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.

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%.

OIL PUMP – COMPLETE -OVERHAULED .

HAS GOOD RESISTANCE WHEN TURNED .

N.O.S TAPPET GUIDES 66-1494.

AS NEW GOOD FOR INLET OR EXHAUST.

BARREL AND PISTON – + 20. GOOD THICK FINS .

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

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 .

EXHAUST LIFTER LEVER- 66-1431.

A GOOD USED LEVER .

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.

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 .

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 . IT HAS A LOOSE EXHAUST VALVE INSERT SO WILL NEED SORTING BEFORE USE.

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

MAGDYNO IDLER PINION -66-2250.

USED & RE USEABLE, CLEAN AND FIT .

OIL PUMP FILTER – BRASS – 66-2623

USED IN GOOD CONDITION .

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

STILL IN PRESERVATIVE .

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 .

EXHAUST LIFTER SPINDLE – 66-1435.

USED & RE USEABLE.SPLINES LOOK GOOD .

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

CLEANED AND IN BEAUTIFUL CONDITION .

INLET VALVE 66-235

USEABLE USED VALVE .

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

STILL GOT PRESERVATIVE ON IT . OFTEN BROKEN.

OIL PUMP FIXING BOLTS , 65-2604

GOOD USEABLE ORIGINAL CONDITION .