I have an old (late '40's) tiller, a Roto-ette, I think is the brand. When I got it, the engine was pretty well shot and it had been sitting for years. I got a junk yard Briggs and installed it on the tiller and it runs fine. Not knowing any difference, I filled the differential with 80wt oil. Is there a better choice that I should be using?
Also, I need to consider changing the throttle control on the engine. It's got the adjustments on the engine and not set up for a cable. Probably can pick up a different setup from the mower shop (or another junk yard find???).