Author Topic: Crank I.D.  (Read 288 times)

Offline BritTwit

  • A's Good Friend
  • ***
  • Join Date: Apr 2017
  • Posts: 110
  • Karma: 2
Crank I.D.
« on: 28.02. 2020 19:16 »
I've had both of these for several years.  They were both marked as A10.  Now that I'm ready to use them, there appears to be a difference in the drive side.
What's what?
[/img]

Online muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8914
  • Karma: 113
  • Lithgow NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: Crank I.D.
« Reply #1 on: 28.02. 2020 19:39 »
G'day BT.
The one on the left is either an A10 alternator model or an A50/65. Measure the drive side journal. I think the A50/65 is smaller.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline BritTwit

  • A's Good Friend
  • ***
  • Join Date: Apr 2017
  • Posts: 110
  • Karma: 2
Re: Crank I.D.
« Reply #2 on: 28.02. 2020 23:05 »
Thanks Muskrat
It appears I have an A50/A65 crank (smaller bearing I.D.) .  I thought maybe the odd one was an alternator A10, but they are rare in the U.S.

Offline Nourish

  • A's Good Friend
  • ***
  • Join Date: Aug 2013
  • Posts: 124
  • Karma: 0
Re: Crank I.D.
« Reply #3 on: 29.02. 2020 09:31 »
Interesting - Will a unit crank fit into the pre unit cases - by just putting a bush over the smaller diameters?

Online JulianS

  • 1962 A10
  • Wise & Enlightened
  • *
  • Join Date: Mar 2017
  • Posts: 1163
  • Karma: 22
Re: Crank I.D.
« Reply #4 on: 29.02. 2020 10:04 »
If it would I think some work would be needed.

The A65 gearside journal is a nominal 1.5 inch diameter and the A10 less at a nominal 1.375 inch diameter.

The A65 cranks early v late type have different widths, interesting article here;

https://www.classicbritishspares.com/blogs/news/early-vs-late-cranks

Online Klaus

  • Valued Contributor
  • ****
  • Join Date: Jun 2015
  • Posts: 402
  • Karma: 10
Re: Crank I.D.
« Reply #5 on: 29.02. 2020 11:51 »
A65 has 10mm shorter strocke, so its better to build up an A7 with it.

chers Klaus


If you think, everything is under control, you are not fast enought.