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Author Topic: Gearbox shifter drum  (Read 4905 times)

Offline Pauarc

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Gearbox shifter drum
« 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
« Last Edit: January 10, 2024, 10:52:06 AM by Pauarc »
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Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2

Offline Johnny4428

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Re: Gearbox shifter drum
« Reply #1 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.
« Last Edit: January 10, 2024, 02:04:54 PM by Johnny4428 »
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1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1
1978 Honda CB550K3
1999 ST1100 Pan European 50th Anniversary.
1975,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline Nurse Julie

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Re: Gearbox shifter drum
« Reply #2 on: January 10, 2024, 02:38:18 PM »
Agree, later type.
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Offline Bryanj

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Re: Gearbox shifter drum
« Reply #3 on: January 10, 2024, 02:39:12 PM »
I thought there was a bulletin on that in alladins cave which had pics on it
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Offline Bryanj

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Re: Gearbox shifter drum
« Reply #4 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
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Offline Johnny4428

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Re: Gearbox shifter drum
« Reply #5 on: January 10, 2024, 03:25:26 PM »
Thanks Bryan, I knew I had read somewhere but couldn’t remember where.
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1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1
1978 Honda CB550K3
1999 ST1100 Pan European 50th Anniversary.
1975,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline Bryanj

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Re: Gearbox shifter drum
« Reply #6 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
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Offline Pauarc

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Re: Gearbox shifter drum
« Reply #7 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)
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Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2
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