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Pre-unit tach drive question #369917
04/24/11 11:50 pm
04/24/11 11:50 pm
Joined: Aug 2008
Posts: 1,435
Minnesota, US
Jim Hultman Offline OP
BritBike Forum member
Jim Hultman  Offline OP
BritBike Forum member
Joined: Aug 2008
Posts: 1,435
Minnesota, US
I've done a lot of searching on this, and even found a really old post by Mr. Whitley:
Originally Posted By: Jon W. Whitley
On page 14 of Replacement Parts Catalogue No.16, you will will find the part number of the tach drive timing cover, it's components and applications TR6 and T120. This is located in the Carton Pack List section of the book.
beerchug

My question is about the connection between the tach drive and the tach cable. I ordered a cable, but it came with the usual square ended cable. It appears that the tach drive is for a spade end. I've seen this setup before, but am not familiar with the Triumph version.

John was right that the parts list is on page 14 of the parts catalog. (By the way, thanks for that John. I searched and searched for that listing and couldn't find it! confused ) However, there doesn't seem to be a part that would connect the square cable end to the spade fitting on the drive.

I think my instruments are original.



Anyone know what I'm missing here?

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Re: Pre-unit tach drive question [Re: Jim Hultman] #369922
04/25/11 12:17 am
04/25/11 12:17 am
Joined: Aug 2001
Posts: 7,141
Vermont
Jon W. Whitley Offline

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Jon W. Whitley  Offline

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Posts: 7,141
Vermont
Jim,

Glad to be of service wink

I'll be able to check my cable on Tuesday evening...if you don't get an answer by then, I'll see what I can do.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Pre-unit tach drive question [Re: Jim Hultman] #369943
04/25/11 2:19 am
04/25/11 2:19 am
Joined: Oct 2003
Posts: 11,263
North Georgia, USA
RF Whatley Offline
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RF Whatley  Offline
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Posts: 11,263
North Georgia, USA
I believe that's the same part as used on all unit construction bikes with tach. It's probably changed part number 10 times since the pre-unit days, but the unit part might be the only one stocked now.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: Pre-unit tach drive question [Re: RF Whatley] #370098
04/25/11 10:35 pm
04/25/11 10:35 pm
Joined: Aug 2008
Posts: 1,435
Minnesota, US
Jim Hultman Offline OP
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Jim Hultman  Offline OP
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Joined: Aug 2008
Posts: 1,435
Minnesota, US
Originally Posted By: RF Whatley
I believe that's the same part as used on all unit construction bikes with tach. It's probably changed part number 10 times since the pre-unit days, but the unit part might be the only one stocked now.

Hadn't thought of that. Too simple! grin

So I took a unit spade drive and tried to fit it to the pre-unit:



It fits in the drive OK.



But either I have the wrong cable or I need a different spade drive. Not sure if any spade would work with this. Too much cable extruding from the sheath when then top of the cable is connected to the tach. I'm starting to think it's a wrong cable.

Re: Pre-unit tach drive question [Re: Jim Hultman] #370178
04/26/11 10:12 am
04/26/11 10:12 am
Joined: Jan 2005
Posts: 1,664
East Bethany New York
Dick Harris Offline
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Dick Harris  Offline
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Posts: 1,664
East Bethany New York
I just looked at one of mine and the metal part of the lower cable is about 1 1/2 inches long, above the nut.It appears the one you have is much shorter? That would give room for the spade shown in the picture. Dick

Re: Pre-unit tach drive question [Re: Dick Harris] #370844
04/30/11 1:29 am
04/30/11 1:29 am
Joined: Aug 2008
Posts: 1,435
Minnesota, US
Jim Hultman Offline OP
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Jim Hultman  Offline OP
BritBike Forum member
Joined: Aug 2008
Posts: 1,435
Minnesota, US
Originally Posted By: Dick Harris
I just looked at one of mine and the metal part of the lower cable is about 1 1/2 inches long, above the nut.It appears the one you have is much shorter? That would give room for the spade shown in the picture. Dick


Like this?



It takes the longer end to accept the spade drive. I dug around in the old cable box and came up with these. The new cable I ordered is evidently the wrong one.

I'm still confused. If you mount the cable sheath with the longer end over the spade drive, the little clip on the end of the spade would be trapped when you tighten the cable down. I think it might work without the clip, but it doesn't look right to me.

Does anyone know what differences there are between the unit tach cables and the pre-unit?

Re: Pre-unit tach drive question [Re: Jim Hultman] #370960
05/01/11 1:51 am
05/01/11 1:51 am
Joined: Aug 2001
Posts: 7,141
Vermont
Jon W. Whitley Offline

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Jon W. Whitley  Offline

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Joined: Aug 2001
Posts: 7,141
Vermont
Jim,

Here is my tach drive cable. It works great. I would think you need the clip.









Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Pre-unit tach drive question [Re: Jim Hultman] #371058
05/01/11 7:17 pm
05/01/11 7:17 pm
Joined: Aug 2008
Posts: 1,435
Minnesota, US
Jim Hultman Offline OP
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Jim Hultman  Offline OP
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Joined: Aug 2008
Posts: 1,435
Minnesota, US
Thanks Jon!

I've been poking around a bit on this question, and it seems that the unit Triumphs use the same setup. In fact, pretty much all the external tach drives I looked at, including the Enfield twin and the older Nortons, use the same style cable, with the extended end allowing for the spade drive. Also, the BSA and Triumph triples seem to use the long cable end. Didn't take them apart, but that must mean they use a spade drive.

The only bikes I looked at without the extended end, which obviously then use a direct square drive, were the BSA units and later Norton Commandos.

I'd never thought about this before. Now I'm wondering what cable I was sent, and it makes me wonder if there is a Triumph that uses the square drive instead of the spade drive. Curious.


Moderated by  John Healy 


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