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Key to thread descriptions:
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NSC: Non Standard Cycle
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Cycle: British Standard Cycle Thread
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BSF: British Standard Fine
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BSW: British Standard Whitworth
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BSP: British Standard Pipe Thread
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UNF: Unified Thread
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Engine
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Cylinder head bolts 3/8 BSF
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Cylinder head timing access bolt 1/4 cycle (1/4 BSF alt.)
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Cylinder base studs 7/16 whitworth to
c.case, 7/16x20 NSC to nut (7/16UNF alt.)
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Tappet cover
1/4 whitworth
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Valve lifter fitting to cylinder 3/4x20 NSC
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Valve lifter spindle nut 1/4 cycle (1/4 BSF alt.)
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Cam follower guide to c.case 3/4x20 NSC
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Tappet adjusters 5/16 cycle
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Timing side outriger plate bolts 5/16 whitworth to c.case 5/16 cycle to cam spindles and int. Gear spindle
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Timing cover screws 1/4 whitworth
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Magneto access plug 1 25/32x19 non standard thread
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Timing cover oil pressure relief fitting 3/8 BSF
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Timing side c.shaft mainshaft 1/2 NSC (1/2UNF alt)
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Drive side c.shaft mainshaft 3/4x20 NSC
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Oilpump drive spindle retaining peg 1/4 cycle (alt 1/4BSF)
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Oilpump retaining bolts 1/4 whitworth
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Oilpump assembly bolts 3/16 BSF
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Sump plate studs 1/4 whitworth to c.cases 1/4 cycle (alt 1/4 BSF to nuts)
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Primary chaincases to c.case bolts 5/16 whitworth
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C.case oil pipe union fittings 3/8 BSF to c.case 1/4 BSP to oil pipe nuts
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C.case breather to c.case 5/8x20 NSC
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C.case breather to vent pipe nut 7/16x20 NSC (7/16 UNF alt.)
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C.case breather fitting to breather body 5/8x20NSC
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C.case joining studs 5/16 whitworth to c.case 5/16 cycle to nut
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C.case joining nuts and bolts 5/16 cycle
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Carb mounting studs 5/16 cycle both ends
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Magneto strap bolt and trunnion 5/16 cycle
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Gearbox
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Gearbox drain plug 7/16x20 NSC ( 7/16 UNF
alt.)
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Gearbox Filler plug 7/8 BSP
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Gearbox inspection cover plate 3/16 Whitworth
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Kickstart return spring securing screw 1/4 cycle (1/4 BSF alt.)
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Inner cover
securing screws and bolts 1/4 Whitworth
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Gearbox outer cover screws 1/4 Whitworth
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Gearbox
outer cover bolts (from rear of inner cover) 1/4 Whitworth (if studs
are fitted 1/4 Whitworth to outer case and 1/4 cycle to nut)
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Clutch pushrod adjustment screw 1/4 cycle (1/4 BSF alt.)
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Gearbox mainshaft
(kickstart ratchet end) 9/16x20 NSC
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Gearbox mainshaft (clutch end) 5/8x20 NSC
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Gear change control shaft 7/16x20 NSC (7/16 UNF alt.)
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Operating plate and pawl arm stop screws 5/16 cycle
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Pawl pivot nuts 1/4 cycle (1/4 BSF alt.)
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Gear control link adjuster 5/16 cycle
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Gear control quadrant shaft 3/8 cycle
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Gearbox
sprocket nut and sleeve gear 1 1/4x24 NSC
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Primary
Drive
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Inner
primary chaincase to chainguard stud
1/4 cycle (1/4 BSF
alt.)
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Inner
primary chaincase drain plug 1/4
cycle (1/4 BSF alt.)
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Inner
primary chaincase sliding plate retaining bolts and nuts 1/4 cycle (1/4
BSF alt.)
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Outer
primary chaincase inspection plug 1 25/32x19 Non standard thread
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Outer
primary chaincase oil level plug 3/8 cycle
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Outer
primary chaincase fixing screws 3/16 cycle
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Clutch
sleeve extractor thread 1”x24 cycle
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Clutch
sleeve and clutch spring nut 1 3/16x24 cycle
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Clutch
mainshaft nut extractor tool thread 5/16 cycle
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Clutch
pressure plate ball bearing fitting 1/2x20 NSC (1/2 UNF alt.)
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Clutch
cover fixing screws 2BA
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