SOHC.co.uk Forums > CB750
5th gear problem???
Johnny4428:
Stripped the countershaft this morning all seems to be fine with all gears orientated correctly and circlips fitted correctly. Incidentally there is very little difference either side of the final gear. The diagram suggests that it is flush on one side, this is not the case of course, probably just to illustrate that there is a difference. I make it about 0.1mm of a difference between the sides.
MrDavo:
--- Quote ---Went to look at a Kawasaki Z1000 (from memory) that a friend's friend had difficulty with as it would only select first gear.
--- End quote ---
Zed forums are full of people, over the years, who can only get first after a rebuild, as you say its a safety feature, to only let you get first or neutral when stationary. Why that makes it safer, I don't know. Some pull the engine apart again, only to get the same result of course. I can't say I'm a fan, I wanted to check my Z1A gearbox worked OK before I put the engine in, not wait until I was on the road again.
When I rebuilt my CB750 K1, I remember being paranoid about whether top gear was in the right way round, and deeply regretting not keeping the cluster together, as I was damned if I could tell which way round it went, although I knew it mattered. I must have guessed right as it worked fine, but I did worry.
K2-K6:
--- Quote from: MrDavo on May 09, 2022, 03:30:06 PM ---
--- Quote ---Went to look at a Kawasaki Z1000 (from memory) that a friend's friend had difficulty with as it would only select first gear.
--- End quote ---
Zed forums are full of people, over the years, who can only get first after a rebuild, as you say its a safety feature, to only let you get first or neutral when stationary. Why that makes it safer, I don't know. Some pull the engine apart again, only to get the same result of course. I can't say I'm a fan, I wanted to check my Z1A gearbox worked OK before I put the engine in, not wait until I was on the road again.
When I rebuilt my CB750 K1, I remember being paranoid about whether top gear was in the right way round, and deeply regretting not keeping the cluster together, as I was damned if I could tell which way round it went, although I knew it mattered. I must have guessed right as it worked fine, but I did worry.
--- End quote ---
You can usually spin bike gearboxes with the first/mainshaft before putting the clutch on so that you can check the gearbox all works without any reservations before committing to final installation. Old trick on things like Triumph Dolomite sprint and Rover V8 engine when you could remove the distributor and using ad-hoc quill shaft in electric drill to spin the oil pump and bring oil pressure up prior to running springs to mind.
You may be able to spin the Kawasaki input shaft fast enough by hand to check changing upward, or make a drill adapter to spin that shaft and facilitate it that way.
K2-K6:
Johnny4428, was that circlip installed like that with the tang sticking out ?
Johnny4428:
--- Quote from: K2-K6 on May 10, 2022, 06:36:09 AM ---Johnny4428, was that circlip installed like that with the tang sticking out ?
--- End quote ---
I’m guessing Nigel that this circlip was a victim when the bike threw the chain and it came through the crankcase. You can see an impact mark on the side of it.
Also centre shifter fork a candidate for replacement.
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