I'm having a devil of a time setting the high speed needle valve on a used Zenoah G-38 that I got from a friend. The engine has not been smacked but the carburetor sedttings have been messed with. The instruction manual call for
0~1/4 turn for the high end and 1-1/4 rotation for the low end. The low end idle seems about right but is that a typo in the manual for the high end? All the experts in the club said that I should start at 2 turns open for the high end but this seems extremely rich even though the engine started fairly easily when I started it there. The 0-1/4 turn would seem way too lean. I'm using a Zinger 18/ 6-10 prop which seems to be adequate power for for this engine. My only other experience with the larger gas engines is with a Fox (Sachs) 41cc engine which has run fabulously out of the box with no fiddling with the needle valves. So any suggestions are welcome at this point before all my brown hair turns gray. Joe L.- posted
19 years ago