That Riverton address blew his cover long ago!
Nobody has mentioned the weight aspect of the weeder conversion from CH.The stock flywheel and coil,weigh close to a pound,and even adding back in the weight of the CH unit and a battery pack to bring it to life,I reckon the weight saving at around 10oz,important on engines this small,particularly in 1.20 sized models.The flywheel often gets in the way depending on the model involved.The CH "kit" comes with a very professional prop driver with the sensor magnet imbedded in it,and the only things left to buy for the conversion are a mount and muffler,although the stock muffler can be used and a mount is easily home made.
I never had much luck starting the Ryobi by hand until it was warmed up,due I assume to the anemic compression ratio,so I just use my standard Tower HD 12V starter.
I ran some static tests last nite,on a well broken in 31cc unit,87 octane,Honda synthetic 40/1 and got:16x8 wood 7600,16x8plastic 7800,18x8 plastic 7200.This was with the high end peaked with a tach and then backed off 1/8 turn.
I,m now going to install one of Frank Bowmans replacementcement rings,break it in as he recconends and test the same props again.I expect easier hand starts,a steadier idle,and maybe some more on the top end.I dont beleive in revving the guts out of Ryobis.They cost about .29 cents to make ,and take many quality shortcuts including that con rod that looks like a grenade going somewhere to explode!,so if I get more top end Ill use more prop......I wont argue with anyone who says the McCullogh or homelite are better weeders quality wise,but the Ryobi can be bought factory reprocessed for $60,is a neat fit in narrow cowls,and there are numerous places making parts or conversions for it.
Before anyone asks for my credentials,Ill tell you I have owned 4 Ryobis,done the conversions on three of those,use a CH ignition on the current one I am flying in a SIG 4/120,and Im not even close to the league RC IGN,and the boys from Riverton play in !