G'day. If the engine was running OK before it came to earth, the chances are that the adjustments are still pretty close to right. I would check that the carby is clean by flushing some fuel through it in both directions with the needle valve out (check where it is before removing) and with the throttle wide open. This should flush out any muck that is in there. I would leave the Low Speed Needle alone at this stage.

Then try again but with some fuel which you know is OK. Poor idling is often caused by fuel which is past its best. We had similar problems recently with a Saito 62 and some different fuel make it a different (and much happier) engine.

If this fails, then start trying to adjust things. Fuel is too often the problem when an engine just won't idle properly.

Hope this helps a bit.

Mike in Oz