Pre-65 Bikes

Anybody know anything about alloy clutch baskets etc to fit BSA B40 ?? Seen one or two bikes advertised and they apparently have alloy clutches. Assume this is not just to save weight but as it is rotating mass will by reducing the amount of inertia enable the engine to "pick up" sharper ? Any of you guys had any experience ? is it a worthwhile mod? If so where can you get one?

Has anyone tryied the B40 alloy silencers advertised on this e-bay site ? http://stores.ebay.co.uk/Race-Supplies-Dir...5QQftidZ2QQtZkm

There have been a lot of contributions of late about Cubs and the building and setting up thereof. Well for my sins i an in the final stages of building a B40 so what are the recommendations for a B40? You know the usual stuff? Carb size and type. High Comp or Low comp piston. Sports or road cam. Gearing. Michelin or IRC tyres. (While I'm at it I've been told that tubeless Michelins are slightly softer construction than tubed ones. Is this true?) My bike has a Faber frame and Betor front forks and has a Ex WD GB B40 Engine at present with points on sidecover but has had them removed and a PVL ignition fitted. I was thinking of fitting a Amal Mk 1 Concentric 26mm NB…

Hi there I've been offerd a b40 bsa otter fully rebuilt for 3 k foster frame . Tiger cub hubs complete engine rebuild new carb etc is this about the going price these days

Chain / tyre clearance on my B40 is minimal, I dont think the rear whel can be dished enought to give adequate clearance. Has anybody put a spacer between the sprocket and hub, then made new axel spacers to effectivly move the wheel away from the chain by a corresponding amount ? There is plenty of clearance to the right of he tyre. While I'me picking your brains, I've noticed that if I leave the bike with piston at TDC that it doesn't wet sump as quickly, is this something to do with where the oil pump positon in its stroke ?Thanks in advance for any thoughs / observations. Ross

Was looking on ebay and saw this http://cgi.ebay.co.uk/BSA-B40-350cc-TRIALS...A1%7C240%3A1318 What have they done to the right casing ? Says Rex Gaunt ignition, how does that work ?

Help Just discovered play between the clutch centre and basket on my B40. How much is acceptable, if any ? Might new roller bearings help, or is it time for (gulp) new clutch assembly. Any info appreaciated. Ross

Hi I am, amongst other things, in the process of rebuilding / modifying a BSA B40 ex WD for trials. I've ordered an Otter frame and when that arrives i will start putting things together. My engine is a 67 with points on the side cover but i was thinking of scrapping the current ignition, zener diode rectifier capacitor etc, and substituting a modern electronic set up. I've been looking at the one made by Rex Caunt do any of you have any experience of this ?? or is there a better alternative?? Finally ANY suggestions of useful mods that you guys have found worth incorporateing into the bike would be most appreciated.

What needs to be done to convert a B40 army type frame to trials spec please.

Here are a couple of pics of the b40 i bought last week

Hi All I recently changed the fork oil on my WD B40 and replaced it with 200ml TQF per leg , as before. Now they're topping out, I added 20ml extra per leg but all that did was reduce the movement, and still topped out. The forks are standard issue BSA with external springs. Any thoughts appreaciated. Ross

Hi, Be great if anybody could help - I have the opportunity to acquire B40GB engine no. 4640 with different frame number, I can't make head nor tail of which year this machine would be etc on the bsa owners website list can anyone help? Thanks Manzi

Hi Guys Bsa B40 with wd ratios Sometimes will ,but mostly not select 4th Then will not select 3rd Gearchange is a bit wooly New plungers on the gearshaft new bearings etc Tried differnt quadrants Anyone no where to look next? Marty D

Gents is this a left or right handed thread, before I give it some welly tonight?

Just managed to get a nice GB motor, but it has no clutch, covers,etc Has anyone fitted a belt primary ? pref with electronic ignition.

can anyone tell me if there is a supplier of B40 high comp pistons in the UK ?

hi all, having obtained a b40 to convert into trials mode and starting to checkout other photos it looks like people change the wheel hubs or can standard road going hubs be used,also can the hubs be laced up to have a 18" rear and a 21" front wheel?.

Hi all, I am just building up an iron barrel B40 from a box and need to get my paws on a first oversize piston kit - any ideas where from ro what alternative people use? As it's for trials, should it be a low compression piston? Your help much appreciated!

Hi all. I have just put a PVL ignition on my BSA B40 trialer care of mr Whitton and reduced the carb down to a 626 as I had got one to hand. It started first time and seemed to run a lot better straight away low down. It's still missing a bit at the top and that's not if I snap the throttle open. Going to check the tappets next and then put a new plug in. I have got some NGK BP6ES plugs so was going to run it on that. They are the extended nose ones. Thought I'd ask what the thoughts of other people were though. Cheers Steve.

Can anyone give me some pointers on a new B40 Project. I've been riding a pretty standard GB B40 frame forr a couple of years and would like to make the steering a bit tighter, anyone got any dimensions or offer any help? Mine has always been a bit of a sod when its hot. Anyone using an alloy barrel, if so where from.. thanks.