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B40 performance V a 175cc Bantam. #711351
10/12/17 7:39 pm
10/12/17 7:39 pm
Joined: Jun 2015
Posts: 72
Cheshire UK.
N
Nickjaxe Online content OP
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Nickjaxe  Online Content OP
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Joined: Jun 2015
Posts: 72
Cheshire UK.
Hi guys...I run a B175 Bantam...would like a bigger BSA to keep it company...but with more performance...not looking for a flying machine just something able to keep up with A road traffic.

I like to looks of the B40 350cc range....how do they perform.

Nick.


Recently bought my 1st ever motorcycle...a humble 1969 BSA Bantam B175...I am enjoying using my Bantam so much...does all I need.
My car that I use daily is an old series Landrover that I bought new 40 years ago and has just become tax free.
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Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe] #711354
10/12/17 7:56 pm
10/12/17 7:56 pm
Joined: Dec 2004
Posts: 9,434
Scotland
kommando Offline
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kommando  Offline
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Joined: Dec 2004
Posts: 9,434
Scotland
Well it won't keep up with A road traffic unless you wring its neck or tune it like an SS90 but then its reliability suffers, it will be fine on B roads etc. I count A road as 60 to 70 mph traffic speeds and long sweeping bends and part dual carriageway like say the A5 or A41. Think you should be looking at a twin if you are looking at the same A roads.

Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe] #711386
10/13/17 1:17 am
10/13/17 1:17 am
Joined: Sep 2004
Posts: 823
Farnham, Surrey, UK
gunner Offline
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gunner  Offline
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Joined: Sep 2004
Posts: 823
Farnham, Surrey, UK
B44's have a bit more power than B40's and might be better suited for A road use especially if you use a larger gearbox sprocket to lower the revs.

I can cruise on my B44 at around 55 to 60mph with occasional bursts up to 65mph. These speeds are just about enough for quiet A roads, however if you get on a fast A road you will struggle.

As Kommando suggests, a twin might be a better option.


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe] #711500
10/14/17 10:05 am
10/14/17 10:05 am
Joined: Jun 2015
Posts: 72
Cheshire UK.
N
Nickjaxe Online content OP
BritBike Forum member
Nickjaxe  Online Content OP
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N
Joined: Jun 2015
Posts: 72
Cheshire UK.
Hi guys...when I say A roads I was meaning the less busy single carriageway rural type type A road.

Think I would be happy if I could comfortably be able to maintain 55mph...how would the B40 cope with that...or would I have to push the poor old thing.

Nick.


Recently bought my 1st ever motorcycle...a humble 1969 BSA Bantam B175...I am enjoying using my Bantam so much...does all I need.
My car that I use daily is an old series Landrover that I bought new 40 years ago and has just become tax free.
Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe] #711506
10/14/17 11:58 am
10/14/17 11:58 am
Joined: Dec 2004
Posts: 9,434
Scotland
kommando Offline
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kommando  Offline
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Joined: Dec 2004
Posts: 9,434
Scotland
You should be ok but with caution as to which engine you get, there are 3 main variants. B40 distributor which has a fully bushed gearbox and bush timing side main bearing, B40F which has a partially bushed gearbox and bush timing side main bearing, B40G with fully bearing gearbox and ball bearing timing side main bearing. I had a distributor B40 and used it to commute Birmingham to Coventry using B roads and was continually replacing bushes in the gearbox. So best you go for a F or even better a G but both are one year only so thin on the ground. A G would be bullet proof and was also used on the B40WD which has the C15 competition frame also used on the B44.

Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe] #711511
10/14/17 12:08 pm
10/14/17 12:08 pm
Joined: Sep 2014
Posts: 692
Naarfuk, UK
T
Tigernuts Offline
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Tigernuts  Offline
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T
Joined: Sep 2014
Posts: 692
Naarfuk, UK
As Kommando says, the G engine is by far the best. Same goes for the C15G - stronger than both the later B25 engines and the earlier C15 versions, and easily capable of 55mph cruising. But you don't see them for sale very often.


If anything other than a blank space is visible here, something's wrong.
Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe] #712664
10/25/17 3:06 pm
10/25/17 3:06 pm
Joined: Sep 2015
Posts: 313
Kent, England
J
John Alexander Offline
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John Alexander  Offline
BritBike Forum member
J
Joined: Sep 2015
Posts: 313
Kent, England
Even a BSA C15 would maintain 55 MPH cruising all day, the B40 is not quite so revvy but that should be ok as well. My very first bike was a C15 and i happily cruised it at 60 MPH. Used to take it in the intermediate gears up against my mates to 45 in first, 60 in second and 75 in third, by the Smiths speedo anyway. Had a tuned BSA Starfire, and with raised gearing and revving to 9,000 would do 90 MPH i third and 95 in top. point is, i've owned a B40 but found the standard 1966 BSA C15 better.
Goldie John.

Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe] #712677
10/25/17 4:56 pm
10/25/17 4:56 pm
Joined: Aug 2015
Posts: 1,207
Bolton Lancs UK
A
Andy Higham Online content
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Andy Higham  Online Content
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Joined: Aug 2015
Posts: 1,207
Bolton Lancs UK
I would like to throw another bike into the mix. The B31/B33, its a physically bigger bike so would be less cramped especially for a taller rider. The engine is very strong, tuneable and looks just gawjus


1955 BSA B31 500cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350
1967 Greeves 360 Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc "Llareggub"
2003 Aprilia RSV Mille "Lo Stregone"
Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe] #712784
10/26/17 2:11 pm
10/26/17 2:11 pm
Joined: Sep 2015
Posts: 313
Kent, England
J
John Alexander Offline
BritBike Forum member
John Alexander  Offline
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J
Joined: Sep 2015
Posts: 313
Kent, England
My friend has a B31 along with 6 other classic bikes and he loves it to bits.


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