SOHC.co.uk Forums > CB500/550

Revs /mph

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Johnny4428:
Hi, Just had a good run on the K3 apart from losing the trim off one side of my tank, only to find it run over several times on the return journey. That aside I stated previously that I thought that I was at 60mph at 4000rpm and that is exactly what my clocks are telling me. I will check my sprockets and see what they are, but I have no way of telling if the clocks are accurate.

bobv7:
Well thanks to the info received I've calculated that if I multiply my rev counter reading by 1.3333 it will be correct.

That is 60mph @ 3000rpm in top x 1.3333 gives a true reading of 3999.9rpm.

I'm sure that must mean something significant about the gearing inside the rev counter head, and I dunno how it helps but it was something to ponder on rainy day. ::)

davidrsmith:
Hi,
I own a 1977 CB550K3 which was originally registered in the US.
At 4000 revs in top gear it is doing 50mph.

Dave

robvangulik:

--- Quote ---I will check my sprockets and see what they are, but I have no way of telling if the clocks are accurate.

--- End quote ---
GPS? :D

JezzaPeach:
Just spotted this slightly old thread.
I wanted to check my newly damped tacho and nearly bought an optical tacho for £10 but there is a strobe phone app called Strobelight where you can set the rpm at say 2000 and then shine the phone light on the timing nut and play with the revs around 2000 until the nut appears stationary.
I’ve only tried it briefly but mine shows about 2,300 on the tacho at 2,000 on the strobe.
At about 5,000 on the tacho my Speedo reads about right anyway. I think if I set the strobe for say 1,000 the tacho would be about 1,300, which I will check sometime.
Slightly fiddly but cost £0!

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