Speedo gearbox question

specifications, colours, contract nos, variations etc
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nevhunter
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Re: Speedo gearbox question

Postby nevhunter » Mon Oct 15, 2018 1:35 am

The speed reading and the ODOmeter reading are in the correct relationship. Is this a front wheel drive set up? There's less to be out with the front wheel driven unit. Nev

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simon.holyfield
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Re: Speedo gearbox question

Postby simon.holyfield » Mon Oct 15, 2018 7:08 am

nevhunter wrote:The speed reading and the ODOmeter reading are in the correct relationship. Is this a front wheel drive set up? There's less to be out with the front wheel driven unit. Nev


Yes, it's my W/NG Nev. I'll need to be counting turns and teeth next time I have the front wheel off.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'78 CX500
http://ariel-square-four.blogspot.com

nevhunter
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Re: Speedo gearbox question

Postby nevhunter » Mon Oct 15, 2018 11:56 am

Do you know the correct gears? I've been working on a couple lately and can tell you details I would be surprised if anything but he correct ones will fit the threaded hub and mesh correctly . I will be giving mine more love than previously I neglected the open ones and wrecked both. I'll be greasing them about every 2,000 miles at the most from now on. Nev

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simon.holyfield
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Re: Speedo gearbox question

Postby simon.holyfield » Mon Oct 15, 2018 12:50 pm

I'd appreciate you summarising the gear teeth and the gearbox ratio as you see it Nev. I know that I have 14 teeth on the small gear (I have a picture of it) but anything else will need it to come apart.

The W/NG is my only running bike while I search for the misfire on my SQ4.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'78 CX500
http://ariel-square-four.blogspot.com

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alan.moore
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Re: Speedo gearbox question

Postby alan.moore » Mon Oct 15, 2018 5:50 pm

simon.holyfield wrote:I'd appreciate you summarising the gear teeth and the gearbox ratio as you see it Nev. I know that I have 14 teeth on the small gear (I have a picture of it) but anything else will need it to come apart.

The W/NG is my only running bike while I search for the misfire on my SQ4.


Simon,
See my earlier post in page two of this topic. Looks like you may also have a gearbox with an 8 tooth/14 tooth gear set .
Cheers
Alan
1939 VH Redhunter;1942 RN WNG;1951 Triumph 6T Thunderbird;1970 BSA B175 Bantam;1986 Yamaha SRX600 single
http://cloggymoore.wix.com/triumph-pre-unit-6t

nevhunter
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Re: Speedo gearbox question

Postby nevhunter » Tue Oct 16, 2018 5:20 am

I have just checked 3 different W/NG front wheels and the 14 /43 external gears and the internal ratio of 8: 12 as per Alan's post is confirmed. so the 12 % error may be expected, if the speedo itself is the same. Nev

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simon.holyfield
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Re: Speedo gearbox question

Postby simon.holyfield » Mon Nov 26, 2018 7:17 pm

Alan,

Did you ever get this resolved? I'm thinking we are both looking for 8:12 speedo drive gears?
Last edited by simon.holyfield on Sat Mar 30, 2019 6:22 pm, edited 1 time in total.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'78 CX500
http://ariel-square-four.blogspot.com

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alan.moore
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Re: Speedo gearbox question

Postby alan.moore » Mon Nov 26, 2018 7:41 pm

Yup all sorted (I hope) I bought one from Reins on the forum. I can confirm the one he sent me has a 8:12 ratio. Compared with what is being asked for these drives on Ebay his was a reasonable price. I believe he had two so maybe he has another to sell. Will PM you

Cheers
Alan
1939 VH Redhunter;1942 RN WNG;1951 Triumph 6T Thunderbird;1970 BSA B175 Bantam;1986 Yamaha SRX600 single
http://cloggymoore.wix.com/triumph-pre-unit-6t


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