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0| Helijunki
rrNovice Brecon Powys UK |
OS 70 running issuses Hi all.
I am running an OS 70sz in my Raptor 60 and after a rebuild, it is running really hot.I have replaced the following after the con rod broke up during a fly. New piston and ring, con rod, piston pin, seals, glow plug (os8) and new bearings. I set the idle, mid and high range needle back to factory settings. Once all fitted back into the heli I put some fuel through the top of the head and turned the motor over with an allen key by hand a few times. Once all seemed ok,I started her up and let it idle for approx 1 min or so, all looking good. Took it out to the field and popped her up in the air showing a nice amount of smoke but after a couple of minutes of hovering, the motor very slowly started to slow down so I landed. The first thing I noticed was that the motor was really hot, I mean so hot I couldn't keep my thumb on the back plate for more than a second. I tried to richen up the mix separately using the all three screws, but only managed to get it stall at half and 3/4 throttle. There is one thing I forgot to mention is, the fuel I am using is Optifuel 20% but it is one year old. I don't know if that makes any difference but I have just ordered some more 12% as I only pootle around.I would be really grateful if you could help me out with this one.ThanksDave |
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| flycatch
rrApprentice Barstow, California |
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 JuanRodriguez
rrProfessor The Villages, Florida 💎Sustaining Member |
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| Blue Angel
rrApprentice Redford, Mi - USA |
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| Helijunki
rrNovice Brecon Powys UK |
Flycatch, Thanks for the link. I have done some reading and this also refers to an air leak so I have been renewing all the fuel lines and checking for any damage to the tanks.Juan, I have just stripped the carb and I did find the piece of sleeve that the mid range needle screws into (excuse my terminology) was pretty much completely blocked, so I give it a good clear out with some solvent cleaner and it opened it right out. That couldn't of helped much I think?As for the exhaust, I only used an aluminium gasket without any compound sealant of any kind. Would this be enough to give an air tight seal here?Blue Angel, Sorry , Is the sleeve the piece that the needle screw into?Thanks again to you all.Dave |
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| realfastrc
rrNovice baltimore md |
rtv What ever you do don't use that metal gasket over again... |
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| JuanRodriguez
rrProfessor The Villages, Florida 💎Sustaining Member |
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| Blue Angel
rrApprentice Redford, Mi - USA |
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