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speedo drive probs
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jimmymac
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April 1, 2012 - 10:06 pm
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Hi all i seem to have sorted carb probs out
but now the rear wheel how tight do we have to tighten the nut that secures the speedo drive ???confused
i have put the spacer in and the drive is in place and turns freely when off bike i have tightend it up so that the drive stays in place and wont spin with the wheel but then the wheel seems to tight and wont spin by handconfusedif i slacken off nut then speedo drive also spins with the wheelconfusedany advise please cos i need to get it MOT

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DoubleDiamond
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April 1, 2012 - 10:39 pm
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I suspect that you need to have a look at the spacer again.  This should hold the speedo drive off the wheel so that when it is all tightened, the spacer is compressed between the wheel bearing and the flat face of the speedo drive.  Have a look at a parts book and that description should make sense: there is a diagram in the Haynes manual too.

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jimmymac
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April 1, 2012 - 10:46 pm
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Hi DD
i have looked at the spacer and untill i put wheel back insitue all seems fine if i hold drive in hand in vise it stays in place how tight sud i tighten the nut ??
cos when its real tight it restircts the wheel movement

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jimmymac
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April 1, 2012 - 10:50 pm
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looked in the parts manual and the haynes manual and have put it as it states

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Anderzander
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April 1, 2012 - 10:54 pm
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Which is what Jimmy ?  My D7 rear wheel is behaving the same.

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jimmymac
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April 1, 2012 - 10:58 pm
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wheel is ok and turns freelly with out speedo drive but put drive on and it restricts the wheel like i have tighten it up 2much
is the spacer just like a fat washer about 1/2inch thick???

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DoubleDiamond
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April 1, 2012 - 11:28 pm
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You have got the speedo drive dogs engaged in the wheel hub?  As for tightness, you should be able to do it up tight so that the speedo drive mechanism 'locks' to the wheel spindle: but you should still be able to rotate the wheel on the spindle. 

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David Dale
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April 2, 2012 - 12:56 am
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there is a small washer too, don't forget, perhaps the spacer isn't thick enough, it's nearer 3/4 ers than half an inch?

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jimmymac
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April 2, 2012 - 8:40 am
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thanks folks for the info will try it all again later today will try and get some photos on here
the drive is locked into the hub and the other washer is in place still confused

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Anderzander
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April 2, 2012 - 9:24 am
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I wonder if it needs a washer on the inside of the drive? If the spacer isn't wide enough the perhaps it's not touching the inside rim of the drive, meaning there is no contact through to to the centre of the bearing ?

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David Dale
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April 2, 2012 - 9:48 am
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Forgot to say that I always get the outside nut on the speedo drive pretty good and tight, which doesn't affect the bearings at all, you should be only tightening the drive to the spacer and bearing I think, not to the wheel hub, or it would in that case, bind and affect the whole set up.

I'm beginning to remember a similar problem with one of my first Bantams, I think that the spacer was too short and as you are saying it either seized everything up or anchor plate kept trying to rotate with wheel if I remember correctly. I also seem to remember dimly I admit, that there was more than one different thickness of spacer too. Could you find some appropriate washers and try to pack the spacer out a bit more, a washer or two at a time? I think that this is your problem, David.

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jimmymac
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April 2, 2012 - 3:14 pm
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thanks for all your advise guys i have got hold of another spacer from another bantam owner and have made some copies and all seems well no even speedo works got it up to 30mph on the axle stands LOLclap

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jimmymac
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April 2, 2012 - 3:15 pm
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I now have a few spare speedo spaces available if anyone needs 1

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Anderzander
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April 2, 2012 - 4:39 pm
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I'll let you know ! See how I get on with mine.

Do you have a spacer on the outside?

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