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Kickstart ratchet

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Kickstart ratchet

Posted by John Pullen-Appleby at August 24. 2017

Hello All

I have asked Andy but I think he is on his holidays--but--the gearbox saga continues.  I have all the bits assembled in the crankcase using the orginal bits having elected not to have a gear indicator.  There was a shim/washer missing, now replaced.

 

My question is--the parts book mentions part B 60 0431301 kick start ratchet shaft thrust washer.  I don't seem to have one.

 

Does anyone know anything about them--dimensions?  hard or not? I cannot see one on sale in the spares scheme.  All I had was as the picture shows.  Ta  JPA

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Re: Kickstart ratchet

Posted by patrick_mullen at August 26. 2017

Hello John,

I don't have any dimensions for the shim and I can't remember what it looked like. Best bet is just assemble the box and check the amount of end float and then add shims as required.  This box is well known for jumping out of first gear if there is excessive end float but you can sort it fairly easily even with the engine back in the frame.

Patrick.

 

 

 

 

 

Re: Kickstart ratchet

Posted by John Pullen-Appleby at August 26. 2017

Previously patrick_mullen wrote:

Hello John,

I don't have any dimensions for the shim and I can't remember what it looked like. Best bet is just assemble the box and check the amount of end float and then add shims as required.  This box is well known for jumping out of first gear if there is excessive end float but you can sort it fairly easily even with the engine back in the frame.

Patrick.

 

Hello Patrick,

My understanding of this bit is that it is part of the kickstart ratchet--that seems to be what the exploded view in the parts book suggests.  I thought the shims to rectify jumping out of gear were something there may or may not be depending on need--but I could be wrong.

 

How does one measure this end float?  I am presuming it it something done when the inner cover if bolted in place.  Also when the time comes to put on the outer cover--does  this picture of the odd collection of compoments in the outer cover look like they are in anything near the correct order?

 

Cheers

JPA

 

 

 

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Re: Kickstart ratchet

Posted by patrick_mullen at August 27. 2017

Hello John,

Yes you are right about the shims.  You only fit these if actually necessary.  The part number B60 is as you say 'kickstarter ratchet shaft thrust washer'and is a different item which is intended to be in that position. I can't remember what it actually looked like but I think a washer of some kind is required for the spring to seat against. But if it worked before then it should work again! At least to test the action.

I was told many years ago by a member of the NOC lightweight spares to check the end float by simply pushing/pulling on the kickstarter when assembled.  If there is any movement it might require shimming.  NOC did at one time have these shims but I don't think they have any now.  Andy would be a good man to contact about this as lightweight spares in general are getting slim.  My notes simply say 'insert shim between the kickstart and layshaft first gear '. The shims were very simple shims - probably about 10 thou.

Your picture is basically right but you are missing B13 -pawl spring washer outer.  When it all goes into position the pawl spring (B12) is enclosed between the pawl spring washer outer (B13) and the pawl spring washer inner (B14) and fits over the ratchet shaft nut (B20).  I know you already have this alloy washer B13 as you queried the original home made version.

Phew ! Bet you wish you had taken up something simple - like do-it-yourself-nuclear physics.

Patrick

Re: Kickstart ratchet

Posted by Ulrich Hoffmann at August 27. 2017

On my Commando I used the shims from the rear isolastics MK I for correcting the end float of the kicksart shaft.

Maybe this works in a lightweight gearbox too?

Don´t have it at hand right now to check the diameters.

Re: Kickstart ratchet

Posted by John Pullen-Appleby at August 29. 2017

Previously patrick_mullen wrote:

Hello John,

Yes you are right about the shims.  You only fit these if actually necessary.  The part number B60 is as you say 'kickstarter ratchet shaft thrust washer'and is a different item which is intended to be in that position. I can't remember what it actually looked like but I think a washer of some kind is required for the spring to seat against. But if it worked before then it should work again! At least to test the action.

I was told many years ago by a member of the NOC lightweight spares to check the end float by simply pushing/pulling on the kickstarter when assembled.  If there is any movement it might require shimming.  NOC did at one time have these shims but I don't think they have any now.  Andy would be a good man to contact about this as lightweight spares in general are getting slim.  My notes simply say 'insert shim between the kickstart and layshaft first gear '. The shims were very simple shims - probably about 10 thou.

Your picture is basically right but you are missing B13 -pawl spring washer outer.  When it all goes into position the pawl spring (B12) is enclosed between the pawl spring washer outer (B13) and the pawl spring washer inner (B14) and fits over the ratchet shaft nut (B20).  I know you already have this alloy washer B13 as you queried the original home made version.

Phew ! Bet you wish you had taken up something simple - like do-it-yourself-nuclear physics.

Patrick

Hello Patrick,

Thanks for this.  I'm getting there slowly.  I have lots ofd sheet ashim steel--i need to have a dry build and check for endfloat.  I do indeed have that  pawl spring cover--I bought anew one to replace the ally one.

 

It turns out that the spares scheme does have the kickstart thrust washer.

 

 

Cheers

JPA

Re: Kickstart ratchet

Posted by John Pullen-Appleby at August 29. 2017

Previously Ulrich Hoffmann wrote:

On my Commando I used the shims from the rear isolastics MK I for correcting the end float of the kicksart shaft.

Maybe this works in a lightweight gearbox too?

Don´t have it at hand right now to check the diameters.

 

Thanks Uli

 

JPA

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