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SOHC.co.uk Forums => CB500/550 => Topic started by: bobv7 on June 14, 2020, 08:11:27 AM

Title: Rev counter
Post by: bobv7 on June 14, 2020, 08:11:27 AM

Can any of the Learned Members tell me what the rev counter should be reading in top gear at a selection of normal road speeds? I'm assuming that my bikes' gearing is standard. Cheers. :)

Title: Re: Rev counter
Post by: deltarider on June 14, 2020, 01:23:27 PM

Depends, CB500 or CB550? For a CB500 it is real simple. Final drive ratio is 2,0. In 5^th gear:
  80 km/h = 4000 rpm,
100 km/h = 5000 rpm,
120 km/h = 6000 rpm,
140 km/h = 7000 rpm,
160 km/h = 8000 rpm.
Don't you love the decimal system?  ;)
For a CB550 it's different and the CB550K3 on the European continent is different to the K3 in other markets as it had a 34T rear sprocket where other models had 37T.

Title: Re: Rev counter
Post by: bobv7 on June 14, 2020, 02:59:02 PM

Cheers mate, so now I'm wondering where to get a rev counter serviced! :(

Title: Re: Rev counter
Post by: SteveD CB500K0 on June 14, 2020, 03:35:26 PM

He does indeed. Even sourced a spare part (from Ash) for mine.

Excellent job.


Sent from my iPhone using Tapatalk

Title: Re: Rev counter
Post by: peterengland on June 20, 2020, 03:21:49 PM

why kmh?
Looked at mine today
30mph = 2500
40mph = 3000
50mph = 4100
didn't go above 50 today....

Title: Re: Rev counter
Post by: bobv7 on June 20, 2020, 07:08:14 PM

I seem to remember that speedo and tacho dials used to be set up so in top the needles were always at the same angle in top to make them easier to read. I'll have to check that when I next take the bike out.

Title: Re: Rev counter
Post by: Bryanj on June 20, 2020, 07:13:00 PM

All depends on harshness of right hand twist and degree of clutch slip.

To qualify that my original 500 in the 70's would start the clutch sliping on takoff ocasionally and if i kept the revs up would carry on till i eased off in top at max legalish speeds.

Never actualy wore out though.