Mk3 crankshaft
- Thread starter Edupantxi
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The Mk3 crankshaft is wider between the cases and the drive-side shaft is longer due to the electric start sprag assembly so maybe not impossible to fit a Mk2A (or any other pre-Mk3) crank into Mk3 850 cases but it wouldn't be a straight swap and the Mk3 electric starter obviously couldn't be used.
Maybe a difference in timing-side shafts as well (because the Mk3 crank and intermediate gears are thinner) but I'm not sure about that.
Maybe a difference in timing-side shafts as well (because the Mk3 crank and intermediate gears are thinner) but I'm not sure about that.
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I'm not going anywhere near this question . Good luck .
Fast Eddie
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I assume the extra thickness is in the cheeks?
Is it in both, or just one?
How much wider is it?
Why was this done, did it address a known failure mode?
I’m just curious here …
Is it in both, or just one?
How much wider is it?
Why was this done, did it address a known failure mode?
I’m just curious here …
- Joined
- Nov 20, 2004
- Messages
- 20,124
Both apparently.
750 vs 850 Commando Crankshaft
Does anyone know the difference between the 1971 - 1972 750 & 1973-1974 850 Crankshafts ? Can the 750 crankshaft be used in 1973 850 cases without problem ? Another question is, Why does the 1972 Combat engine have the extra Tabbed Thrust Washer on the Camshaft ? Thanks in anticipation...
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Mk3 changes from 74 models
I read somewhere that the MK3 has over one hundred changes from the previous model, but have never found a listing of these changes. Is there a publication which details the items? Glen
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I don't recall any actual crank dimensions having been quoted for either, only the crank and intermediate gear widths (I'm searching for the Mk3 intermediate gear width but probably thinner by a similar amount).
Commando parts jumble build thread!
Now we are cooking. Frame has been stripped and painted (underneath my tree in the back yard), and gearbox is going together thanks to Ron L and Bwolfie. Spent the better part of the weekend painting the frame and assembling my new sandblasting cabinet. Here's a view of my hellhole...
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I don't know.