BSA Motorcycles 1950s

BSA PARTS SERVICE BULLETIN No

BSA PARTS SERVICE BULLETIN No. G.21 pg.1

Note. This page was awash with antique MS code and there is a chance some errors crept in during conversion. Another version here:

BSA G21 (v1)

All parts except those listed below are as shown in the Super rocket or Gold Star Parts Catalogue. Parts marked + are new components for the Rocket Gold Star and not used on other models.

Spares No. QTY Description.

ENGINE

+ 42-0202 Engine complete

+ 42-0129 " " [less lighting]

+ 19-7036 Carburettor [1 5/32" Monobloc]

15067-1552 [2]Piston [8.75:1]

13365-2541 Engine sprocket [23 T]

PARTS REQUIRED WHEN LIGHTING IS NOT FITTED

11567-0458 [2]Crankcase sealing washer [dynamo]

10724-0209 Bolt ]

40102-2138 [2]Plain washer] For fixing sealing washer

10903-0636 Nut ]

10166-6257 Split pin ]

Dynamo cork washer

11842-4480 "hole cover [N/S]

11842-4481 " " " [O/S]

10242-4482 " " " fastener

30132-6009 " " "nipple

PARTS NOT REQUIRED WHEN LIGHTING IS NOT FITTED

Dynamo

11267-1876 " strap

10929-2023 " " eyebolt

40965- 2352 " " plug

10302-0833 " " nut

40729-4662 " " washer

10367-0353 " stud

19-8631 " chain

12167-0727 " driven sprocket [11T]

10167-0729 Dynamo driven sprocket lockwasher.

Continued……/

PARTS BULLETIN NO. G.21 [ CONT'D] pg.2

SIAMESE EXHAUST SYSTEM

10642-2640 Exhaust pipe assembly [siamese]

15342-2635 " "[O/S]

13842-2644 " "[N/S]

41442-2860 " clip [N/S]

40590-3063 Pin ]

40290-3064 Swivel ] N/S loosepipe fixing

40221-5102 Nut ]

12142-2848 [2]Exhaust pipe finned collar

10521-6187[2]Screw ]

40129-0541 [2]Washer]Collar to pipe

40221-5102 [2]Nut_]

40302-0204 [2]Bolt]

40102-1462 [2]Washer]Bracket to silencer

40202-2395 [2]Nut]

41442-2860 Silencer and exhaust pipe clip

40590-3063 Pin ]

40590-3064 Swivel ] Silencer and exhaust pipe clip

40221-5102 Nut _]

10602-0803 Bolt ]

40102-0522 Washer] Silencer fixing when pillon footrests not fitted

40402-0449 Nut ]

Other parts as Super Rocket

TRACK TYPE SILENCER

15842-2627 Silencer complete

TWIN EXHAUST SYSTEM

16942-2649 Silencer complete with brackets, bolts and nuts

10602-0803 [2]Bolt]

40102-0522 [2]Washer ] Silencer fixing when pillion footrests not fitted

10302-0499 [2]Nut]

GEARBOX

Internals are the same as Gold Star Clubman's [RRT2]

14542-3037 Kick-start crank complete

Continued……/

PARTS BULLETIN NO. G.21[CONT'D ] pg3

CLUTCH

Comprising parts as P.S.B. No.G.A.10 and G.A.11

42-3264 Clutch assembly complete

42-3170 Clutch sleeve

42-3206 [20]Clutch sleeve roller

42-3266 Clutch chain wheel

42-3235 Clutch centre

42-3189 [4]Clutch spring stud

42-3267 Mainshaft nut

42-3236 " "lockwasher

42-3237 " " washer

42-3262 [5]Driving plate

42-3195 [6]Driven plate

42-3173 Pressure plate

42-3197 [4]Spring cup

42-3273 [4]Spring stud nut

65-3940 Push rod [Not included in 42-3264 assembly]

FRAME AND FITTINGS

+ 42-4688 Frame complete

PARTS REQUIRED WHEN SADDLE IS FITTED

40328-2080 Saddle front bolt grease nipple

10767-4040 [2]Stud]

40102-0923 [2]Washer] rear saddle fixing

40202-0049 [2]Nut_]

11267-4030 Bolt ]

40166-4707 Washer ]Front saddle fixing

40202-0046 Nut ]

PARTS NOT REQUIRED WHEN SADDLE IS FITTED

56742-9230Twin seat

10642-9183 [2]" support rubber

11942-9199 Rear support bracket

10742-9060 Ft. support pin

10365- 5446 " fixing grub screw

40102-0923 [6]Washer

40124-8784 [2]"

40135-0033 [3]Spring washer

40524-0563 [2]Nut

40467-8313 Earth wire bolt

40528-2338 [2]Bracket

10942-9061 [2]Rear fixing bolt

continued…../

PARTS BULLETIN NO.G21[CONT'D ] pg.4

AIR CLEANER

13468-4600 Air cleaner

10668-4606 " 'o' ring

BATTERY CARRIER [MLZ9E BATTERY]

42-4650 Battery carrier complete

13142-4561 " base plate complete

11242-4649 "carrier wire base complete

10942-8049 " "base mat

10542-6770 [4]Bolt]

40102-0923 [4]Washer] Base plate fixing

40136-0382 [2]Lockwasher]

10515-6524 [2]Nut

CENTRE STAND [FOR USE WITH SIAMESE PIPES]

14942-4762 Centre stand complete

FRONT FORK [WITH LIGHTING]

+ 19742-5146Front fork complete

16467-5057 Sliding tube complete [N/S]

16465-5420" " [O/S]

14342-5317 Outer sleeve [N/S]

14342-5321 " [O/S]

14142-5315 [2] Oil seal holder complete

12265-5451 " [South Africa and Australia only].

12542-5320 [2]Fork bellows

11342-5323 [2] " clip

15442-5015"bottom yoke

11265-4226 Damper knob securing plate

42-5011 Top yoke [ use 42-5036]

10764-6016" clip nut

Other parts as Gold Star

FRONT FORK [WHEN LIGHTING NOT FITTED]

+ 19742-5147Fork complete

14342-5318 [2]"outer sleeve

11142-5319 Damper knob securing plate

Other parts as Gold Star

Continued…../

PARTS BULLETIN NO. G.21 [CONT'D] pg.5

FRONT FORK [CLIP ON BARS-WITH LIGHTING]

+ 19742-5148Fork complete

Other parts as Gold Star

FRONT WHEEL [8" BRAKE]

18442-5513 Front wheel complete [3.25 x 19]

14742-5514 " "rim[steel 3.25 x 19]

+ 19342-5900" " complete[alloy 3.00 x 19]

+ 17042-5901" " rim[alloy 3.00 x 19]

+ 19342-5906" " complete [alloy 3.25 x 19]

+ 17042-5907" " rim[alloy 3.25 x 19]

Other parts as Gold Star

FRONT WHEEL [190 mm BRAKE]

+ 19342-5902Front wheel complete [3.00 x 19 alloy]

+ 17042-5903" " rim[3.00 x 19 alloy]

+ 19342-5904" " complete [3.25 x 19 alloy]

+ 17042-5905" " rim[3.25 x 19 alloy]

Others parts as Gold Star

REAR WHEEL

+ 18642-6378Rear wheel complete [wm2-18 alloy]

+ 17042-6379" " rim[wm2-18 alloy]

+ 18642-6376 " "complete [wm2-19 alloy]

+17042-6377" " rim[wm2-19 alloy]

Other parts as Gold Star

FRONT MUDGUARD

+ 17142-6535Front mudguard [with No. plate holes]

+ 17142-6536" " [less No. plate holes]

10468-5093 Cable grommet

13342-6547 [2]Mudguard stay [short]

13442-6548[4]" " [long]

10642-6558 No. plate beading

REAR GUARD

+17142-6911Rear mudguard

+14142-6912" "stay [O/S]

+13742-6914" " "[N/S]

+ 11842-6916" " top bracket

+ 11242-6917[2] Stiffening bracket

REAR BRAKE CONTROL [FORWARD FOOTRESTS]

14142-7003 Rear brake pedal

Other parts as Gold Star

Continued…../

PARTS BULLETIN NO. G.21 [CONT'D] pg.6

FOOTRESTS [FORWARD POSITION]

11642-4855 Footrest stud complete

13242-4854 " bracket [O/S]

12742-4857 " distance tube complete [N/S]

10224-5914 Washer ]

10142-4842 Lockwasher] rests to stud

24-7000 Nut ]

PILLON FOOTRESTS

15242-4835 Pillion footrest assembly

Note: Footrests for track type silencer

67-4871 anchor bolt in place of

29-7560 and additional distance

piece 29-7565.

PRIMARY DRIVE

19-8608 Primary chain [1/2" x .305" x 70.P]

15242-7515 Chaincase back

41440-0238 Clutch adjuster cap

40240-0239 " " "washer

11142-7546 Drain plug and oil level tube complete

10140-3089 Drain plug washer

10415-0645 Oil level bolt

40166-7518 " " washer

10542-7509 Chaincase and crankcase joint washer

11842-7518 " "flange washer

10542-7516 [2]Bolt] chaincase to crankcase

40124-8784 [2]Lockwasher_]

40764-6054 Bolt ]

40102-0923 Washer ]Chaincase back to frame

40135-0033 Lockwasher ]

40502-0049 Nut]

10342-4792 Distance collar_]

40129-0940 Distance washer [as reg.]

10542-7517 [3]Cover screw

Other parts as Gold Star

Continued…./

PARTS BULLETIN NO. G.21 [CONT'D ] pg.7

REAR CHAINGUARD

19-8623 Rear chain [5/8" x 3/8"x 99.P]

14842-7706 Rear chainguard

10402-0353 [2]Bolt]

40124- 8784 [2]Lockwasher] Front fixing

10765-0292 Bolt ]

40102-0923 Washer ] Top bracket on

10742-7703 Distance piece ]

40124-8784 Lockwasher ] Swingarm

40202-0049 Nut ]

11003-4089 Bolt ]

40102-0923 Washer ] Lower bracket on

10330-1194 Distance piece]

40124-8784 Lockwasher] Swinging arm

40202-0049 Nut ]

PETROL PIPES

+13342-8152Petrol pipe complete [4 gall.]

+13342-8158" " "[2 gall.]

+13342-8155" " "[5 gall.]

[ 2, 4 and 5 gall tanks are as Gold Star]

HANDLEBAR CONTROLS [STANDARD BAR]

+12242-8830Clutch cable complete

+11742-8833Ignition cable complete

+12142-8827Front bracket cable complete

10724-7849 Brake cable screw nut

10729-5871 Brake cable toggle end

10402-0510 Screw ]

40102-1462 Lockwasher] toggle end to lever

10202-0443 Nut ]

11767-7531 Throttle cable complete

+11742-8836Air cable complete

84040-8538 Front brake control less cable

84242-8781 Clutch and ignition less cable

continued……../

PARTS BULLETIN NO. G.21 [CONT'D ]pg.8

HANDLEBAR CONTROLS [WETERN BAR]

+11767-8530Throttle cable complete

+11742-8837Air cable complete

+12142-8838Brake cable complete

+ 42-8841 Clutch cable complete

Other parts as 'A' Group or Gold Star

HANDLEBAR CONTROLS [2 PIECE]

+ 42-8836 Air cable complete

13242-8665 Clutch lever

29-8813 Clutch lever screw [use 10202-1500]

40329-8814 Clutch lever screw nut

11642-8687 Clutch cable nipple adaptor

10590-0029 Clutch cable adjuster spring

13642-8685 Front brake lever

29-8813 Front brake lever screw [use 10202-1500]

40329-8814 Front brake lever screw nut

11642-8687 Cable nipple adaptor

10590-0029 Control adjuster spring

12142-8660 Front brake cable complete

10729-5871 Front brake cable toggle end

10202-0510 Screw

40102-1462 Lockwasher toggle end to lever

10202-0443 Nut

+11742-8833Ignition cable complete

Other parts as Gold Star

TOOL BOX

15042-9262 Toolbox complete

40302-2273 Bolt

40224-0978 Lockwasher bracket to box

40202-2395 Nut

40215-0331 [2]Washer] voltage control

40102-0923 [2]Washer]

40124-8784 [2]Lockwasher]to box

10642-9009 Grommet [control cable]

40124-8784 [2]lockwasher]

40202-0049 [2]Nut] Front fixing

10942-9256 Bolt

40124-8784 Lockwasher Top fixing

10742-8339 Spacer

10227-5676 Washer

40202-0049 Nut

Continued……/

PARTS BULLETIN NO.G21 [CONT'D ]pg.9

SPEEDOMETER AND REV. COUNTER

+ 11642-9292[2] Mounting brackets

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