. I've done just 200 miles on my laydown,1951 gearbox; my first gearbox rebuild. It shifts nicely: finds first and neutral easily and always downshifts as it should. But...now and again, when I select 3rd I get nothing. Feel no resistance on the shift lever. Let out the clutch and I'm still in second. Try again and same thing. Shifts into 3rd easily if I shift without the clutch. Then when continuing up to 4th I feel resistance on the shift lever but after letting out clutch still not quite in 4th. But if I keep slight pressure on the shift-lever it clicks into 4th. Then minutes later, down-shift to first and it shifts back up through the gears to 4th perfectly. Go figure ?!?
I'm half way through the break-in on my new piston and don't want to pull the gearbox, but I'm going to have to sort this out sooner or later. I am hoping that I've incorrectly assembled the gear select ratchet plate parts...perhaps one notch off on the pawl or a spacer in the wrong place? Compared to the internals this is easily accessible with the gearbox in the bike.
I hope there is somebody out there who can tell me if I'm on the right track and can provide any additional advice?
I would be very grateful. Grant MacNeill, the Twelfth Fret Guitar Shop, Toronto....sales@12fret.com
I would suggest..
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.. that the pawl spring is weak / binding or the pawl components are binding. As you say, easy to get at. You can operate the parts with the end cover off and see what's going on.