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Engines and Mufflers Having problems or need advice on Engines or Mufflers? |
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09-05-2016, 03:02 PM | #1 (permalink) |
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Join Date: Feb 2012
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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. Thanks Dave |
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