Bsa b40 engine tuning book

As established classic motorcycle dealers in the uk, we have a long history of offering a range of classic motorcycles for sale to customers all over the world. Lots of people charge for motorcycle service and workshop manuals online which is a bit cheeky i reckon as they are freely available all over the internet. The best bsa quarter litre plus engine that we can build for trials, with a few more options. The a in a65 was to represent the group that the a65 belonged to. Truth be told, the first bike i was lent was a development b40 350cc single, this was to get me to college while my own bike, a b44 was off the road. A smaller diameter pipe gives a slight improvement in performance. The engine bsa c15, b40, b25, b44, b50, triumph tr25w paperback. Developed from the bsa c15, the machines were produced between 1961 and 1967 for civilian use. Bsa wd b40 picture gallery guest book how to contact us other motorcycles in my.

Well, went to see a lady about this bike she had in her back yard for a number of years, she didnt know alot, she said its a bsa, and its rusty sadly it wasnt a goldstar, i half expected it to be a bantam, but instead it was a 1963 bsa b40 350. The rupert ratio unit single engine manual for bsa c15, b40, b25. Rupert ratio bsa unit single book british cycle supply. Bsa power unit small petrol engine 50cc modified 1. Tuning tips abound as long as you are brave enough to try them as they often involve metal removal so permanent.

The new 350 cc engine had 21 bhp, which gave a cruising speed of 50 55 mph and. B50 modification page welcome to the world of bsa b50. If you are in need of a particular classic motorcycle, or have one to sell, get in touch. Year bike picture description 0 bsa b40 scrambler 0 bsa b40 trials b40ss90 196065, 343cc, ohv single, 305lb, 80mpg, 75mph. Make offer d1 d7 c15 c15t c15s b40 m21 a7 a10 bsa motorcycles data book printed 1960. Two stories about the bsa b40 of 1967 leading to the. The 1967 bsa b40 wd was adopted by the british army to replace the aged m20 that had seen service before the second world war if you have been a follower of this web site you will know by now that most of the early development work on the bsa b40wd was done by my friend pat slinn from the bsa competition department. Everything from tuning the carb to a complete engine rebuild is. History technical information official mod up dates and modifications engine number prefixes identification brass plate numbers explained bsa wd b40 contract numbers.

I have been working on my c15s brakes and forks for ages and finally i am getting near to working on the engine. New edition of bsa unit singles is identical to the previous book but has an additional section which provides some further information on the vertical oil pumps, low oil pressure, b50 oiling, c15 and b40 steel flywheels, wide ratio gears. It has a b50 frame, a b40 engine cases, b44 top end, horse power by stan the bike also has a ss set up with gold star pistons. Bacon book says c15ts had different cams in different years. Now it can be removed with the engine in the frame.

The bsa b40 was a series of 350 cc 21 cu in unit construction singlecylinder ohv fourstroke motorcycles made by the birmingham small arms company. I have started on restoring a bsa b40 wd the frame number is b40gd1125 and engine number b40gd237 i am having a hard time finding out how to get parts. Parts for sale engine bsa wd b40 parts for sale parts for sale frame and chassis bsa wd b40 parts for sale parts for sale electrical bsa wd b40 parts for sale ratio rebuilds bsa unit single rebuilds and engine services. As it has later forks from 73 onwards i believe the engine is tilted back a bit. Books about bsa motorcycles books that are not on hand can be put on a to be. For general parts, please see the product index on the left. Everything from tuning the carburettor to a complete engine. Ok, its been a long time coming but we need to get this act together. The empire star was a standard motorcycle made by bsa at their factory in small heath. The rupert ratio unit single engine manual for bsa c15, b40, b25, b44, b50 by rupert ratio get other bsa motorbike repair manuals here armed with this book even the least experienced spanner man will be able to not only rebuild a bsa unit single, but make it go better and more reliably than even bsa thought possible. Bsa power unit small petrol engine 50cc modified mainland only, scottish highlandslowlands and other regions will differ, no international shipping if you require an. C15b40 distributor engine inner timing cover 1959 to 1964, clutch centre base plate, b25 tuning tips, and tuning tips to make the umble ceefer fly. Everything from tuning the carburettor to a complete engine rebuild is described in great detail with a host of illustrations to make the job easier.

The 65 was short for 650 which represented the capacity of the motor. The book featured grainy black and white pictures of contemporarystandard restorations backed by owners testimonials. We advise all of our customers to have a genuine parts book as it allows you to see exploded views of the parts you need along with the quantities. Suitable for bsa b40 ss90 196470 b44 victor 196670 points on side models. I assume the engine modifications are possibly different for the c15, b25, and b40. The rupert ratio unit single engine manual for bsa c15, b40, b25, b44, b50 by rupert ratio armed with this book even the least experienced spanner man will be able to not only rebuild a bsa unit single, but make it go better and more reliably than even bsa thought possible. The rupert ratio unit single engine manual book depository. I have been reading the advice that i have received from this site before on increasing the performance of the engine, trying to settle upon the most sensible modifications, short of fitting a larger motor altogether. The bsa b40 was a series of 350 cc 21 cu in unit construction singlecylinder ohv fourstroke. Bored out version of the c15 with greater torque and enclosed pushrods. Engine gasket set bsa b40b44 196470 british bike bits. If you are a fairly confident home mechanic then this book is perfect. Parts for sale engine bsa wd b40 parts for sale parts for sale frame and chassis.

Get the best deals on motorcycle parts for bsa b40 when you shop the largest online selection at. This book is identical to the earlier edition but contains some 20 pages of additional information in total on cam profiles,vertical oil pumps,oil pressure, c15 and b40 flywheels, wide ratio gears, c15 and b40 distributor timing covers, and tuning tips for the c15 and b25. Bsa service chart poster c15 b40 star 250 350 top end, timing, tuning mc2 p12. Bsa engine tuning,c15 b25,b,40,b44,b50, engine tuning, high compression, twin plug, 500cc, 350cc,250cc race chassis, trials chassis, motocross chassis, mx chassis, grasstrack chassis, motocross mx engine tuning shop and number one choice for grasstrack and speedway chassis. The purpose of bsa unit singles llc is to provide enthusiasts of c15s, b40s, c25s. There i found a paean of praise to the bsa b40, backed up by bsa club stalwart and comfortingly young geezer owen wright talking about how wonderful was his own b40 ss90. Great savings free delivery collection on many items. Grasstrackparts, buying grasstrackproducts, best engine tuning and rebuilding in the business. Engine tuningrtsbsa motocross, trials, grasstrack, road. The rupert ratio unit single engine manual for bsa c15, b40, b25, b44, b50 ratio, rupert on. Military versions were manufactured from 1967 to 1970. The purpose of bsa unit singles llc is to provide enthusiasts of c15s, b40s, c25s, b25s,t25s, b44s and b50s with a single source supplier for parts and accessories for these models.

Bsa b40 spares list parts catalog book 1b40 1960 005093. Grasstrackparts, buying grasstrackproducts, best engine tuning and rebuilding in the. Competition items controls electricallights engine exhaust fasteners. I noticed that oil was leaking from the kickstart hole and thought this was maybe due to the angle the engine was at. Bsa engine tuning,c15 b25,b,40,b44,b50,engine tuning, high compression, twin plug, 500cc, 350cc,250cc race chassis, trials chassis, motocross chassis, mx chassis, grasstrack chassis, motocross mx engine tuning shop and number one choice for grasstrack and speedway chassis. Sound construction and usually reliable if treated kindly. Vintage bsa b40 engine gasket set its sealed bsa bantam old pair of badges and clips one is faded different colour good for unrestored look some marks. This book is identical to the earlier edition but contains some 20 pages of additional information in total on cam profiles,vertical oil pumps,oil pressure, c15 and b40 flywheels, wide ratio gears, c15 and b40 distributor timing covers, and tuning tips for the c15 and. Another with scans of official bsa workshop manuals and owners books. Bsa engine for sale in uk 48 secondhand bsa engines. Bsa motorcycle workshop manuals, parts manuals and instruction books for most classic models. Off i went to development to pick up the bike and there was this sad and dirty b40 leaning against a wall.

Cylinder barrel 79mm bsa b44 196667 british bike bits. The rupert ratio unit single engine manual for bsa c15. Why the 1970 bsa a65 is the best year classic british spares. Haynes 127 owners repair manual bsa unit singles 19581972 247, 343, 441, 499cc.

View and download bsa c15 instruction manual online. The rupert ratio bsa unit singles manual c15, b40, b25, b44, b50. Enter your email address to receive alerts when we have new listings available for bsa engines for sale. A good mod is to toss the nine retaining studs, helicoil the head and then use allen bolts to secure the box. The book includes wiring diagrams, complete specifications, hundreds of illustrations, a wealth of invaluable advice and tuning tips to make your unit single. Here at scr classics, we have over 20 years experience of tuning and improving vintage and classic motorcycles for racing and for road use recent wins include ducati club race, assen. The series was succeeded by the a65 unit construction models. The 1966 bsa b40 sports an aircooled, fourstroke, 343cc, single cylinder powerhouse mated to a fourspeed manual transmission with a footoperated gearshift and can produce a claimed 20. A problem with the b50 head is that youve got to take the engine out to remove the rocker box. Bsa rupert ratio c15 c25 b25 b44 b50 engine manual bsa. This focus has allowed us to concentrate our resources to increase the probability of our customers finding more items related to these bikes in one place.