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.

BSAWM20 ENGINE -WM20 67435-A 1942 ENGINE FROM CONTRACT C12424.COMPLETE AND RUNNING .

MY LAST COMPLETE ENGINE - USED & USABLE -FINS ARE GOOD BUT HAS DONE MORE WORK THAN ITEM 55088.

BSA WM20 ENGINE NUMBER -WM20 23815. A 1940 NUMBER . COMPLETE AND RUNNING ENGINE .

GOOD FOR ITS AGE AS +20 AND THE THICK FINS WILL SEE MOST OF YOU OUT !

CRANKCASE AIR PRESSURE RELEASE UNIT -COMPLETE .

WORKS AND ORIGINAL CADMIUM STILL

CRANKCASE PLUG SCREW -27-181.

FITTED ON WW2 M20 - BLANKS OFF OIL TAKE OF TO TELLTALE OF 39/40 BIKES .

LATE WAR TIMING COVER WITH GOOD QUILL.

IN CHOCOLATE BROWN-A GOOD CLEAN COVER.

VALVE SPRING COLLARS WITH SPLIT COLLARS.-66-221 & 66-222.

USED & USEABLE CONDITION- A1 CONDITION .

BARREL & PISTON – STANDARD ! – LITTLE USED WITH ALL FINS INTACT .

A LOVELY BARREL & RARE TO GET ONE IN THIS EXTERNAL CONDITION .

SET OF ENGINE STRAPS -COMPLETE FOR SECURING MAG DYNO.

A GOOD USEABLE SET MADE WHEN THINGS WERE PROPERLY MADE !

WW2 CRANKCASE SET – MATCHING PARTS -1944- STUNNING !

AS NEAR AS N.O.S THAT YOU WILL FIND .

SPECIAL OIL PUMP FIXING BOLTS – 65-2604.

USED & REUSEABLE GENUINE PARTS .

OIL PUMP DRIVE SPINDLE – GENUINE BSA FROM WW2 .

IN A1 CONDITION -VERY LITTLE WEAR .

PAIR OF CAM PINIONS WITH BUSHES.

A STUNNING PAIR OF CAMS -A1 CONDITION - not discounted .

PAIR OF CAM PINION SPINDLES .

USED - IN GOOD CONDITION .

GEAR PLATE AND CAM PLATE BOLTS. -SET.

ALL GOOD WITH CORRECT WASHERS .

TIMING GEAR PLATE WITH BUSH – 66-2008.

AS NEW ! GIVES YOU AN IDEA OF HOW GOOD THESE ENGINE PARTS ARE .

PAIR OF VALVE SPRINGS .31-106.

USED & REUSEABLE GENUINE PARTS .

ENGINE SHAFT TIMING PINION. 65-692.

A1 CONDITION -USED PART THATS NOT BEEN DAMAGED .

COMPLETE INLET TAPPET SET WITH ITS ORIGINAL GUIDE .

LOVELY CONDITION - RARELY FOUND IN THIS CONDITION.

COMPLETE EXHAUST TAPPET SET WITH ITS ORIGINAL GUIDE.

VERY LOW MILAGE -MINIMAL WEAR -AS NEW .

MAIN BEARINGS SET – GENUINE FROM 1944.

A GOOD USEABLE SET MADE WHEN THINGS WERE PROPERLY MADE !

MAGNETO DRIVE .

USED & RE USEABLE, CLEAN AND FIT .

A BARREL WITH NO MAJOR DAMAGE ON +40.- WILL NEED A REBORE -SEE DESCRIPTION .

ALTHOUGH ON +40 WITH A GOOD BORE UNFORTUNATELY IT HAS DONE MANY MILES WITH A BENT CONROD ! ITS NOW WORN HEAVILY IN ONE PLACE AND WILL NEED A + 60 OR THIS +80 OR SO PISTON FITTED .

NOTICE – PLEASE READ -ALL PROCEEDS TO CHARITY AS CLOSING DOWN -SEE HOMEPAGE – TO GET DISCOUNTS SPEND OVER £100 .

DUE TO THE LARGE AMOUNT OF ORDERS , MANY THAT YOU DO NOT SEE, I AM NOW DOWN TO THE VERY LAST BSA AND MY OWN PERSONAL PARTS , ALL OF THESE , AS YOU MIGHT EXPECT ARE WW2 , GENUINE & A FEW VERY RARE PARTS . FROM 1ST MAY  SOME RARE  PARTS WILL SAY  NOT DISCOUNTED  . IF NOT MARKED THEN STOCK WILL STILL CARRY A DISCOUNT OF A VARIABLE RATE OF 10-20%.

N.O.S TAPPET GUIDES 66-1494.

AS NEW GOOD FOR INLET OR EXHAUST.

COMPLETE FLYWHEEL & ROD ASSEMBLIES .- SOME ARE STEEL SETS 66-635 – 4 LEFT.

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

WW2 TIMING COVER. 66-1918.

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

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

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

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

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

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

SOME RUST BUT THEY CLEAN UP AND STILL GOOD SPRING.

SET OF 10 HEADBOLTS .

A USED SET SO SOME RUST ON THEM .

CRANK CASE AIR RELEASE UNIT -COMPLETE,

A WORKING UNIT WITH THE FLAP WORKING AND NOT STUCK.

VALVE SPRING COLLARS -PAIR.

USED AND RE USEABLE PARTS .

ENGINE SHAFT TIMING PINION 65-692.

A GOOD USED PART A1 CONDITION.

USED & USEABLE CONDITION.

CRANK CASE SCAVENGE FILTER -BRASS .

USED & RE USEABLE, CLEAN AND FIT .

OIL PUMP DRIVE SPINDLES .

USED - BEST CONDITION .

PAIR OF CAM PINIONS WITH BUSHES.

A USED INLET & EXHAUST SET OF CAMS .

TIMING CHEST PLATE WITH BEARING.

A GOOD USED & REUSEABLE PART.

ALMOST NEW -PAIR OF ALPHA VALVES .

A GOOD STRAIGHT STEM , GOOD TO USE.

OIL FLINGER PLATE – 66-2250.

USED & NEED A GOOD CLEAN TO RE-USE .

MAGDYNO HOLDING STRAP WITH BOLT .

USED & USEABLE CONDITION.

EXHAUST TAPPET HEAD .

USED & RE USEABLE, CLEAN AND FIT .

CRANKCASE SCAVENGE PLATE WITH BRASS FILTER .

USED , NEEDS A GOOD CLEAN UP, UNTOUCHED .

OIL PUMP BRASS FILTERS 66-2623.

GENUINE NOT REPRO.GOOD CONDITION.

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

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

TIMING CHEST PLATRE WITH BEARING – 65-2008.

A GOOD PLATE THATS HAD OIL REMOVED HENCE LIGHT RUST .

CRANK SHAFT DISTANCE COLLAR – 66-660.

USED & RE USEABLE . NEED A GOOD CLEAN.

TIMING CHEST PLATE WITH BEARING -65-2008.

A GOOD CONDITION USED PART .

BARREL WITH GOOD FINS . WITH BARE +60 PISTON .

THIS BARREL WAS GOT READY FOR A FUTURE REBUILD SO ALMOST EXTERNALLY PERFECT . THE EXHAUST VALVE INSERT WILL NEED CUTTING BEFORE USE AS ITS NOT BEEN FITTED SQUARE !

EXHAUST TAPPET HEAD. 66-1498.

GOOD CONDITION -HAS SEEN LITTLE USE .

ENGINE CRANKCASE BOLTS X 3.

GENUINE 3 BOLTS FROM BSA .

COMPLETE EXHAUST LIFTER ASSEMBLY.

CORRECT ARM , SOME WEAR ON SPINDLE THROUGH USEAGE .

STANDARD PISTON WITH RINGS , PIN & CIRCLIPS .

A USED PISTON THATS USEABLE .

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

MATCHING CASES , WAS RUNNING , WORKSHOP PLATE ON SIDE .

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

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

OIL PUMP FILTER – BRASS – 66-2623

USED IN GOOD CONDITION .

CRANKCASE SCAVANGE COVER . 66-2611

A GOOD UNDAMAGED COVER.

N.O.S EXHAUST VALVE LIFTER BUSH.

STILL IN PROTECTIVE GREASE .

BSA M21 HEAD BOLTS.-8.

LONGER THAN M20.

CRANKCASE OIL PIPE ADAPTORS.

PAIR OF USED ENGINE ADAPTORS.GOOD CONDITION.

PAIR OF VALVE SPRING COLLARS – 66-221.

A GOOD CONDITION ORIGINAL PAIR.

MAGDYNO IDLER PINION-66-2250

A GOOD USED PART .

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

CLEANED AND IN BEAUTIFUL CONDITION .

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

STILL GOT PRESERVATIVE ON IT . OFTEN BROKEN.

OIL PUMP FIXING BOLTS , 65-2604

GOOD USEABLE ORIGINAL CONDITION .