1 with the 2 to 1 drive (the most common)


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#717800 - 12/05/17 5:24 pm Re: BSA A7SS/A10 Tach Drive Direction? [Re: Peter Gee]  
Joined: Feb 2014
Posts: 369
chaterlea25 Online content
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chaterlea25  Online Content
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Joined: Feb 2014
Posts: 369
Cork Ireland
Hi Peter,
It depends on what year the BSA is and the location of the drive
Earlier engines have the drive taken from the magneto, later engines have the drive taken from the oil pump drive
the oil pump drive units are 3:1 ratio Left hand rotation they are rare and sought after
Good chronometric speedo refurbishers can build one from a donor speedo

John


Moderated by  Allan Gill, Jon W. Whitley 


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