Sorry Dan, they don't use a glow plug, they ARE compression ignition but do use a carb. They are fuelled with paraffin (kerosene), oil and ether mix; the ether permits compression ignition at a lower CR than a 'real' Diesel engine. Martin.
Try Yanmar (famous for single cylinder sailboat power) or Lombardini (builds a way cool itsy-bitsy 4 cylinder turbodiesel that's popular on portable sawmills). Mitsubishi used to build a 17 hp two cylinder that Toro used on the
217-D mower. It's out of production. Kubota (Brigg & Stratton/Kubota) builds a variety of turbo and normally aspirated 3 cylinder diesels for turf equipment- from 25 to
35 hp. There are several single cylinder Chinese engines (both air and liquid cooled) that are Yanmar knockoffs. They are actually quite reliable.
Rightly famous too - those things run and run and run...
My Yanmar anecdote:
For about 16 years I crewed on a 28' racing sailboat. The winter before I started the owners had removed their 7HP single cylinder Yanmar and replaced it with an air cooled gas engine because the gas engine was lighter. (80 lbs vs. 300) They more or less abandoned the Yanmar on the loading dock in the unheated truckwell where they stored the boat.
The new engine was a piece of crap that constantly overheated, and the weight savings made little or no difference in sailing speed. So the next winter they decided to re-install the Yanmar. I was there to help. We were looking at the engine (still sitting on a couple 4x4s in the truckwell). One of the owners was explaining things to me - "if the battery dies, you can pull that compression release there and crank here to start it".
I said "like this?" and gave it a crank. We were both shocked when it started and ran! No electrical, fuel, or cooling water connections - it was running on old fuel trapped in the filter bowl. It had been at least 15 months since the last time it ran. I don't know how long it would have run on the trapped fuel - we shut it down quick since it was puffing black diesel smoke into the room (and had no cooling water).
That engine ran the boat for the next 16 or so years. It eventually needed some work - the owners _never_ changed the oil. Never used fuel stabilizer either. We raced twice a week all summer, probably an hour of run time each race (half hour before, half hour after). We often were able to go nearly all season on one 12 gallon tank of fuel. Whatever was left in the fall is what we started with in the spring.
We managed to start it backwards once - didn't crank it hard enough to get over top dead center, but it ignited the fuel anyway and away she went - exhaust coming out the air intake. I guess we were lucky it didn't suck enough water from the muffler to hydro-lock it.
Back in the early '60s my former editor at American Machinist, Andy Ashburn, started his series of trips to Japan to see what was happening there. One place he stopped on an early trip was Yanmar, which no one in the US had heard of. He was very impressed, and said that the company, which was just a little operation then, was one to watch. He said that someday they'd make some of the best diesels in the world.