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Sloper kickstart issues #738204
06/10/18 12:11 am
06/10/18 12:11 am
Joined: Aug 2016
Posts: 55
Canterbury, New Zealand
B
BevanC Offline OP
BritBike Forum member
BevanC  Offline OP
BritBike Forum member
B

Joined: Aug 2016
Posts: 55
Canterbury, New Zealand
Hi folks,
The kick start on my 1929 ohv Sloper doesn't engage with the rachet until almost horizontal; even then, it jams, so that I have to use the clutch to depress it a bit more before I can kick it over. This means that there is a quite small angle through I can actually kick the engine over.

I've made a short video clip showing the ks rest position, the angle that it first starts to engage with the rachet, and a view down the oil filler of the quadrant rotating:

https://youtu.be/CV24Rj3COAA

I know that it is common to relieve the first quadrant tooth to stop the jamming issue, which would also increase the angle before it first engaged, but it does not appear that this has been done to mine. I'm reluctant to do that since it will make the limited kick start travel even worse.

So, my questions are:
- is the angle at first engagement typical for this bike/gearbox ? It appears to have the correct kick start mechanism.
- what could I do to prevent the jamming other than filing off the leading tooth ?
- how could I increase the effective angle of travel to make starting easier ?

I realise that I need to take the box apart to investigate further, but it would be helpful to get some suggestions about what to look for etc beforehand.

Cheers,
Bevan

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Re: Sloper kickstart issues [Re: BevanC] #738323
06/11/18 4:46 am
06/11/18 4:46 am
Joined: May 2004
Posts: 3,862
Sydney Australia
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BSA_WM20 Offline
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BSA_WM20  Offline
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Joined: May 2004
Posts: 3,862
Sydney Australia
I gather this problem is with a new rebuild and not something just happened.
The immediate assumption would be either the quadrant or the pawl is the wrong part.

As BSA made their own boxes using many common parts oft with several similar looking parts machined from the same forging or casting there is a good chance of them being wrong.
Got a few boxes from the same era that one day might see active service ( if I live long enough ) and most of them grab after aboyt 30 deg or pedal movement.

Last edited by BSA_WM20; 06/11/18 4:48 am.

Bike Beesa
Trevor
Re: Sloper kickstart issues [Re: BevanC] #738325
06/11/18 5:06 am
06/11/18 5:06 am
Joined: Aug 2016
Posts: 55
Canterbury, New Zealand
B
BevanC Offline OP
BritBike Forum member
BevanC  Offline OP
BritBike Forum member
B

Joined: Aug 2016
Posts: 55
Canterbury, New Zealand
Thanks Trevor. The bike was rebuilt by Motomania in Hungary, so I have no idea of the nature of work done. Will take it apart in due course and see what's what.
Cheers, Bevan

Re: Sloper kickstart issues [Re: BevanC] #738503
06/12/18 1:10 pm
06/12/18 1:10 pm
Joined: May 2004
Posts: 3,862
Sydney Australia
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BSA_WM20 Offline
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BSA_WM20  Offline
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Joined: May 2004
Posts: 3,862
Sydney Australia
The quadrant should have been a forging so should have the unmachined forging number on it.
It should be a few digits different to the parts number in the parts book.
Again if the same forging was used on a lot of bikes then that will not be of too much help.

Deades ago I started on a project to load all of the BSA numbers into a searchable database.
Gave up on it . Now that OCR has improved no end there is a slim chance of getting back into it as all the old heads who could tell you it was used on the Model R's & W's except for the USA expors are falling offtheir perches.


Bike Beesa
Trevor

Moderated by  Allan Gill, Jon W. Whitley 


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