TREX 700 help please

[Si Goodchild]

Guys,

Two questions, please:

• I need to swap out the starter shaft on my 700 after snapping it at the coupling end. I think the easiest way to drop it out is to remove the undercarriage, carbon base plate and engine+fan shroud. The shaft should just drop out then, yes? Then refit is the opposite of removal. Any better ideas?
• Any tips on tuning the OS 91 HZ Pumped engine? I don't want to run too lean, but don't want to waste fuel or have sub-optimal power either. Clearly I can#t feel the baseplate (the pump is in the way) so is there any good advice to get the last bit of tuning right?

many thanks,

Si G

[GravityKills]

you should be able to take the clutch assembly out through the top side of the frame. At least I think I remember having done this, without removing the engine.

I'm happily wasting fuel but I fly YS :-)
I think the proper way would be to check the temperature of the cylinderhead. At least on the .50, the baseplate temperature is a rough indication at best

[Rotorhead]

When setting up the OS91HZ-PS just set the main needle to about 2.5 turns open and then lean it off as necessary, mine ended up about 1.5 turns out after running in.

Initially I set the mid range needle to about 0.5 turns, mine stayed there, but the mid range needle doesnt have to be open at all, fully closed the carb is essentially a normal high/idle adjustment carb, just so you know, the mid range needle does not need to be very far open, 0.5 seems slighty rich, but I would rather run an engine slightly on the rich side anyway just to protect it.

[Si Goodchild]

Thanks, guys.

I reckon the clutch will come out via the top of the frame if I drop the maingear off first. I'll let you know how it goes.

Si G

[Tim Procter]

I reckon the clutch will come out via the top of the frame if I drop the maingear off first.

It does.

I did mine about 4 weeks ago.

[Si Goodchild]

Top man, thanks.