All
I have searched the site and have found so many variations in volumes and viscosity i am confused 
Would appreciate recommendations. 
Thanks
Micky
The 565 cc volume figure that guzzisteve gives you is from page 55 of the "Jackal" Service manual. You can find the .pdf version of the manual on the "thisoldtractor" web site maintained by Greg Bender, if you don't already have a manual available to you.
Lannis