ORIGINAL: bob27s

When Dub mentions "rich" in the break-in instructions, he has instructed that you have set needle valve initially at a very rich setting .... this to avoid any possibility of starting the engine lean. A Jett engine simply will not run blubbering rich (some other engines will) even with the glow plug driver on. It has to come up to a decent temperature and have a smooth mixture just to run stable. So by rich, he is stating that the engine is running, stable, with the glow driver on, clearly 'wet' sounding and clearly not peaked. This is, in most cases, a rich 2 cycle or just on a 4 cycle break.

For a brand new engine this is basically to allow the engine to warm up slowly so you don't toast it right off the bat. As noted, this is just for the first minute or so. In about the time it takes to lean the engine a bit so it stays running, put the starter back in the field box, and move so you are located behind the engine for subsequent adjustments, you have expended the appropriate amount of time.

Bob