Managed to get this 47 Heli motor running and it will idle OK and transition fine ...generally. Still seems to have a problem though if left to idle for maybe more than a minute. When you open the throttle quickly, or slowly in fact, it bogs and stumbles and dies. If the glow igniter is still attached it might keep going long enough to pick up then it's fine again and will rev up and down crisply. Lot of smoke whilst it's picking up from prolonged idle so I think it's too rich at idle even though I've leaned the LSN to the point if you go much leaner it stops from lack of fuel (you need to re prime to get it going again). I'm also not convinced the HSN is entirely doing it's thing, seems a little unresponsive. The engine does slow if you richen it but it's not that obvious a transition as I remember on other engines I've run. Possibly also running a bit hot. Also the needle is set at 2.25 turns out whilst the manual states 1.5 turns to start so you'd imagine it should be turned in from there. The LSN ended up at 4.25 turns out which means the tip of the needle is obstructing the spraybar outlet hole somewhat at WOT which may not be a problem if the taper is correct I guess ... if it's correct.

Having said all that this engine was never really run in so maybe that's all it needs. The "manual" says it only requires 15 to 30 minutes of running with no special method which it's possibly had intermittently although perhaps not so much at full power which might be what is required to ultimately make it more reliable.

And all this on 14 year old fuel. Almost tempted to buy some fresh stuff !