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MkIII speedo drive #446575
07/28/12 10:41 pm
07/28/12 10:41 pm
Joined: May 2007
Posts: 208
Southeast Pa
V
vancer Offline OP
BritBike Forum member
vancer  Offline OP
BritBike Forum member
V

Joined: May 2007
Posts: 208
Southeast Pa
After a ride this morning I gave my 75 MkIII a check over and noticed some resistance when turning the rear wheel by hand. At first I assumed the brake pads were causing it (I have a Lockheed aftermarket kit on this bike) but after removal of the entire brake package the resistance remained.
I came to the conclusion that it is the speedo drive. I had to use heat with a gear puller to get the drive off of the stub axel.
Anyone with tips or experience with such an issue? Have never seen one of our beloved speedo drives so stuck. Wonder if I need to space it out a bit more? .


71 T100c
'75 Commando
'64 Jawa
'15 V Strom
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Re: MkIII speedo drive [Re: vancer] #446576
07/28/12 10:52 pm
07/28/12 10:52 pm
Joined: Mar 2006
Posts: 3,836
Norfolk, UK
L.A.B. Offline
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L.A.B.  Offline
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Joined: Mar 2006
Posts: 3,836
Norfolk, UK
Originally Posted by vancer
Anyone with tips or experience with such an issue? Have never seen one of our beloved speedo drives so stuck. Wonder if I need to space it out a bit more?.


Was there any evidence that showed the sprocket had been rubbing against the rear face of the drive?

If so, then the drive probably needs spacing out with an extra washer. I had to do that to my MkIII's drive box.

Re: MkIII speedo drive [Re: L.A.B.] #446578
07/28/12 11:04 pm
07/28/12 11:04 pm
Joined: May 2007
Posts: 208
Southeast Pa
V
vancer Offline OP
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vancer  Offline OP
BritBike Forum member
V

Joined: May 2007
Posts: 208
Southeast Pa
L.A.B. No no indication of rub there. Will have to give the unit a good clean and go from there I suppose.


71 T100c
'75 Commando
'64 Jawa
'15 V Strom
Re: MkIII speedo drive [Re: vancer] #447735
08/05/12 7:49 pm
08/05/12 7:49 pm
Joined: Sep 2007
Posts: 1,134
Ottawa, Canada
gREgg-K Offline

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gREgg-K  Offline

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Joined: Sep 2007
Posts: 1,134
Ottawa, Canada
Usually the gears in the drive will strip before there is enough friction to impede the wheel's rotation. I have also seen the drive dogs sheared right off the ring gear.

Time to get in there, remove it and sort out where the binding is coming from ... you may need a new speedo drive.

... Gregg


Spyder Integrated Technologies
Lucas, BTH, & Miller Magneto & Dynamo Restoration
SMITHS Chronometric Restoration
magneto@spyder-it.com

Moderated by  Dave Comeau 


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