Will a ohv run on diesel. I don't see why it wouldn't. Since I posted this topic I have been experiementing myself. I started with a friends riding mower. You see we have been thinking about this together for a while. The mower had a newer briggs and stratton 12 horse in it. he hadn't mowed the grass in a while so it was high. The mower had a little bit of gas in it so we started it up and mowed abought 10 minutes. We shut it off and pured some diesel in it, Hit the key and it came right to life. I was surprised it ran without playing with the jets alittle. It smoked a little and drove great. But we had to jet it alittle because it was sluggish when it came to mowing the tall grass. We adjusted it ounce and got it right, and it when to mowing with all the power that it had with gas. Plus it gave of a little bit of smoke, not a lot just when the going got real tuff. Mowed for a good three hour on diesel. And it smelled like diesel so that made that much better. When we were done, we let it cool and we learned that it has to be shut down on diesel. After that I went home and started my push mower up and warmed and put diesel in it. But the pusher has a carb on it that is not adjustable so it lost a little power. But I still kept a mowing. It never quit on me. As long as you don't have to mow tall grass it would be ok. And I couldn't stop myself after that. I got out my go-kart that has a 5 hp flat head briggs and stratton, ran it to it got warm and dumped some diesel in it. I adjusted the carberator a little and got it running good. Ran it for a good 45 minutes and filled it up again with diesel, and went out and gave it **** again. I ran it a good hour and a half and parked it in the garage because I had to be some where. The next day I had a little free time and was just in the shed my oil shrin and was just sitting ther with a friend. I thought let go out and ride the kart. And then I remembered that I left it last night with about a half quart of the big "D" in it. So I thought to my self lets just crank it over and see if the beast would come alive or fall flat on here face. I pull and it fired and belched ball of smoke and died. Tried it again but with a little throttle and it live a few second. After three or so tries it stayed running. It ran ruff for a minute or two and was a smoken son of a gun, but after it warmed up the smoke clear a great deal and it ran like it was a suckin the gas. Since then I try and shut it down on gas. If I can it I will live with the smoke at the next start. The go-kart was the end of my diesel bug till I get that engine finished that I mencend earlier in the posts.