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#711351 - 10/12/17 7:39 pm B40 performance V a 175cc Bantam.  
Joined: Jun 2015
Posts: 37
Nickjaxe Online content
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Nickjaxe  Online Content
BritBike Forum member

Joined: Jun 2015
Posts: 37
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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#711354 - 10/12/17 7:56 pm Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe]  
Joined: Dec 2004
Posts: 8,827
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,827
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.

#711386 - 10/13/17 1:17 am Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe]  
Joined: Sep 2004
Posts: 670
gunner Online content
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gunner  Online Content
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Joined: Sep 2004
Posts: 670
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
#711500 - 10/14/17 10:05 am Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe]  
Joined: Jun 2015
Posts: 37
Nickjaxe Online content
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Nickjaxe  Online Content
BritBike Forum member

Joined: Jun 2015
Posts: 37
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.
#711506 - 10/14/17 11:58 am Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe]  
Joined: Dec 2004
Posts: 8,827
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,827
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.

#711511 - 10/14/17 12:08 pm Re: B40 performance V a 175cc Bantam. [Re: Nickjaxe]  
Joined: Sep 2014
Posts: 412
Tigernuts Online content
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Tigernuts  Online Content
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Joined: Sep 2014
Posts: 412
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.


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