RE: sts questions
On my STS D21B when cold I had to loosen the glow plug to start it up till over 3 gallons on my 12-volt Ofna chrome top starter box. I have 4 STS engines and they did not wake up well till all most 1-½ gallons. If you are running only 190 it is running to cold. Yes lean it out some more and tune for performance. Let us know how it goes and what you think of the engine. Are you running the standard or turbo plug?