Gearbox

For gaskets click here; for tie bolts and adjusters click here; for clutch, and clutch operating parts click here; for clutch cables and adjusters click here.

Although the gearbox was made by Burman, the mainshaft was designed to mount the existing BSA ‘C’ group clutch. The gearbox model number was GB30 until 1955 engine number LA1265 when it changed to GB33 to denote the introduction of a few changes. The only significant one was to the method of clutch adjustment, which was now carried out at the kick starter end of the push rod instead of at the clutch pressure plate.

.

Part No

Description

Per

Years

3307-35

Kickstarter rubber 1 1954-58

3792-52

Clutch cable adjuster 1 1954-58

3793-52

Clutch cable adjuster lock nut 1 1954-58

12401-54

Shell 1 1954-58

12402-54

Kickstart case 1 1954-58

12404-54

Outer cover 1 1954-58

12408-54

1st gear, mainshaft 1 1954-58

12410-54

2nd gear, mainshaft 1 1954-58

12411-54

3rd gear, mainshaft 1 1954-58

12413-54

Output or sleeve gear 1 1954-58

12414-54

Output or sleeve gear, bush 2 1954-58

12415-54

1st gear, layshaft 1 1954-58

12416-54

1st gear, layshaft, bush 1 1954-58

12417-54

2nd gear, layshaft 1 1954-58

12418-54

2nd gear, layshaft, bush 1 1954-58

12419-54

3rd gear, layshaft 1 1954-58

12420-54

Output gear, layshaft 1 1954-58

12421-54

Mainshaft 1 1954-58

12422-54

Mainshaft bearing, kick start end 1 1954-58

12426-54

Mainshaft bearing, clutch end 1 1954-58

12428-54

Mainshaft bearing, circlip, clutch end 1 1954-58

12429-54

Output or sleeve gear, oil seal 1 1954-58

12430-54

Sprocket nut 1 1954-58

12431-54

Sprocket, 17T 1 1954-58

12432-54

Spacing collar, sprocket 1 1954-58

12433-54

Layshaft 1 1954-58

12434-54

Layshaft bush, kick start end 1 1954-58

12435-54

Layshaft bush, clutch end 1 1954-58

12437-54

Layshaft cover washer 1 1954-58

12440-54

Drain plug 1 1954-58

12444-54

Case screw 5 1954-58

12447-55

Clutch operating assembly 1 1955-58

12450-54

Clutch operating nut 1 1954

12450-55

Clutch operating nut 1 1955-58

12454-55

Washer, clutch screw worm 1 1955-58

12455-54

Oil level plug 1 1954-58

12456-55

Clutch adjusting screw 1 1955-58

12459-54

Cam centre pin 1 1954-58

12460-54

Cam centre pin lockwasher 1 1954-58

12462-54

Positive stop pawl 1 1954-58

12463-54

Positive stop pawl spring 1 1954-58

12464-54

Positive stop pawl spring plug 1 1954-58

12465-54

Positive stop pawl pin 1 1954-58

12468-54

Gearchange spindle 1 1954-58

12471-54

Gear lever bolt 1 1954-58

12476-54

Gearchange spindle oil seal washer 1 1954-58

12480-54

Gearchange quadrant 1 1954-58

12482-54

Gearchange return spring 1 1954-58

12483-54

Gearchange quadrant secondary return spring 1 1954-58

12485-54

Selector fork, mainshaft 1 1954-58

12486-54

Selector fork, layshaft 1 1954-58

12490-54

Gear lever rubber 1 1954-58

12492-54

Kickstarter spindle bush, inner 1 1954-58

12493-54

Kickstarter spindle oil seal 1 1954-58

12494-54

Kickstarter spindle oil seal washer 1 1954-58

12495-54

Kickstarter spring 1 1954-58

12496-54

Kickstarter spring pin 1 1954-58

12497-54

Kickstarter ratchet pawl 1 1954-58

12500-54

Kickstarter spindle bush, outer 1 1954-58

12502-54

Kickstarter pinch bolt 1 1954-58

12503-54

Kickstarter arm 1 1954-58
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