BSA Owners' Club Forum

The BSA Workshop => Singles => Topic started by: Buntington on 05 November, 2017, 16:08:35

Title: Newby B40 help
Post by: Buntington on 05 November, 2017, 16:08:35
Helppppppp... after many years away I have returned to the BSA fold with an oily rag B40.... after a few weeks of happy ownership.. I kicked it over and after a “clunk” I get no compression.. kick start returns but doesn’t turn the engine.. from my limited knowledge I am guessing broken shaft and/or kick star quadrant? ... I really want to deal with this myself but..... is this a reasonable job.. should I prepare to replace the whole mechanism whilst apart.. please tell me I don’t have to split the whole engine??? Any thoughts gratefully received, regards Mark, East Herts
Title: Re: Newby B40 help
Post by: DEREKANDERSON8 on 06 November, 2017, 07:49:06
If you remove kickstart, and gear lever you can then remove outer casing that will give you access to kickstart quadrant and spring etc, relatively simple no need to split engine or gearbox!  ;)

cheers

derek
Title: Re: Newby B40 help
Post by: Buntington on 06 November, 2017, 08:59:50
Thanks Derek! Will give it a go! 😀👍
Title: Re: Newby B40 help
Post by: ANDY HIGHAM on 06 November, 2017, 15:46:36
Before you start stripping it down, put it in gear, pull the clutch in and press the kick starter. It should turn the rear wheel, if not the problem is with the kickstart mechanism, if it does then the problem is the primary drive.
Remove the plug, put it in gear and turn the rear wheel, if the engine does not turn over the problem is the primary drive
Title: Re: Newby B40 help
Post by: Buntington on 07 November, 2017, 07:49:29
Thanks very much.. will try that tonight!😀👍
Title: Re: Newby B40 help
Post by: Buntington on 07 November, 2017, 18:13:05
Yep.. all done.. it is the kick start.. are there any worthwhile upgrades??
Title: Re: Newby B40 help
Post by: DEREKANDERSON8 on 08 November, 2017, 13:25:48
What is the problem with kick start?
Title: Re: Newby B40 help
Post by: Buntington on 09 November, 2017, 10:31:37
after a few weeks of happy ownership.. I kicked it over and after a “clunk” I get no compression.. kick start returns but doesn’t turn the engine.. from my limited knowledge I am guessing broken shaft and/or kick star quadrant? ...
Title: Re: Newby B40 help
Post by: JulianS on 09 November, 2017, 10:40:18
What year is your B40?

2 different kickstart assemblies.

Title: Re: Newby B40 help
Post by: Buntington on 10 November, 2017, 09:37:02
1962... thanks for the interest
Title: Re: Newby B40 help
Post by: JulianS on 10 November, 2017, 09:51:08
Have you fixed the problem?
Title: Re: Newby B40 help
Post by: Buntington on 10 November, 2017, 12:14:34
Not yet, hoping to take the side off for a look see over the weekend!
Title: Re: Newby B40 help
Post by: JulianS on 10 November, 2017, 14:00:06
It could be the pawl on the kickstart.

Looking at the photo from parts book you can see the pawl which engages with the pinion with ratchet inside.

BSA helpfully produced a service sheet explaining how to deal with the issue also reproduced below. B40 the same as C15 here.
Title: Re: Newby B40 help
Post by: Buntington on 13 November, 2017, 08:10:31
Now then!... that makes sense!.. Will get the part in advance and give that a go!.. thanks... I think the mechanics time of 30 mins is a bit optimistic for my skill levels ;D ;D ;D