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Cb750 DOHC popping out of gear.

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Blocke
L Plate Warrior



Joined: 01 Aug 2020
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PostPosted: 23:57 - 01 Aug 2020    Post subject: Cb750 DOHC popping out of gear. Reply with quote

I was riding the other day when my 79 CB 750 popped out of gear. No warning whatsoever. Now it won’t stay in any gear. I remove the clutch and it looks almost brand new. Looking at the shifter linkage it will shift through all gears although it is hard to get into first and won’t go into fifth. Any help would be appreciated greatly
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steve the grease
Scooby Slapper



Joined: 26 Jan 2018
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PostPosted: 00:39 - 02 Aug 2020    Post subject: Reply with quote

Sounds like it could be a bent gear selector , but how?
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All the above is my personal opinion, you can see my lips move, but I'm talking out of my arse.
I've been riding, and fixing , bikes for 50 years, in that time the more I learn, the less I am absolutely sure of.....
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Pete.
Super Spammer



Joined: 22 Aug 2006
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PostPosted: 05:45 - 02 Aug 2020    Post subject: Reply with quote

I agree with Steve, bent something in the box. Nothing for it but to remove the engine and split it open. Since you have the clutch apart anyway you might check the end of the selector drum just in case its only the pawl wheel (aka star wheel) that's come loose.

Full set of internals here EXCEPT the drum and selector arm

https://www.ebay.co.uk/itm/Honda-CB750-CB-750-DOHC-1979-1982-Gear-Box-Selector-Forks-Selector-Drums/332581973215
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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doggone
World Chat Champion



Joined: 20 May 2004
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PostPosted: 08:26 - 02 Aug 2020    Post subject: Reply with quote

Worn selectors are a common problem with most ageing gearboxes - in all vehicles.
If it seems to have come on very suddenly that could indicate something else more serious has happened though. A bearing starting to go maybe.
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