Hi guys, I've got some questions about the ryobi 25cc 4 stroker.
Anybody using it to pull an airplane? If so what kind? What sort of mount are you using?
I just got a brand new one and am looking at how I want to go about skinning and mounting it and what sort of bird it will pull, etc.
It doesn't look like it would be happy inverted at all, maybe the occasional loop if it has the power. I think it might be happy in a big old air camper or such, just putting around. Anyway, at this point I've got a carrot and I'm still looking for the horse
Any info or ideas welcome
Jim

It is a good engine, no doubt. Check with carrprecision and they sell the conversion parts, I think BCMA and whackermotors do the same engine but I don't recall off the top of my head, point being they are available. I am a big fan of the Rascal 110, that would be a nice match for that motor if you want a nice ARF. For kits, the 1/4 scale D VII from Balsa USA would be an OK match for that engine. You won't have insane power but for putting around the sky in a scale manner, you would be grinning ear to ear. It has been flown on the Honda GX35, Briggs and Stratton 34 and I think a GX31 too.

I've got a Ryobi 4 stroke that's in the process of being converted ( just started the conversion). First thing I'd do is give the stock carb a fling in the trash can and put on a two needle Walbro. The one I'm using is a W 1123. It came off by IDC 31cc 2 stroke weed eater and it bolts right up to the manifold. I had to richen up the needle settings from what the weedeater had, but other than that it ran fine. And yes it'll pull fuel with the stock pulse port on the manifold. I haven't run it on a test stand with a prop as I am in the process of figuring out how I need to mount the engine. As a FYI, I first used this carb on a Briggs & Stratton 34cc 4 stroke and it turns a APC 18x6W prop in the high 8000 rpm range on a test stand. I did remove the stock muffler and am running a straight pipe ( sounds too cool ! ) to get that kind of rpm. Also please note that I'm at 3500' MSL which may attribute to the higher rpm. Good Luck on your conversion.

Greg