This engine is not like any other glow motor. It is the lemon of the OS line up and has been since the day it came out. I returned two of them within a month about 3-4 years ago. It 's not worth wasting your time with.
ORIGINAL: Taildrager
this engine is like any other glow motor, peak the Hi then richen 300rpm, them set low for best transition and idle. If it still won't run correctly something else is wrong. Have you up dated with the new remote needle valve OS is selling? This is a strong engine if set up correctly.