{"id":31,"date":"2025-08-12T21:57:34","date_gmt":"2025-08-13T01:57:34","guid":{"rendered":"https:\/\/blog.brainwalkers.ca\/?page_id=31"},"modified":"2025-11-22T10:50:27","modified_gmt":"2025-11-22T15:50:27","slug":"technical-b40-specs","status":"publish","type":"page","link":"https:\/\/blog.brainwalkers.ca\/index.php\/technical-b40-specs\/","title":{"rendered":"Technical B40 specs"},"content":{"rendered":"\n<p>Interesting article worth a read<br><a href=\"https:\/\/www.wikiwand.com\/en\/articles\/BSA_B40\">BSA B40 &#8211; Wikiwand<\/a><\/p>\n\n\n\n<!-- Global style for the page -->\n<style>\nbody {\n    font-family: Arial, Helvetica, sans-serif;\n    line-height: 1.5;\n    color: #222;\n}\nh1 {\n    text-align: center;\n    margin-bottom: 30px;\n    font-size: 32px;\n}\nh2 {\n    margin-top: 40px;\n    margin-bottom: 15px;\n    font-size: 24px;\n    color: #003366;\n    border-bottom: 2px solid #003366;\n    padding-bottom: 5px;\n}\ntable {\n    width: 100%;\n    border-collapse: collapse;\n    margin-bottom: 30px;\n    table-layout: fixed;\n}\ntable th, table td {\n    border: 1px solid #999;\n    padding: 8px;\n    text-align: left;\n    word-wrap: break-word;\n}\ntable th {\n    background-color: #f2f2f2;\n}\nul {\n    margin-bottom: 30px;\n}\nimg {\n    max-width: 48%;\n    margin-bottom: 20px;\n    margin-right: 2%;\n}\n\n\/* Fix first (banner) image width *\/\nimg:first-of-type {\n    max-width: 100%;\n    width: 100%;\n}\n<\/style>\n\n<!-- Header -->\n<h1>BSA 1961 350 Star \u2013 B40 Technical Specifications<\/h1>\n<img decoding=\"async\" src=\"https:\/\/blog.brainwalkers.ca\/wp-content\/uploads\/2025\/08\/IMG_9741-scaled.jpeg\" alt=\"BSA 1961 350 Star\">\n\n<!-- Engine -->\n<h2>Engine<\/h2>\n<table>\n<tr><th>Specification<\/th><th>Details<\/th><\/tr>\n<tr><td>Engine Type [SN B40.1318]<\/td><td>BSA B40 single-cylinder, OHV<\/td><\/tr>\n<tr><td>Displacement<\/td><td>343 cc<\/td><\/tr>\n<tr><td>Bore x Stroke<\/td><td>70 mm x 90 mm<\/td><\/tr>\n<tr><td>Compression Ratio<\/td><td>8.5:1<\/td><\/tr>\n<tr><td>Max Power<\/td><td>19 hp @ 5,800 rpm<\/td><\/tr>\n<tr><td>Ignition<\/td><td>Magneto<\/td><\/tr>\n<tr><td>Carburetor<\/td><td>Amal Monobloc 376\/376<\/td><\/tr>\n<tr><td>Cooling<\/td><td>Air-cooled<\/td><\/tr>\n<\/table>\n\n<!-- Transmission & Drive -->\n<h2>Transmission &#038; Drive<\/h2>\n<table>\n<tr><th>Specification<\/th><th>Details<\/th><\/tr>\n<tr><td>Gearbox<\/td><td>4-speed manual<\/td><\/tr>\n<tr><td>Final Drive<\/td><td>Chain<\/td><\/tr>\n<tr><td>Clutch<\/td><td>Wet multi-plate<\/td><\/tr>\n<\/table>\n\n<!-- Chassis & Suspension -->\n<h2>Chassis &#038; Suspension<\/h2>\n<table>\n<tr><th>Specification<\/th><th>Details<\/th><\/tr>\n<tr><td>Frame Type [SN: B40.1296]<\/td><td>Single cradle steel<\/td><\/tr>\n<tr><td>Front Suspension<\/td><td>Telescopic forks<\/td><\/tr>\n<tr><td>Rear Suspension<\/td><td>Swingarm with twin shocks<\/td><\/tr>\n<tr><td>Front Brake<\/td><td>Drum, 7-inch<\/td><\/tr>\n<tr><td>Rear Brake<\/td><td>Drum, 7-inch<\/td><\/tr>\n<tr><td>Wheelbase<\/td><td>53 in (approx.)<\/td><\/tr>\n<tr><td>Ground Clearance<\/td><td>6.5 in (approx.)<\/td><\/tr>\n<\/table>\n\n<!-- Fuel & Performance -->\n<h2>Fuel &#038; Performance<\/h2>\n<table>\n<tr><th>Specification<\/th><th>Details<\/th><\/tr>\n<tr><td>Fuel Tank Capacity<\/td><td>3.5 gallons (16 L)<\/td><\/tr>\n<tr><td>Top Speed<\/td><td>~80 mph (130 km\/h)<\/td><\/tr>\n<tr><td>Fuel Type<\/td><td>Petrol<\/td><\/tr>\n<tr><td>Lubrication<\/td><td>Wet sump<\/td><\/tr>\n<\/table>\n\n<!-- Dimensions & Weight -->\n<h2>Dimensions &#038; Weight<\/h2>\n<table>\n<tr><th>Specification<\/th><th>Details<\/th><\/tr>\n<tr><td>Dry Weight<\/td><td>~330 lbs (150 kg)<\/td><\/tr>\n<tr><td>Seat Height<\/td><td>31 in (79 cm)<\/td><\/tr>\n<tr><td>Overall Length<\/td><td>80 in (203 cm)<\/td><\/tr>\n<tr><td>Overall Width<\/td><td>28 in (71 cm)<\/td><\/tr>\n<\/table>\n\n<!-- Notes -->\n<h2>Notes \/ Maintenance Tips<\/h2>\n<ul>\n<li>Original B40 parts are interchangeable with early Star models.<\/li>\n<li>Keep carburetor and ignition properly tuned for optimal performance.<\/li>\n<li>Drum brakes require regular adjustment for best stopping power.<\/li>\n<\/ul>\n\n<!-- Optional Gallery -->\n<img decoding=\"async\" src=\"YOUR_IMAGE_URL_HERE\" alt=\"BSA B40 Engine\">\n<img decoding=\"async\" src=\"YOUR_IMAGE_URL_HERE\" alt=\"BSA B40 Side View\">\n","protected":false},"excerpt":{"rendered":"<p>Interesting article worth a readBSA B40 &#8211; Wikiwand BSA 1961 350 Star \u2013 B40 Technical Specifications Engine Specification Details Engine Type [SN B40.1318] BSA B40 single-cylinder, OHV Displacement 343 cc Bore x Stroke 70 mm x 90 mm Compression Ratio &hellip; <a href=\"https:\/\/blog.brainwalkers.ca\/index.php\/technical-b40-specs\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_s2mail":"yes","footnotes":""},"class_list":["post-31","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blog.brainwalkers.ca\/index.php\/wp-json\/wp\/v2\/pages\/31","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.brainwalkers.ca\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blog.brainwalkers.ca\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blog.brainwalkers.ca\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.brainwalkers.ca\/index.php\/wp-json\/wp\/v2\/comments?post=31"}],"version-history":[{"count":7,"href":"https:\/\/blog.brainwalkers.ca\/index.php\/wp-json\/wp\/v2\/pages\/31\/revisions"}],"predecessor-version":[{"id":710,"href":"https:\/\/blog.brainwalkers.ca\/index.php\/wp-json\/wp\/v2\/pages\/31\/revisions\/710"}],"wp:attachment":[{"href":"https:\/\/blog.brainwalkers.ca\/index.php\/wp-json\/wp\/v2\/media?parent=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}