Author Topic: Newby B40 help  (Read 320 times)

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Buntington

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Newby B40 help
« 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

DEREKANDERSON8

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Re: Newby B40 help
« Reply #1 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

Buntington

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Re: Newby B40 help
« Reply #2 on: 06 November, 2017, 08:59:50 »
Thanks Derek! Will give it a go! 😀👍

ANDY HIGHAM

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Re: Newby B40 help
« Reply #3 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

Buntington

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Re: Newby B40 help
« Reply #4 on: 07 November, 2017, 07:49:29 »
Thanks very much.. will try that tonight!😀👍

Buntington

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Re: Newby B40 help
« Reply #5 on: 07 November, 2017, 18:13:05 »
Yep.. all done.. it is the kick start.. are there any worthwhile upgrades??

DEREKANDERSON8

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Re: Newby B40 help
« Reply #6 on: 08 November, 2017, 13:25:48 »
What is the problem with kick start?

Buntington

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Re: Newby B40 help
« Reply #7 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? ...

JulianS

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Re: Newby B40 help
« Reply #8 on: 09 November, 2017, 10:40:18 »
What year is your B40?

2 different kickstart assemblies.


Buntington

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Re: Newby B40 help
« Reply #9 on: 10 November, 2017, 09:37:02 »
1962... thanks for the interest

JulianS

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Re: Newby B40 help
« Reply #10 on: 10 November, 2017, 09:51:08 »
Have you fixed the problem?

Buntington

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Re: Newby B40 help
« Reply #11 on: 10 November, 2017, 12:14:34 »
Not yet, hoping to take the side off for a look see over the weekend!

JulianS

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Re: Newby B40 help
« Reply #12 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.
« Last Edit: 10 November, 2017, 14:02:59 by JulianS »

Buntington

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Re: Newby B40 help
« Reply #13 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