SOHC.co.uk Forums > CB500/550
Revs /mph
philward:
--- Quote from: bobv7 on July 18, 2020, 05:54:51 PM ---The reason I ask is because I bought an after market matching speedo and tacho. The speedo looks like it's reading pretty close as they usually work off front wheel diameter anyway but I'm not so sure about the rev counter, but since I'm not going be red lining the bike every where it's not so important. There is a marking on the rev counter dial reading 1:4 so maybe it was intended to fit a twin and actually showing half the true rpm?
--- End quote ---
I fitted a pair of aftermarket matching rev counter/speedo to my 750 K2 just after I rebuilt it (while I was refurbing the original clocks) and the the rev counter read about a 1000 rpm high at 60mph
bobv7:
Anything like these?
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philward:
No, they where CB750K replica's (almost identical to the original's to the non expert)
Johnny4428:
That is interesting on the proper gearing numbers. I didn’t get out on the bike yesterday not weather in the morning so decided to fit new fork seal that seemed to be leaking. (Can’t believe somebody put the one seal upside down) ooops!🤭🤫! I am now starting to doubt myself with mph/rpm, wouldn’t be the very first time I have been wrong.😂
bobv7:
Riding the bike this morning and the rev counter was reading 3000 rpm at 60 mph. Obviously this set up is not a direct replacement for the standard one but it would be interesting to see if anyone can spot a relationship between the readings? I thought the rev counter might be reading half speed but not sure that matches up with what others are quoting. Ideas?????
If you missed it this the set up!
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