Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: Pauarc on January 10, 2024, 10:45:34 AM

Title: Gearbox shifter drum
Post by: Pauarc on January 10, 2024, 10:45:34 AM

Does anyone know how to check if this shifter drum is the early one or later one as I can’t find any identification number on it it’s from a k2 engine

Title: Re: Gearbox shifter drum
Post by: Johnny4428 on January 10, 2024, 01:59:56 PM

That looks to me like the later modified drum. The reason I say that is that the modified ones had a wider point where the gears were in the midst of changing. That is explained very poorly but I have a photo of the one that came out of my K3. Modified to give smoother change between gears as far as I’m aware.

Title: Re: Gearbox shifter drum
Post by: Nurse Julie on January 10, 2024, 02:38:18 PM

Agree, later type.

Title: Re: Gearbox shifter drum
Post by: Bryanj on January 10, 2024, 02:39:12 PM

I thought there was a bulletin on that in alladins cave which had pics on it

Title: Re: Gearbox shifter drum
Post by: Bryanj on January 10, 2024, 02:47:01 PM

Sevice bulletin 750*40 in the dropbox, i knew it exixted as i still have the paper copy, hopefully a screenshot attached

Title: Re: Gearbox shifter drum
Post by: Johnny4428 on January 10, 2024, 03:25:26 PM

Thanks Bryan, I knew I had read somewhere but couldn’t remember where.

Title: Re: Gearbox shifter drum
Post by: Bryanj on January 10, 2024, 05:16:33 PM

No problem mate, i managed to collect most of the technical and service bulletins years ago which Ash scanned and put in either his dropbox or alladins cave, same as my very early parts books

Title: Re: Gearbox shifter drum
Post by: Pauarc on January 11, 2024, 01:21:28 PM

Thanks for the help I had seen the Honda update (but couldn’t figure out how to measure it)