With the glow plug in and the engine running, if possible the engine up to temperature. Mines is blowing a couple of very small bubbles around the plug, also the engine idle drops when I spray it with nitro cleaner. I have a defiantly have a leak around the plug.
As you can see in the video it idles fine but I never caught on video when it starts going rich and lean.
I am using the factory settings as a base, but I started leaning both hsn and lsn needles out a tad.
Lsn - flush with the side of the carb
Hsn - 2 turns out from closed
I am going to replace the head button, but I also think my carb has issues.
What fuel and plug are you using?
Cheers