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Author Topic: TACH Ratio  (Read 620 times)

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Offline Xnavylfr

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TACH Ratio
« on: August 25, 2013, 05:25:15 AM »
Does the CB550 and CB750 tach have the same internal gear ratio. The bike it is on is a 75 CB750F. When at idle, the engine labors just to idle but the tach shows 2k. When on the HI-WAY running 80 MPH the tach shows 9.5+K.


Xnavylfr(CHUCK)
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Offline david 750f

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Re: TACH Ratio
« Reply #1 on: August 25, 2013, 05:30:41 AM »
From the FAQ's.

CB750 Speedo  2240:60  Tach 4:1
CB650 Speedo  2240:60  Tach 4:1
CB550 Speedo  2240:60  Tach 20:3
CB500 Speedo  2240:60  Tach 20:3
CB400 Speedo  2240:60  Tach 20:3
CB350 Speedo  2240:60  Tach 20:3
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1976 CB 750F

Offline Xnavylfr

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Re: TACH Ratio
« Reply #2 on: August 25, 2013, 05:51:04 AM »
Thank you so much for that info!!I'll have to enter that in my memory!!


Xnavylfr(CHUCK)
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Offline 75CBCafe

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Re: TACH Ratio
« Reply #3 on: August 25, 2013, 11:43:25 AM »
+1 on the thanks. I was wondering what TACH I needed for a replacement.
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