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Tacometer Ratio

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Tacometer Ratio

Postby pierodn » Fri Dec 02, 2016 1:53 pm

Please,
i have a RSM 3003/06, 3 TO 1 Ratio, 10,000 rpm.
Is it correct for P11 or what is the stock one?.
Thank you.
Piero

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Re: Tacometer Ratio

Postby L.A.B. » Fri Dec 02, 2016 2:41 pm

pierodn wrote:RSM 3003/06, 3 TO 1 Ratio, 10,000 rpm.
Is it correct for P11 or what is the stock one?.



According to my Smiths list, RSM 3003/06 was fitted to various 1965-69 BSA B44, A50 and A65 models.

RSM 3003/00 (8,000 RPM, 2:1 clockwise drive) for 1968 N15, N15CS, 650SS, Atlas, 1969 Mercury and P11A Ranger with a BG 1508/05 1:1 reversing drive gearbox.
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Re: Tacometer Ratio

Postby pierodn » Sat Dec 03, 2016 12:38 am

Hi Les,
Thank you.
Piero

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Re: Tacometer Ratio

Postby pierodn » Thu Dec 15, 2016 1:06 pm

L.A.B. wrote:
pierodn wrote:RSM 3003/06, 3 TO 1 Ratio, 10,000 rpm.
Is it correct for P11 or what is the stock one?.



According to my Smiths list, RSM 3003/06 was fitted to various 1965-69 BSA B44, A50 and A65 models.

RSM 3003/00 (8,000 RPM, 2:1 clockwise drive) for 1968 N15, N15CS, 650SS, Atlas, 1969 Mercury and P11A Ranger with a BG 1508/05 1:1 reversing drive gearbox.


Hi Les,
I'm looking for one to buy but I haven't found it yet.
If in the while I use that of the BSA ratio 3 to 1 what would corresponde 1000 rpm?
Thank you.
Piero

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Re: Tacometer Ratio

Postby L.A.B. » Thu Dec 15, 2016 2:08 pm

pierodn wrote:If in the while I use that of the BSA ratio 3 to 1 what would corresponde 1000 rpm?


If I have worked it out correctly, a 3:1 rev counter connected to a 2:1 drive would read 50% fast.
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Re: Tacometer Ratio

Postby pierodn » Fri Dec 16, 2016 12:33 am

L.A.B. wrote:
pierodn wrote:If in the while I use that of the BSA ratio 3 to 1 what would corresponde 1000 rpm?


If I have worked it out correctly, a 3:1 rev counter connected to a 2:1 drive would read 50% fast.

Hi Les,
thank you.
It means that i will have 1000 rpm reading 500 rpm?.
Ciao
Piero

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Re: Tacometer Ratio

Postby L.A.B. » Fri Dec 16, 2016 3:42 am

1000 RPM + 50% = 1500
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Re: Tacometer Ratio

Postby pierodn » Fri Dec 16, 2016 9:07 am

Hi Les,
Thank you.
Piero

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Re: Tacometer Ratio

Postby kommando » Wed Dec 21, 2016 8:41 am

According to my Smiths list, RSM 3003/06 was fitted to various 1965-69 BSA B44, A50 and A65 models.


Smiths list is wrong, B44 tacho is 4:1. They corrected the error for 1970, the tacho drive was first fitted in 1969 to B44 and B25 and other than a change to the method of attaching the cable remained the same until the end of the B50 in 72/73.

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Re: Tacometer Ratio

Postby pierodn » Sun Jan 22, 2017 1:29 pm

Hi All.
I have a grey face 190 Km/h (top speed) speedometer n. 3001/01A but i cannot recognize what bike mounted.
Do you know, please, and what is the gear box drive?
Thank you.
Piero

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Posts: 1996
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Location: Gaeta Italy

Re: Tacometer Ratio

Postby L.A.B. » Sun Jan 22, 2017 3:24 pm

pierodn wrote: I have a grey face 190 Km/h (top speed) speedometer n. 3001/01A but i cannot recognize what bike mounted.


Km/h SSM 3001/01A was used on various mid-to-late 60s Matchless and Norton models (mostly twins) including 99, 650, Atlas, N15 etc.



pierodn wrote: and what is the gear box drive?


With the exception of the G80CS it was BG5330/257 which is 2:1, reversing.
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Re: Tacometer Ratio

Postby pierodn » Mon Jan 23, 2017 12:29 am

Hi Les,
thank you.
Piero

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