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Vintage Honda Owners,
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CB72 Speedometer & Tacho
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dowdesap
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Joined: 11 Nov 2018
Posts: 6
Location: Co Armagh

PostPosted: Sun Nov 25, 2018 5:14 am    Post subject: CB72 Speedometer & Tacho Reply with quote

Hi all, I'm new to this forum and have just (through a series of fortunate events) re-purchased a 1967 CB72 I owned in the late 70s. Its been fully restored but the Speedo/tacho isn't the one that was in the bike previously. My recollection was both needles moved clockwise but it now has a clockwise / anticlockwise head. If anyone is familiar with these variants, can I ask:

1. When did the head change from the clock-wise, anti-clockwise arrangement to the clockwise/clockwise as in the original CB450?

2. Does this also mean that the front wheel speedo drive is also different?

Any help greatly appreciated - and of course if anyone has a clockwise/clockwise head for sale, I'd be really interested!
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DJM
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Joined: 09 Oct 2003
Posts: 344
Location: Chesterfield UK

PostPosted: Sun Nov 25, 2018 6:47 am    Post subject: Speedometer change Reply with quote

Speedometer changed at Engine number CB77E 1001731 to the CB450 style instrument where both needles moved clockwise.

The speedometer drive gearbox changed at the same time.

I'd guess that sometime after you parted with the bike the speedo or tacho failed and was replaced with the (much more common) earlier type.

If your speedo works OK you must also have the earlier drive gearbox fitted.

If you find the correct late model tacho/speedo you'll definitely need the later drive gearbox to go with it.

Easy to overlook but the speedometer CABLE actually changed at the same time to one wound in the opposite direction!

Running the speedometer with the wrong cable can lead to problems with erratic readings.
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LOUD MOUSE
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Joined: 15 Aug 2005
Posts: 7629
Location: KERRVILLE, TEXAS

PostPosted: Mon Nov 26, 2018 7:04 am    Post subject: Re: Speedometer change Reply with quote

As you say you have a CB72 the speedo box changed at CB72F-1003907 and so did the cable and speedo. .................lm

DJM wrote:
Speedometer changed at Engine number CB77E 1001731 to the CB450 style instrument where both needles moved clockwise.

The speedometer drive gearbox changed at the same time.

I'd guess that sometime after you parted with the bike the speedo or tacho failed and was replaced with the (much more common) earlier type.

If your speedo works OK you must also have the earlier drive gearbox fitted.

If you find the correct late model tacho/speedo you'll definitely need the later drive gearbox to go with it.

Easy to overlook but the speedometer CABLE actually changed at the same time to one wound in the opposite direction!

Running the speedometer with the wrong cable can lead to problems with erratic readings.
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dowdesap
honda305.com Member


Joined: 11 Nov 2018
Posts: 6
Location: Co Armagh

PostPosted: Mon Nov 26, 2018 12:45 pm    Post subject: CB72 Speedometer & Tacho Reply with quote

Many thanks. Appreciate the quick response!
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LOUD MOUSE
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Joined: 15 Aug 2005
Posts: 7629
Location: KERRVILLE, TEXAS

PostPosted: Mon Nov 26, 2018 1:12 pm    Post subject: Re: CB72 Speedometer & Tacho Reply with quote

You are welcome. ..................lm

dowdesap wrote:
Many thanks. Appreciate the quick response!
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Robetto
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Joined: 11 Dec 2018
Posts: 2

PostPosted: Wed Dec 12, 2018 2:43 am    Post subject: Reply with quote

I am very pleased to have come.
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revlover
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Joined: 12 Jul 2015
Posts: 159
Location: Louisville, KY

PostPosted: Thu Dec 13, 2018 9:03 am    Post subject: Reply with quote

Sorry, Robetto this is not a porn site.
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