SOHC.co.uk Forums > CB350/400
Gearbox Stuck - The last straw?
SeanFD:
--- Quote from: Athame57 on July 15, 2025, 09:31:33 AM ---
--- Quote from: SeanFD on July 15, 2025, 08:14:36 AM ---
I started off down the road, slowed and changed down for a junction, and then couldn't engage 2nd gear. And that's how I rode, thankfully not far, home.
So now I can only move between 1st gear and neutral. The clutch engages and disengages with the bike in 1st. But no second gear.
--- End quote ---
I had this issue for a few days and discovered all I had to do was reposition and tighten the gear change lever. ::)
--- End quote ---
Checking the clutch is actually No 2 on my list. The pedal is No 1; it is too low now - it was hard to get my foot under it to change up before the problem started - so I'll adjust the position and see.
K2-K6:
Ordinarily the clutch .... shouldn't .... affect the gear change mech on bike engines, that's without a very obscure coincidence.
They are, in essence, a pretty crude device. The selection should work regardless of any clutch adjustment.
With it on msinstand, rotate rear wheel back and forth while trying to select and go through ratios. If it's refusing that, then probably next inspection is selector mechanism which I recall is behind the clutch on these ?
It may be something very simple displaced or snagging.
taysidedragon:
My 400f doesn't like changing gear or finding neutral when the clutch adjustment is out of spec.
I suggest slackening off both ends of the clutch cable and remove the triangular cover on the clutch cover. Adjust the screw and locknut on the clutch release first, then the cable at that end. Lastly adjust the free play at the lever end.
When you check the gear lever make sure that the dot markings are in the right position on lever and shaft. They can be really hard to see on old parts. Also lubricate the rose joints. Any stiffness affects the gear lever action. 😉
florence:
I agree with going through the gears, without engine running, by turning rear wheel and operating the gear lever by hand. If this doesn't work then the selector will be at fault. My 350, which is a similar design, decided to stay in top gear on a run once. I had to ride all the way home in fifth. Once at home, when I took the clutch cover off, I found that a bolt in the selector had come loose and the selector fork couldn't engage properly. I would start there and see how you get on.
Bryanj:
Most common problem with bad 400 gearchange is the operating lever on wrong spline of gearchange shaft and physically hitting something
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