Hi Isaac,
Have to be honest with you that I am a real beginner level compared to many others on this forum
. But will like to share some thoughts with you for sure.
I have brought my Bell 47 G to Asia earlier this year and hence will not be able to provide close up photos until my next visit.
I got my Bell 47G in an unflown conditions but far from the good conditions of your heli. few points to share:
-about the metal fly bar center piece, I would advise to check thoroughly and be easy at least first time fired up the engine, mine broken together with the one way bearing main shaft after first few times spooling up. A close inspection (i think) revealed that it is due to metallurgy ageing and/or fatigue issues? so, pelase be carefuly with that. Luckily a fellow flyer is kind enough to donate a spare one as Hirobo no longer carry this part.
-I am not sure about your engine but if it struggle to start up and keep running smoothly as mine did initially, a changeout of the carburetor diaphram and gasket kit will change the story! I changed all rubber parts in the carburetor (you can get gasket kit of your particular carburetor by searching online) because all the original ones become stiff (after 20+ years!) hence diaphram cannot pump in the petrol porperly.
-as you said that you are changing to 2.4GHz so that is good. I had really scary inteference with my original FM radio, the servos decided to do their own movements! spark plug in petrol engine can cause severe inteference to FM radio
- I am not sure about your 25CC engine but my and another fellow flyer with same engine concluded that these hirobo 20 cc engines are best when loaded up with high positive pitch on the main blades.
-I use futaba GY 401 as scale does not need latest gyros for 3D etc but still holding the head very very well. of course 3 axis gyro will be good !
-does your engine come with electronic ignition system? if so, here is a forum which Pete shared a lot of upgrading hirobo older's electronic ignition system.
http://www.rcheliaddict.co.uk/hirobo...tml#post886688
all i can think of for now. will post mroe if I can think of any more..
Cheers
Lawrence