1953 BSA B33

1953 BSA B33 BACKGROUND
The 500cc B33 and its smaller-sister the 350cc B31, were intended to be "everyman's motorcycles", which means basic transportation for budget-minded Brits just trying to get to work. As such, BSA kept costs low by sticking with the ancient plunger rear suspension, just as the rest of the BSA lineup was switching over to swing-arms. The 1953 BSA B33 would be the last with plungers, swing-arm rear suspension arrived for the 1954 model year. Another cost-saving measure was the cast-iron top end, as opposed to the all-alloy engine of the BSA Gold Star. It was heavy, and didn't conduct heat nearly as well, but it was cheap. The 499cc B33 was based on the 1945 348cc B31, which itself was based on a pre-war design. The B31 and B33 look identical from the outside, but in fact the B33 uses a larger Amal carburetor, larger heavier flywheels and a larger rear wheel and tire than the B31.
1953 BSA B33 DESIGN
The B31 and B33 were never intended to be high-performance, sporting bikes. These were workhorses, meant to lay down endless miles of smooth, reliable service, often with sidecar attached. To that end, BSA made them stronger than they needed to be. The B33's engine used a built-up crankshaft with two full flywheels riding on one roller bearing on the timing-side, and one roller bearing and and one ball bearing on the drive-side, with a caged double-roller bearing on the big end of the connection rod. Lubrication was by dry sump, the cam and timing gear was on the right, and the primary chain and clutch were on the left. Push rods actuated rocker arms in the cylinder year, acting on one intake and one exhaust valve, angled toward each other in a roughly-hemispherical combustion chamber (which was all the fashion, in those days). One Amal carburetor fed it and a Lucas mag-dyno gave it spark and light.
1953 BSA B33: OUR SUBJECT BIKE
This lovely example was fully restored by its owner, Michael Grimm of Colorado. Great job, Mike! After all this lovely work, he's selling it. As of this writing, April 6, 2018, it is listed for sale on our Free Classified Ads-page for just $8,000. Check it out. Here are Mike's own words about his restoration of this fine 1953 BSA B33:
"The engine was completely rebuilt: new Alpha big-end bearing, new main bearings, cylinder re-sleeved back to standard bore, NOS BSA piston. The mag-dyno was rebuilt and the gearbox overhauled. Machine has a new Amal Concentric carburetor, new rims, laced with new stainless steel spokes and new Dunlop tires.  Professionally painted in correct burgundy color, and the frame was black powder-coated. Low mileage since rebuild. Excellent running bike and perfect for a collector."
Thanks for the pictures, Mike.

1953 BSA B33 SPECIFICATIONS

Engine type

Displacement

Bore & Stroke

Compression ratio

Fuel system

Ignition system

Voltage regulator

Battery

Horsepower output

Primary drive

Clutch

Gearbox

Final drive

Suspension, front

Suspension, rear

Brake, front

Brake, rear

Tire, front

Tire, rear

Fuel capacity

Weight

Top speed

Air-cooled OHV single-cylinder 4-stroke

499cc 

85mm X 88mm

6.8:1

1- Amal 1-1/16" carburetor

Lucas MO1/6 magneto

Lucas MCR2

6-volt

23 bhp @ 5500 rpm

1/2" single-row chain

Multi-plate, wet

4-speed constant mesh, right-foot shift

Chain

Telescopic fork

Plungers

7" SLS drum

7" SLS drum

3.25" X 19"

3.50" X 19"

13.5 L

374 lbs / 170 kg

81 mph / 130 kmh


Check out these BSA BOOKS

BSA - THE COMPLETE STORY


BSA MOTORCYCLES: THE FINAL EVOLUTION


HISTORY OF BSA MOTORCYCLES


BSA: ILLUSTRATED MOTORCYCLE LEGENDS, by Roy Bacon


HOW TO RESTORE YOUR BSA ROCKET 3 & TRIDENT


CHILTON’S BSA MOTORCYCLE REPAIR & TUNE-UP GUIDE


BSA SINGLES 1945-1963 GOLD PORTFOLIO


BSA SINGLES 1964-1974 GOLD PORTFOLIO


BOOK OF THE BSA - OWNERS SHOP MA NUAL, PRE-WAR


BSA 350, 441 & 500 SINGLES, UNIT CONSTRUCTION 1958-1973


BSA CLASSIC MOTORCYCLES


BSA & TRIUMPH TRIPLES: GOLD PORTFOLIO 1968-1976


BSA UNIT SINGLES: COMPLETE STORY


BSA A7 & A10 TWINS, 1957-1962, by Haynes


BSA A50 & A65 TWINS: ALL MODELS


ILLUSTRATED HISTORY OF BSA MOTORCYCLES


BSA TWINS A7 & A10 1946-1962, GOLD PORTFOLIO


THE BSA GOLD STAR


MAINTENANCE MANUAL FOR BSA M20


SECOND BOOK OF THE BSA 500 & 650 TWIN 1962-1969


BSA PRE-UNIT SINGLES WORKSHOP MANUAL, by Haynes


TRIUMPH TRIDENT & BSA ROCKET 3 WORKSHOP MANUAL, by Haynes


BSA BANTAM WORKSHOP MANUAL 1948-1971, by Haynes


BSA UNIT TWINS, THE COMPLETE STORY


BOOK OF BSA SINGLES & V-TWINS 1936-1952


RUPERT RATIO UNIT SINGLE ENGINE MANUAL, BSA & TRIUMPH


RUPER RATIO, EVERYTHING BUT THE ENGINE, BSA & TRIUMPH


BSA A50 & A65 TWINS 1962-1973, Haynes Workshop Manual


BSA GOLD STAR & OTHER SINGLES, by Roy Bacon


BSA MOTORCYCLES SINCE 1950,BR>

BSA UNIT SINGLES OWNERS WORKSHOP MANUAL #127, 1958-1972, by Haynes


BSA TWINS 150 & 165 GOLD PORTFOLIO, by RM Clarke


ILLUSTRATED BSA BUYER’S GUIDE, by Roy Bacon


BSA BANTAM, by Owen Wright


BSA PRE-UNIT TWINS, by Mick Walker


BOOK OF THE BSA OHV & SV SINGLES - 250cc 1954-1970


BSA TWINS & TRIPLES, by Roy Bacon


TRIUMPH & BSA TRIPLES: THE COMPLETE STORY


BOOK OF BSA TWINS, ALL 500 & 650 1948-1962, by Floyd Clymer


BOOK OF THE BSA OHV & SV SINGLES 1945-1954: 250, 350, 500 & 600


BSA BANTAM BIBLE, ALL MODELS 1948-1971


WHERE BSAs DARE: BSA’s 1952 ISDT GOLDS & MAUDES TROPHY


ILLUSTRATED MOTORCYCLE LEGENDS: BSA, by Roy Bacon


BSA BANTAM ESSENTIAL BUYER’S GUIDE


BOOK OF THE BSA BANTAM


BSA 500 & 650 UNIT TWINS, Clymer Repair Manual


BSA COMPETITION HISTORY


BSA MOTOR CYCLING ANNUAL, 1937, Kindle






Please visit our
MOTORCYCLE BOOK STORE


Take a tour of our site...

HOME PAGE
Triumph Motorcycles
.....Bonneville
.....Tiger
.....Trophy
.....TR6
.....TR7
.....Trident
.....X-75 Hurricane
.....6T Thunderbird
.....5T Speed Twin
.....Daytona
.....Twenty-One
.....3T 350 Twins
BSA Motorcycles
.....A65
.....A10
.....A7
.....Gold Star
.....Bantam
.....Rocket 3
.....B50
Norton Motorcycles
.....Commando
.....Atlas
.....Dominator
.....Model 7
.....Manx
.....Navigator
AMC-Associated Motor Cycles
Matchless-AJS Motorcycles
.....G3
.....G9
.....G12
.....G80
Royal Enfield Motorcycles
.....Interceptor
.....Bullet
Ariel Motorcycles
.....Square Four
.....Red Hunter
.....Cyclone
Vincent Motorcycles
.....Black Shadow
.....Rapide
.....Comet
.....Egli-Vincent
Velocette Motorcycles
.....KSS
.....KTT
.....LE
.....MAC
.....Thruxton
.....Venom
.....LE
Rickman Motorcycles
Japanese Motorcycles
.....Honda
.....Kawasaki
.....Suzuki
.....Yamaha
Cafe Racers
....Triumph Cafe Racers
.....Norton Cafe Racers
.....Other Cafe Racers
Choppers & Bobbers
.....Choppers
.....Triumph Choppers
.....BSA Choppers
.....Rat Bikes
Classic Racing Motorcycles

Classic Motorcycle Events
.....Auctions
.....Shows
.....Rides
Classic Motorcycle Restoration
Classic Motorcycle Shops
Classic Motorcycle Clubs
Send us Pictures of YOUR BIKE
YOUR BIKE Pictures

HOME PAGE
.....About Us
.....Site Map
.....CONTACT US
.....Please visit our BLOG
.....Subscribe to our FREE e-zine BRIT IRON
.....BRIT IRON E-zine Back Issues

Visit our STORES
.....Motorcycle Books
.....Motorcycle Magazines
.....Motorcycle Calendars
.....Motorcycle Accessories
..........Motorcycle Helmets
..........Motorcycle Rain Suits
..........Motorcycle Locks & Security
..........Motorcycle T-Shirts
..........Motorcycle Diecast Models
..........GoPro Cameras
.....Motorcycle Parts
..........Motorcycle Tires
..........Motorcycle Chains
..........Motorcycle Batteries
..........Motorcycle Handlebars
.....Motorcycle Tools
..........Whitworth Tools
..........Tire Tools
..........Chain Tools

Crazy about cars, too? Check out our sister site:
www.American-Muscle-Cars.net

Back to top - 1933 BSA B33
Updated 4/6/18

Learn how to BUILD YOUR OWN WEBSITE, like I did.

BREAKING NEWS:

The New BSAs?
Insider tells all



Las Vegas Auction Week
Almost 2,000 bikes!



NEW PAGE:
Vintage Motorcycle Pictures



2018 CALENDARS ARE HERE!



Visit our new
Motorcycle Store

FLAT TIRE ON A RIDE?
Emergency Tire Repair Kit





Please visit our
MOTORCYCLE BOOK STORE


Subscribe to your favorite
MOTORCYCLE MAGAZINES





BIKES FOR SALE!
Check out our
FREE
Classifed Ads



NEW SECTIONS:

Military
Motorcycles

Brough Superior

NEW PAGES
added this month:

* 1933 BSA B33
* John's British Cycles
* 1961 Matchless G80 Typhoon
* 1958 BSA Gold Star
* Ariel Twins
* 1959 Ariel Huntmaster
* 1964 Triumph Thunderbird
* 1961 Triumph Cub
* 1959 Velocette Venom
* 1956 Triumph TR5R
* 1955 Vincent Black Prince
* 1951 Triumph Speed Twin
* 1958 Ariel Huntmaster
* 1954 Triumph T15 Terrier
* Military Motorcycles
* 1941 Harley-Davidson WLA
* 1942 Harley-Davidson WLA
* 1999 Harley-Davidson MT500
* 1957 Matchless G11
* 1955 Ariel Red Hunter
* 1953 BSA Gold Star
* 1951 BSA Gold Star
* 1949 Vincent Rapide
* 1949 Vincent Comet
* 1939 BSA Silver Star
* 1947 Mathcless G80
* 1962 Norton Dominator 88
* 1981 Rickman-Kawasaki CR900
* Brough Superior Motorcycles
* 1939 Brough Superior SS100
* 1939 Brough Superior SS80
* 1938 Brough Superior SS100
* 1935 Brough Superior
* 1926 Brough Superior SS80
* Rio Vista-Delta Ride 2018
* 1942 BSA M20
* 1971 BSA A70 Lightning
* 2014 Royal Enfield Continental GT
* 2012 Triumph Bonneville
* 2010 Triumph Bonneville
* 1955 Matchless G45
* 2007 Royal Enfield Bullet
* 2009 Triumph Bonneville 50th Anniversary
* 1941 Matchless G3
Enjoy. More coming soon...