Mainly BSA
Mainly BSA
Military Bikes Info

BSA WM20 Used Engine Spares

This is a special page, solely listing spares for BSA WM20 Engine parts.

Parts are genuine unless stated reproduction.

Spares for other WW2 Military motorcycles can be found here.

N.O.S TAPPET GUIDES 66-1494.

AS NEW GOOD FOR INLET OR EXHAUST.

£ 15 each.Item: 51635

N.O.S INLET VALVE TAPPET-66-1493.

AS NEW - LAST 3 .

£20 each.Item: 51633

N.O.S INLET OR EXHAUST VALVE GUIDE.

LAST ONE .

£ 20Item: 51631

BARREL AND PISTON – + 20. GOOD THICK FINS .

SMALL AREA OF FIN DAMAGE NEAR EXHAUST STUB -SEE PICTURES .

£200Item: 51615

COMPLETE FLYWHEEL & ROD ASSEMBLIES .- GET A SPARE ONE WHILE YOU CAN !- 6 LEFT!

ALL GOOD BUT WILL NEED REBUILDS IF GOING TO USE FOR USEAGE AND NOT DISPLAY !

£25. Item: 51443

A 1944 ENGINE WITH POTENTIAL AS HAD LIMITED USE AND STORAGE DAMP PROBLEM IS FIXABLE .

A GOOD ENGINE , IT CAME WITH MY OWN BIKE THAT WE RESTORED AND THAT IS THE BEST ENGINE THAT WE HAVE HAD .

£900Item: 51265

ENGINE COMPLETE – 1941- DESCRIPTION IN PICTURES .

A COMPLETE ENGINE THAT CAME IN A BIKE WITH MATCHING NUMBERS !

£750Item: 51128

WW2 TIMING COVER. 66-1918.

A GOOD USED COVER WHICH HAS GOOD QUILL & NON RETURN OF OIL PARTS .

£70Item: 50967

WW2 TIMING COVER WITH QUILL.

A GOOD USED COVER - BARE .

£60Item: 50813

N.O.S VALVE CHEST SPRING COVER.-66-244.

2 ONLY - THE FLAT PLATE TYPE FITTED FROM 41- 45.

£25 each.Item: 50640

N.O.S EXHAUST TAPPET HEADS -66- 1498.

SUPERB CONDITION AND OFTEN DAMAGED DUE YO INCORRECT USE OF VALVE LIFTER .

£20 each.Item: 50638

N.O.S CRANKCASE BEARING SPRING RING -65-2240.

SOME RUST BUT THEY CLEAN UP AND STILL GOOD SPRING.

£3Item: 50636

N.O.S -OIL FLINGER PLATES – 66-2250.

STORAGE MARKS ONLY.

£10 each.Item: 50634

SET OF 10 HEAD BOLTS

ANOTHER USED SET , HEADS ARE PITTED BUT WILL CLEAN UP .

£25Item: 50317

SET OF 10 HEADBOLTS .

A USED SET SO SOME RUST ON THEM .

£30Item: 50315

OIL PUMP – TURNS FREELY – NO CRACKS IN MEZAK BODY.

YOU CAN TURN WITH FINGERS , SOME LIKE THEM EASY SOME LIKE THEN STIFF !!

£100 HELD henrikItem: 50027

EXHAUST LIFTER LEVER- 66-1431.

A GOOD USED LEVER .

£35Item: 49900

CRANK CASE AIR RELEASE UNIT -COMPLETE,

A WORKING UNIT WITH THE FLAP WORKING AND NOT STUCK.

£35Item: 49896

PAIR OF TAPPET HEADS .

IN GOOD USEABLE CONDITION.

£ 30Item: 49559

VALVE SPRING COLLARS -PAIR.

USED AND RE USEABLE PARTS .

£20Item: 48678

OIL PUMP SPINDLE RETAINING PIN. 65-2580.

A GOOD USED PART.

£15Item: 48674

ENGINE SHAFT TIMING PINION 65-692.

A GOOD USED PART A1 CONDITION.

£50Item: 48672

CRANKCASE MAGNETO SHIMS .005 THOU BRASS – 66- 2347.

THESE ARE N.O.S BUT HAVE TARNISHED ., if you have whining then youy need to shim the mag base .

£ 4 each .Item: 48099

PAIR OF CAM PINIONS WITH BUSHES – BEST CONDITION .

A GOOD USED PAIR OF CAMS .

£45Item: 47957

USED & USEABLE CONDITION.

£15Item: 47955

CRANK CASE SCAVENGE FILTER -BRASS .

USED & RE USEABLE, CLEAN AND FIT .

£15Item: 47953

OIL PUMP DRIVE SPINDLES .

USED - BEST CONDITION .

£65Item: 47951

MAGDYNO IDLER DRIVE PINION WITH BUSH- 66-2250.

A USEABLE PINION.

£12Item: 47814

PAIR OF CAM PINIONS WITH BUSHES.

A USED INLET & EXHAUST SET OF CAMS .

£30Item: 47812

CRANK CASE AIR RELEASE UNIT .

A WORKING UNIT WITH THE FLAP WORKING AND NOT STUCK.

£40Item: 47810

OIL PUMP DRIVE SPINDLE – 66-6260.

A USABLE USED DRIVE.

£45Item: 47806

TIMING CHEST PLATE WITH BEARING.

A GOOD USED & REUSEABLE PART.

£18Item: 47723

ALMOST NEW -PAIR OF ALPHA VALVES .

A GOOD STRAIGHT STEM , GOOD TO USE.

£50Item: 47721

OIL FLINGER PLATE – 66-2250.

USED & NEED A GOOD CLEAN TO RE-USE .

£5Item: 47719

MAGDYNO HOLDING STRAP WITH BOLT .

USED & USEABLE CONDITION.

£18Item: 47717

EXHAUST TAPPET HEAD .

USED & RE USEABLE, CLEAN AND FIT .

£10Item: 47713

CRANKCASE SCAVENGE PLATE WITH BRASS FILTER .

USED , NEEDS A GOOD CLEAN UP, UNTOUCHED .

£25Item: 47711

OIL PUMP BRASS FILTERS 66-2623.

GENUINE NOT REPRO.GOOD CONDITION.

£15 each.Item: 47357

PISTON +20 WITH N.O.S RINGS -HEPOLITE .

A QUALITY PISTON THAT I THINK WAS N.O.S BUT DAMP STORED HENCE MARKS .

£75Item: 46656

TIMING CHEST PLATRE WITH BEARING – 65-2008.

A GOOD PLATE THATS HAD OIL REMOVED HENCE LIGHT RUST .

£15Item: 45896

CRANKCASE SCAVENGE PLATE – 66-2611.

A GOOD USED PAIR .

£30Item: 45894

CRANK SHAFT DISTANCE COLLAR – 66-660.

USED & RE USEABLE . NEED A GOOD CLEAN.

£15Item: 45892

TIMING CHEST PLATE WITH BEARING -65-2008.

A GOOD CONDITION USED PART .

£18Item: 45890

BARREL AND PISTON – REBORED TO FIT THE USED +60 PISTON .

THIS BARREL WAS GOT READY FOR A FUTURE REBUILD SO ALMOST EXTERNALLY PERFECT . REPAIR AND REBORE £100+

£ 200Item: 45754

COMPLETE EXHAUST LIFTER ASSEMBLY .

GOOD CONDITION READY TO FIT .

£75Item: 45001

EXHAUST TAPPET HEAD. 66-1498.

GOOD CONDITION -HAS SEEN LITTLE USE .

£25Item: 44999

ENGINE CRANKCASE BOLTS X 3.

GENUINE 3 BOLTS FROM BSA .

£12Item: 44997

COMPLETE EXHAUST LIFTER ASSEMBLY.

CORRECT ARM , SOME WEAR ON SPINDLE THROUGH USEAGE .

£65Item: 44995

STANDARD PISTON WITH RINGS , PIN & CIRCLIPS .

A USED PISTON THATS USEABLE .

£50Item: 44842

OIL PUMP RETAINING PIN. 65-2580.

USED & RE USEABLE .

£15Item: 44786

CYLINDER BASE & CRANK CASE STUD NUTS -5. 15-152.

A SET OF USED NUTS .

£20Item: 44280

WW2 BOTTOM END WITH CRANKSHAFT, CON ROD & TIMING SIDE PARTS .

MATCHING CASES , WAS RUNNING , WORKSHOP PLATE ON SIDE .

£475Item: 44202

WW2 TIMING SIDE ENGINE CASE .

NO MAJOR DAMAGES.

£55Item: 44200

OIL PUMP SPINDLE RETAINING PIN. 65-2580.

A GOOD USED PIN.

£15Item: 44142

WM20 STAMPED CRANKCASES – A PROPER PAIR – POST WAR DATED 1955.

WOULD HAVE BEEN USED BY A WORKSHOP AS REPLACEMENT ENGINE .A GOOD PAIR

£150Item: 44127

MAGDYNO IDLER PINION -66-2250.

USED & RE USEABLE, CLEAN AND FIT .

£15Item: 44088

OIL PUMP FILTER – BRASS – 66-2623

USED IN GOOD CONDITION .

£15Item: 44084

EXHAUST TAPPET SET -COMPLETE WITH GUIDE.

A GOOD TAPPET HEAD .

£40Item: 43784

N.O.S EXHAUST LEVER SPRING.-65-403.

AS NEW .

£10 each.Item: 42779

N.O.S EXHAUST LIFTER BUSH. 66- 1434.

STILL IN PRESERVATIVE .

£20Item: 42777

BSA CRANKPIN NUT LOCKING WASHERS WITH SCREWS – 31-300.

GENUINE USED SET.

£20Item: 42659

HEPOLITE BIG END ASSEMBLY . 1 ONLY.

BRAND NEW & COMPLETE.

£120Item: 42657

MAGDYNO DRIVE IDLER PINION WITH BUSH – 66-2250

A GOOD USED PART.

£15Item: 42496

CRANKCASE SCAVANGE COVER . 66-2611

A GOOD UNDAMAGED COVER.

£20Item: 42490

N.O.S EXHAUST VALVE LIFTER BUSH.

STILL IN PROTECTIVE GREASE .

£20Item: 42456

BSA M21 HEAD BOLTS.-8.

LONGER THAN M20.

£20Item: 41005

SET OF GENUINE CRANK CASE / PRIMARY COVER BOLTS .

WITH WASHERS .

£12.Item: 41003

CRANKCASE OIL PIPE ADAPTORS.

PAIR OF USED ENGINE ADAPTORS.GOOD CONDITION.

£20 PAIR.Item: 40795

PAIR OF VALVE SPRING COLLARS – 66-221.

A GOOD CONDITION ORIGINAL PAIR.

£20Item: 40674

SHORT MAGDYNO STRAP.

BARE STRAP.

£10Item: 40672

MAGDYNO IDLER PINION-66-2250

A GOOD USED PART .

£20Item: 40658

EXHAUST LIFTER SPINDLE – 66-1435.

USED & RE USEABLE.SPLINES LOOK GOOD .

£30Item: 38076

N.O.S CAMS -65-2420- pair.

CLEANED AND IN BEAUTIFUL CONDITION .

£85 pair.Item: 37925

MAG/DYNO IDLER PINION.-66-2250

GOOD TO USE .

£18Item: 37097

INLET VALVE 66-235

USEABLE USED VALVE .

£18Item: 36878

N.O.S EXHAUST TAPPET. 66-1498.

STILL GOT PRESERVATIVE ON IT . OFTEN BROKEN.

£35 Item: 35503

OIL PUMP FIXING BOLTS , 65-2604

GOOD USEABLE ORIGINAL CONDITION .

£20 pr.Item: 25443

Disclaimer

All genuine parts are over 70 years old. The description and images provided in no way guarantee the safety of any engines, gearboxes, mechanical or any parts in actual use. All parts are sold as restoration pieces which may or may not require replacement or additional components and testing if they are to be used in a fully working machine.

Delivery

All parts can be posted by signed for, special or courier delivery to UK, EU and worldwide at cost.