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Messages - Jim S

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Singles / Re: 1949 b31 gear lever
« on: 06 February, 2020, 19:06:44 »
I have a 1949 B33. I just measured the gear change lever. About 5 1/8  inches.


Singles / Re: Gearbox issue B31
« on: 07 January, 2020, 15:59:04 »
If you are extra special lucky, it could be you only need to adjust the length of the link rod between the selector quadrant and the gearchange mechanism.
However, I had a similar issue getting into 3rd gear on my b33. The 3rd/4th gear shifter fork and the associated sliding dogged wheel were worn causing the dogged wheel not to fully engage into the gear when shifting.  I replaced the dogged wheel but I had to have the shifter fork faces welded then machined because I couldn't find a new replacement. Shifting is now very good.

Regarding the speedometer reading, I also have this problem because the rear wheel sprocket is larger than spec. Count the teeth on your rear sprocket and gearbox sprocket to see if they agree with the manual sizes.

Singles / Re: M33 kickstart problem
« on: 07 January, 2020, 15:30:57 »
Sounds like you found your problem.
Sorry I lead you down the path to remove the primary cover although if you want to be extra sure, you could remove the primary chain, then spin the gearbox main shaft by hand to ensure there is no resistance.
One note, you say you degreased the pinion and ratchet. I'm not sure there should be grease in this area.

Singles / Re: M33 kickstart problem
« on: 28 December, 2019, 12:43:17 »
Hi Rog1
Let us know what you find.

Singles / Re: M33 kickstart problem
« on: 23 December, 2019, 03:13:29 »
I would pull off the primary cover and see if the outer clutch plate or clutch basket has a wobble when you kick it over with the clutch lever pulled in.
Another possibility is a gear box main shaft bearing problem.

Twins / Re: a10 plunger clutch play
« on: 29 July, 2019, 23:46:40 »
Is it a 6 spring clutch?

Singles / Re: Bsa b31 Valve and Guide
« on: 29 January, 2019, 20:41:14 »
I have a similar problem with my 1949 B33 and I think I found the root cause. I have found that the seat for the exhaust valve spring is blocking the drain hole.
To address this I have reamed a champher on the hole and I will install a thin 0.75in. washer under the seat. This will allow oil to flow over and under the seat for better access to the drain

Singles / 1949 B33 Gearbox Shifter Fork Repair
« on: 16 January, 2019, 01:01:14 »
Hi, I am a new forum member. I had a problem getting into 3rd gear on my 1949 B33. I found the 3rd/4th gear shifter dogged gear and shifter fork badly worn. I found a replacement dogged gear but could not find a shifter fork. I had the old fork weld repaired.

The repair is to the faces of the fork that fit in the slot of the dogged gear. The faces were built up with a mig welder and machined to the same width as the 1st/2nd gear fork.

Does anyone have any experience with this type of repair? Are the original parts face hardened?

Also, when I installed the gears back in the housing, the shifter fork shaft moves axially about 0.015 inches as I select various gears. There were no spacers on this shaft when I removed it. Does anyone have comments on this axial movement?

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