Anyone who thinks MOST, not ALL, gassers made here in the US of A had pistons and cylinders designed and manufactured to their own tighter(?) specs for aircraft still believes in the tooth fairy...
Manufacturers want us to think they're unique..How about some of the major manufactureres telling us where the parts REALLY come from ?????
Echo, Stihl, Sachs/makita, and Husqvarna..Most 2.4, 3.2, 4.2, 5.8 singles are Sachs parts..Most 4.8 twins are 2.4 Sachs parts, 6.4 twins are Sachs parts, 8.8 twins are Husky parts..11.6 twins are Sachs parts...Quadra Aerrow parts come from Partner/Pioneer/Poulan...Zenoah ? Red Max lawn and garden equipment...U S Engines? formerly chainsaws...
99% use Walbro or Tillotson carbs..I can tell who the carb was made for (manufacturer and model number) by the part number stamped or cast into the carb.....Walbro WILL customize a carb and make it proprietary if any manufacturer would buy enough to make it worthwhile..Most companies use the carb made for the original application..Witness the WT76A made for the 3.2 Sachs...4.2 and 5.8 engines use SDC 80 carbs..You can call Luis Salas at Walbro for info...They do it for Stihl chainsaws ....
How about it guys.. A Little truth in advertising ??
FWIW..Nikasil as used by 3W and some others is harder and smoother than hard chrome....