I just got a Iron Bay Regulator for my Saito 125, the manual just calls for you too richen the HSN 2 turns out than normal. Then you can go ahead and tune as normal. So I did my normal tuning procedures, I leaned HSN until I reached peak RPM then richened until I dropped about 800 RPM. Flying around at about half throttle I have a nice steady smoke stream from the exhaust but as soon as I open to full throttle the smoke disappears. Does this mean anything??

It might mean the LSN is set to rich.

If the engine runs good and has good power I wouldn't worry about it

Did you ever adjust your low speed mixture as Charlie has mentioned?

Charles?? Gray Beard?

I didn't think the LSN would have any effect on anything besides idle.

It could cause the smoke you see at the lower speeds

On the ground and at a low idle (while secured), what happens when you go to full power quickly... cough, burble, excess smoke or die?

Does it go to full power instantly with no 'ramp-up' in speed??

Again on the ground From full power to idle, when AFTER the stick is brought to idle will the engine speed be the same or slowly sag???

This is the test you should use. Smoke from idle is usually common in the air.

This is the test you should use. Smoke from idle is usually common in the air.[quote]ORIGINAL: FILE IFR