SOHC.co.uk Forums > CB500/550
Help needed to identify my CB500-4
AshimotoK0:
--- Quote from: B11sey on February 02, 2023, 07:53:40 AM ---You’re right Oddjob. All the brightwork needs re-chrome or replacing. Luckily I bought a new set of pipes 30yrs ago which will save a lot.
However I’m not doing this for a profit but to relive some of the memories of the riding we did back in the day.
https://photos.app.goo.gl/GYFFBn9hnBEzJmyW8
--- End quote ---
Sounds like a great basis for resto. of a rare variant of the 500, particularly as you had the fore-thought to buy the genuine pipes. Always love genuine UK models.. yea I know there were all made in Japan and mine is a USA model but hey ho.
McCabe-Thiele (Ted):
Love the range extending petrol cans - do you have to remove the rear winkers to fill them up?
deltarider:
--- Quote from: Oddjob on February 01, 2023, 05:57:35 PM ---[...]
The only difference I can think of off the top of my head that some European countries got was a slightly different airbox, which had a snorkel fitted over the top of the airbox. To suit this snorkel the carbs were changed so it ran with smaller jets, not 100% sure but Germany and maybe Holland comes to mind.
--- End quote ---
All countries on the European continent, except France, had that air duct and #78 main jets. These carbs had the number 649A stamped in the flange. France, like the other markets, had the 627B carbs with the #100 main jets and no air duct. Many have experimented with removing the air duct and fitting the #100 jets. It brought nothing but extra intake noise. The only reason I've found, is that back then as well as now, Germany had dB tests at idle. In order to comply Honda fit the air duct and the #78 jets. Testers found no change in performance. This model performs the same as others, only with less intake noise at idle. Why that is, we dont know. It's well possible the air duct gives a better flow and less turbulence than the gaze net the other models had.
B11sey:
Great information Deltarider and Oddjob my carbs are stamped 627B .
Thanks to everyone who has given information.
So what we know so far is:
It was produced May 71 and UK reg Aug 72
It is definatly a K0 but NOT USA spec
Originally meant for the French or Uk (unlikely) markets
Tank stripes are not standard
deltarider:
Maybe page B 3 gives a clue: https://www.honda4fun.com/dwnload/Part-List/CB500/CB500-K1-K2-Parts-List.pdf
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