Not hardly a soul doing anything with the EA-81 any more. Here are the rules to make the EA-81 a good choice. Pilot wt 180, [less is better]. Empty weight 350, [less is better]. Prop, Warp 60" set at 6* on tips. Prop RPM 2600 climb, 2200 cruse. Rotor, 24" Rotordyne or Skywheels or Extruded [[8 H -12] rotor. No other rotor I have tried will give good climb. The secret to marginal power is a good rotor. Stock carb and manifold, holly 1920, or Pinto holly 2 barrel progressive work okay. I like the Pre 1980 1700 cc point dist. for ignition, stock elec. ign do not hot spark enough for hand prop. [Con't below].

In thousands of hours on my own 3 engines, only a .67 cent expansion freeze out plug one time has been my only expense. Near 30 intallations over the last 20+ years, with a 2 year guarantee, never had to replace anything for all those men. A most perfect engine has never been, till the 912, but that baby is above our pay grade. No prop hubs left anywhere. Herman said he got Ora's last one...

Thanks Tony, for getting us started with the EA-81 back in the late 80's.
With your prop hub, 1920 Holly Adapter, Milled beautiful housing cover, etc.
Still have 7 housing covers yet. Sold one last month. Have 5 engs. left too.