Author Topic: Kickstart Ratchet Nut..  (Read 1251 times)

Offline brackenfel

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  • Adrian - Bristol UK
Kickstart Ratchet Nut..
« on: 06.11. 2010 16:06 »
Dear All,
Once again I'm here seeking guidance / reassurance !!
Having successfully reassembled the clutch now I'm now "tidying up" the other side..! I'd left the outer gearbox cover loose as I hadn't sorted the kickstart spring, neither had I been able to tighten up the kickstart ratchet nut properly as I wasn't able to lock the shaft easily..
Now it's in the bike I can lock the shaft but when I tighten the nut right up the whole ratchet mech tightens up too.. Can't really work out why although I have replaced the bush but that's the same as the one that came out only not worn!
If I tighten it up so that the fixed part of the ratchet is firm & the nut just about holding firm it's fine.. I'm tempted to leave it like this & use the lockwasher to keep things in one place.

Can anyone see a problem with this??

Thanks as always,

Adrian
1961 A10 650 Golden Flash - Blue
1954 BSA B33
Velocette Viper
Laverda 750 SF1
Kawasaki W650
Buell XB9S
Ariel 350NH & Matchless G3LS in bits...

Online bsa-bill

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Re: Kickstart Ratchet Nut..
« Reply #1 on: 06.11. 2010 16:19 »
interesting one this, when tightened up the ratchet ( bigger bit) should be able to move back on the bush far enough to disengage from the fixed bit ( just ).
from memory the order of things should be washer - spring - ratchet (over bush) - fixed bit - tab washer - nut
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online muskrat

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Re: Kickstart Ratchet Nut..
« Reply #2 on: 06.11. 2010 19:35 »
G'day Adrian,
                      overtightening the nut is squashing the bush out of shape and binding the ratchet. I use loctite and the tab washer with the nut just done up firm.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online bsa-bill

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Re: Kickstart Ratchet Nut..
« Reply #3 on: 06.11. 2010 20:58 »
it's a while since I was in the gearbox but thinking about it would taking a tad of the end of the bush be an issue?, allowing the nut to be tightened with out distorting the bush or am I missing something
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline brackenfel

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  • Adrian - Bristol UK
Re: Kickstart Ratchet Nut..
« Reply #4 on: 07.11. 2010 17:15 »
Thanks Muskrat & Bill,
I've had a play.. Winding the nut up the thread feels tighter than I'd expect so I've got it until it just pinches up the outer part of the ratchet, leaving the inner part free to rotate.
I did consider Bill's advice about maybe shortening the bush but the sticky thread put me off a little as I remember both ends of the s/h mainshaft I'm using had the threads slightly scuffed & it took a bit of work to get the nuts on the start of the thread.

I think I'll use the lock washer really closely peened to the nut & make sure that holds everything fast.

Thanks again for all your help...

Adrian
1961 A10 650 Golden Flash - Blue
1954 BSA B33
Velocette Viper
Laverda 750 SF1
Kawasaki W650
Buell XB9S
Ariel 350NH & Matchless G3LS in bits...

Offline benet

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Re: Kickstart Ratchet Nut..
« Reply #5 on: 03.03. 2011 07:15 »
Hi Adrian, I was just re reading your issue with the binding rachet and have had a similiar event. I dismantled the gearbox, groan, and percieved that the bronze bush on the inner end of the shaft was worn and allowing the shaft to float inwards. There should perhaps be a thrust washer in there to prevent this wear. Anyway, i measured the endfloat, found the appropriate thichness and ID washer and have put that in. It has fixed the problem. However i should add that it would be much easier to just replace the bronze bush as it is very difficult to reinsert the shaft with the washer on it.
Hope that helps
Ben   

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Re: Kickstart Ratchet Nut..
« Reply #6 on: 03.03. 2011 08:49 »
G'day Ben,
              sneaking in, un-noticed. WELCOME.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7