Need help?


Search OutdoorKing-Forum by entering Key Words Below



Who's Online Now
2 members (Ghost, niggz), 941 guests, and 1,043 robots.
Key: Admin, Global Mod, Mod
Online Spare Parts


Online Store


Newest Topics
Decompression Valve carby connection
by Ghost - 25/10/25 07:11 AM
Victa 24 engine pulleys
by NormK - 19/10/25 08:49 PM
Rover Rancher 1766 headlight lens
by mm-mowers - 17/10/25 05:25 PM
Re rotomo crankshaft.
by Mops Mowers - 11/10/25 07:49 AM
Rotomo crank shaft
by Mops Mowers - 09/10/25 06:07 PM
Oregon corded chain saw
by NormK - 05/10/25 11:12 AM
Topic Replies
Decompression Valve carby connection
by Ghost - 25/10/25 07:11 AM
Rover Rancher 1766 headlight lens
by mm-mowers - 23/10/25 06:03 PM
Victa 24 engine pulleys
by NormK - 22/10/25 09:06 PM
The Rover Pro-Cut Chronicles
by DFB - 19/10/25 09:36 PM
Re rotomo crankshaft.
by Mops Mowers - 12/10/25 08:32 PM
Morrison Rapier 710 Advice Please!!
by maxwestern - 12/10/25 07:35 PM
Rotomo crank shaft
by Mops Mowers - 10/10/25 10:16 PM
Victa 5/26 Pulley configuration
by maxwestern - 10/10/25 07:42 PM
Previous Thread
Next Thread
Print Thread
Rate Thread
Hop To
Joined: Nov 2013
Posts: 6,938
Likes: 304
Forum Historian
Hello ODK history lovers

The small Cooper air-cooled 4-stroke engines were licensed copies
of the North American Johnson Iron Horse. Cooper Engineering –
owned by the giant Sunbeam Corporation – would make a few models
under licence in Australia.

The designs of these small ‘sloper’ engines date to the 1930s,
when the Johnson Outboard Motor Company,

[Linked Image]

In Australia, production probably began during WWII, when small
engines were needed to power military generators and water
pumps, and the like.

Post War, these Cooper engines formed part of the Cooper range
of industrial engines, and were mainly used on agricultural machinery,
but some AUS mower makers did use them. These makers include
the Grasshopper reel mower. The Marino Mowall, and the Cooper
Rotary Slasher.

TO BE CONTINUED …

Attachments
1950s_platypus.jpg (258.75 KB, 60 downloads)
1950s_mowall.JPG (141.22 KB, 59 downloads)
1950s_cooper.jpg (73.61 KB, 60 downloads)
Portal Box 6
Joined: Nov 2013
Posts: 6,938
Likes: 304
Forum Historian
PART TWO – Operator Manual
This manual is from my collection and it is mostly in good condition.
It is beautifully illustrated and of ‘the old school’ … of covering use,
maintenance and parts.

This was a time when makers took pride in giving their customers
comprehensive information.

I have divided this manual into two parts: - Use and Maintenance,
and then the Parts section. Here I provide a copy of the first part.

As always, I provide a quality scan available to members for personal use.

[Linked Image]
[Linked Image]

Attachments
cooper_manual_rv_pt_01.pdf (5.82 MB, 16 downloads)
COOPER MANUAL RV & PT 4-CYCLE PART 01
Joined: Nov 2013
Posts: 6,938
Likes: 304
Forum Historian
PART THREE – Parts Manual
I have divided this manual into two parts: - Use and Maintenance,
and then the Parts section. Here I provide a copy of the second part.

As always, I provide a quality scan available to members for personal use.
Here is the parts section: -

[Linked Image]
[Linked Image]

Attachments
cooper_manual_rv_pt_02.pdf (4.74 MB, 11 downloads)
COOPER MANUAL RV & PT - PARTS
Joined: Nov 2013
Posts: 6,938
Likes: 304
Forum Historian
[Linked Image]

The Cooper Rotary Slasher: -
https://www.outdoorking-forum.com.au/forum/u...per-rotary-slasher-c1954.html#Post100320

[Linked Image]
Would you like to comment?
Simply create a new topic in The Old Soap Box HERE.


Moderated by  Alan M, CyberJack, Mr Davis 

Link Copied to Clipboard
Forum Donation
These Outdoorking Forums have helped Thousands of people in finding answers to their equipment questions.

If you have received help, please consider making a donation to support the on-going running cost of these forums.

October
M T W T F S S
1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Newest Members
Mikey.Menace, Maudebs, Greenarrow01, stkarl, Stannyboy
17,641 Registered Users
Forum Statistics
Forums145
Topics13,010
Posts106,973
Members17,641
Most Online16,069
Sep 19th, 2025
OutdoorKing Showcase
20 Bucks from FB Marketplace
20 Bucks from FB Marketplace
by Return Rider, February 20
Victa Cortina 2 Shed Find
Victa Cortina 2 Shed Find
by Return Rider, January 25
My Rover Baron 45
My Rover Baron 45
by Maxwell_Rover_Baron, April 16
SHOWCASE - Precision Mowers - 2021
SHOWCASE - Precision Mowers - 2021
by CyberJack, April 14
SHOWCASE – Atco Rotary – Paul C - 2020
HOME |CONTACT US
Powered by UBB.threads™ PHP Forum Software 8.0.0
(Release build 20240826)
Responsive Width:

PHP: 8.3.26 Page Time: 0.039s Queries: 26 (0.033s) Memory: 0.6366 MB (Peak: 0.6795 MB) Data Comp: Zlib Server Time: 2025-10-24 20:53:28 UTC
Valid HTML 5 and Valid CSS