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Author Topic: CB350/450 twin tach ratio?  (Read 441 times)

Offline scott s

  • Posts: 767
CB350/450 twin tach ratio?
« on: Nov 27, 2012, 07:28:52 »
 Does anyone know the tach ratio on the CB350 and 450 twins?

Offline djelliott

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Re: CB350/450 twin tach ratio?
« Reply #1 on: Nov 27, 2012, 11:01:37 »
1:7
71 CL350 Cafe build thread.
http://dotheton.com/index.php?topic=13543.0

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Offline BriMed1983

  • Posts: 161
CB350/450 twin tach ratio?
« Reply #2 on: Nov 27, 2012, 12:20:40 »
I concur,  its 1:7 
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Offline scott s

  • Posts: 767
Re: CB350/450 twin tach ratio?
« Reply #3 on: Nov 27, 2012, 20:49:36 »
 I got this info from the FAQ over at SOHC4.net:

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
 
 I'm guessing the 1:7 (or 7:1) is about the same as the 20:3? I've read somewhere that it's actually 6.67:1 and most people round it off to 7:1.

 That kind of sucks, because I plan on swapping a complete 650 engine into my '71 CB500/4 and I was hoping the twins had the correct ratio for the 650 cam/tach drive. I'd really like to keep my small, early guages.
 Guess I'll have to look for a pair of matching 750 gauges or something aftermarket.