The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Gearbox, Clutch, Primary => Topic started by: RoyC on 30.09. 2019 20:01
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Can I change this nut on my gearbox without anything falling off inside ?
Number 102 on diagram.
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Hi Roy
Looks like it fits on to the end of stud 61 so I can't see it being a problem. (Unless the stud comes out with the nut).
Jim
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Hi Roy
Looks like it fits on to the end of stud 61 so I can't see it being a problem. (Unless the stud comes out with the nut).
Jim
Thanks Jim.
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Does it not retain screw 87, which with the small bush/spacer is the anchor for the kickstart spring?
You might be lucky and avoid having to remove the gearbox outer cover when replacing it.
I'd remove the cover anyway, just to see better what's going on in there.
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Does it not retain screw 87, which with the small bush/spacer is the anchor for the kickstart spring?
You might be lucky and avoid having to remove the gearbox outer cover when replacing it.
I'd remove the cover anyway, just to see better what's going on in there.
I think that you have it, Draganfly call it - 'Kickstart spring screw lock nut'
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Hi Roy,
The screw is threaded through from the inside and should not move when the nut is removed
If the thread on the screw and that in the case are sound, it should be no problem
John
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Roy, a small caveat. If the existing nut is tight on the thread, removing it will tend to tighten the kickstart spring retaining bolt..part 87. This is fine. But if the new nut is tight on the thread, it will tend to grip the bolt and loosen it as you rotate the nut...a bad thing. Ideally the new nut should spin easily down the bolt thread and nip up nicely, without disturbing the bolt. As described it is just an added locknut for the bolt.
It's nothing to do with part 61...these four studs have the reduced size plain and awkward hexagon nuts, part 106, but difficult to see from the diagram.
Swarfy.
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Roy, a small caveat. If the existing nut is tight on the thread, removing it will tend to tighten the kickstart spring retaining bolt..part 87. This is fine. But if the new nut is tight on the thread, it will tend to grip the bolt and loosen it as you rotate the nut...a bad thing. Ideally the new nut should spin easily down the bolt thread and nip up nicely, without disturbing the bolt. As described it is just an added locknut for the bolt.
It's nothing to do with part 61...these four studs have the reduced size plain and awkward hexagon nuts, part 106, but difficult to see from the diagram.
Swarfy.
Thanks Guys.
Well described.
I now understand what's going on, I will give it a go.
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I'm not up as early as you Roy (02.32 - or is it late to bed?) whichever *eek* but here is a picture of the inside of the outer cover. The red arrow points to the head of the bolt securing the spring to the inside of the cover and mentioned by John and Swarfy. It's head can just be made out in the photo and the yellow arrow points to the other end of the spring (made as a hook) that holds it onto the kickstart spindle.
(Edit) I will add that you can see the spring's tension being maintained by using the clutch operating arm to hold the kickstart pedal in place.
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I'm not up as early as you Roy (02.32 - or is it late to bed?) whichever *eek* but here is a picture of the inside of the outer cover. The red arrow points to the head of the bolt securing the spring to the inside of the cover and mentioned by John and Swarfy. It's head can just be made out in the photo and the yellow arrow points to the other end of the spring (made as a hook) that holds it onto the kickstart spindle.
(Edit) I will add that you can see the spring's tension being maintained by using the clutch operating arm to hold the kickstart pedal in place.
HA HA, I get up at 4-45am to take the dog for a walk and go to bed at 10pm.
Thanks for that Roger, it shows me a few things that I am contemplating doing.
I have a new clutch lever to go in, also my gear change is a bit sloppy, so thinking about fitting a new bush. The bushes that Draganfly are advertising look like they are made from steel not brass, will this be OK ?
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Hi Roy, I'm no engineer, but yes both the gear change and kickstart bushes are steel as nothing spins fast in them.
(Edit) Bear in mind there are steel bushes for gear change and kickstart spindles in the inner cover also (see photo of mine).