Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: Popstar on November 29, 2021, 05:03:53 PM

Title: Headstock number
Post by: Popstar on November 29, 2021, 05:03:53 PM: The plate on the headstock of my bike has 6/71 on it does that make it a KO or K1 ?
Title: Re: Headstock number
Post by: Bryanj on November 29, 2021, 06:03:27 PM: Yes it does

But seriously many other things make the difference,
Put up pics of both sides and i will tell you
Title: Re: Headstock number
Post by: Seabeowner on November 29, 2021, 06:32:50 PM: Mine is about 7/71 and about 6600 higher number. They certainly were churning them out.
I think just about all at that time went to the USA and maybe Japan and will be K0.
Title: Re: Headstock number
Post by: Popstar on November 29, 2021, 07:06:23 PM: Thanks,this one is a US import,and yes thatâ€™s some difference in production numbers, itâ€™s no wonder they conquered the world.i wonder what month production started.
Title: Re: Headstock number
Post by: Bryanj on November 29, 2021, 08:58:50 PM: I can answer that it was Feb 1971 as i own frame number 36
Title: Re: Headstock number
Post by: Bryanj on November 30, 2021, 09:07:39 AM: Frame number brgins with a 1 so its a K0, according to theAmerican Honda ID book
Title: Re: Headstock number
Post by: Popstar on December 01, 2021, 06:49:25 PM: Thank you.
Title: Re: Headstock number
Post by: AshimotoK0 on March 09, 2022, 05:14:16 PM: Quote from: Seabeowner on November 29, 2021, 06:32:50 PM
Mine is about 7/71 and about 6600 higher number. They certainly were churning them out.
I think just about all at that time went to the USA and maybe Japan and will be K0.

Production wasn't without headaches though as Honda used quite a few components in the transmission from the CB250/350K twin and without adequate oil feed to some components plus gear shifting issues ...so, before mods were done, they had serious problems .... so serious that when they were selling unsold K0s alongside the 1st K1's there was a Class Action lawsuit in the States against Honda and certain owners could claim the agreed settlement fee, I believe.

I think CB500-1018727 was the last K0 that didn't have the mods incorporated in production. (see attached Bulletin kindly provided by Bryan on here.
Title: Re: Headstock number
Post by: Bryanj on March 09, 2022, 08:19:00 PM: That mod gave better neutral detent, better shift drum location and, in theory, less clutch slip and also had a little oil feed scoop in it.