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You can find a manual for your Rally rear tine self perpelled Rototiller model RYX820K, manufactured by American Yard machines, on the American Yard machines website. You will find manuals for all of their products on the website.
MTD makes the Yard Machines mowers. You can find parts and manuals at www.mtdproducts.com
Change four thirds yard to feet?
Seems to be 6 hp.
Need. Picture of belt setup
One really solid option is the Lawn and Garden department at Sears. They have a large collection of cheap yard machines. If wanting even cheaper options your best bet is likely to look at offers from Amazon or eBay.
Special 2 stroke oil for yard machines they have at hardware stores in that section.
1 yard = 0.9144 metres
there were calves in my back yard.
you ran faster
27.777777 sq yds
divide by 9