ORIGINAL: cu. in.
It looks like you made several changes to your Ryobi:
1. Glow plug/adapter
2. Removed flywheel
3. New mount
4. New muffler
5. New prop shaft.
6. Other?
I would guess that your Ryobi weighs somewhere between 3.5 to 4.0 lb. without prop or spinner? Do you have an aircraft for it yet?
Thanks,
Bruce
Hey!!! That's
my Ryobi 31cc.
That was a single-ring Ryobi (older version) - my very first conversion engine! In that pic, I've got it set up on glow fuel (90/5/5 methanol/castor/nitro). Attached is another pic showing what was on the other end of the test bench sawhorse. Ahh... brings back some hair flapping, smoke blowing, ear deafening, neighbor complainin' memories...
Prop hub and glow plug adapter are from CH ignitions. Motor Mount and (not visible) carb adapter plate are from Carr Precision. B&B Muffler. I've had it running with up to 15% nitro and 10% oil (it makes more power with more oil, probably better combustion seal) and I remember it ripped the crap out of the 18x8 MA compared to an OS 1.60FX. Not bad for an engine package that barely cracked $100. Weight was right at 3lbs IIRC. Ended up selling that engine on RCU.
Later I did buy another Ryobi 31cc - actually a Bloens curve shaft trimmer - this time a twin-ring new version, when Lowes had it on sale for $49.95 brand new a few Xmas back. It was one of the last batch of 31cc with separate bolt-on flywheel guard. It is a classic by now. I won't be parting with it any time soon and will be saving it for a project where only a slim profile engine like the Ryobi will do.