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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Hyper problem
03-03-2008 06:24 AM  10 years agoPost 1
Helijockey

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150 miles from somewhere

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I had just over 100 flights on my trex with the OS50 Hyper. Although the engine was not giving any problems I decided to change the bearings. I did 3 flights after installing the new bearings and all was ok. Today I went to the field again and the engine wouldn't start I checked the plug which was ok but still I changed it and tried again, still no luck. I then asked my buddy to give a bit of throttle while I started the engine. The engine then started but as soon as I reduced throttle it quit! I checked the fuel lines, fuel tank, filter etc and they all seem alright. I tried again with the same results! This has been by far the best hyper I have owned so far but I just can't figure out what the problem is. I'd appreciate if u guys can give ur opinion.

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03-03-2008 08:19 AM  10 years agoPost 2
Jambo

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Kent, UK

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Has any foreign objects got in the carb whilst you was working on it? Might be worth flushing the carb out with fuel, etc. I’m assuming you put a nice new glow plug in it.

I just replaced my Hyper due it being warn out and it took quite an unusal amount of throttle to get it to stay running until it had been running for 5 mins, it just did not want to tick over. I think it was just very tight.

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03-03-2008 11:46 AM  10 years agoPost 3
airdodger

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Johnston USA

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I would guess if you did not fool with anything else the bearing is the problem. The bearing may not be seated or could be slightly off center, did you spin the crank by hand after install to see if it spun freely? Sometimes you may have to install the bearing multiple times to get the alignment spot on. The bearing may be difference clearance or damaged.

Chris

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03-03-2008 12:20 PM  10 years agoPost 4
Helijockey

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150 miles from somewhere

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I just sent the engine to a friend at the LHS he'll get back to me later today. Infact he was with me when I replaced the bearings and since he has a good knowledge of engines I asked him to take a look. Also I noticed when starting the engine the compression was not as much as it normally is. The strange thing is yesterday the engine was perfect for those three flights

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03-04-2008 12:05 AM  10 years agoPost 5
Jeff polisena

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westpalmbeachflorida usa

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Sound like ring cracked sometimes when you put ring and sleeve back in case after replacing bearings ring catches port on sleeve and cracks it will run until ring spreads apart at crack and looses compression

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03-05-2008 04:18 PM  10 years agoPost 6
Helijockey

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150 miles from somewhere

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My buddy at the LHS says he cleaned the carb and now it's running fine I guess I just overlooked the carb Also thecompression is ok as well although at the time I felt it wasn't. When things are not going well one tends to think all sorts of stuff I guess Anyway thanks for ur posts guys

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03-06-2008 05:27 PM  10 years agoPost 7
Jambo

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Kent, UK

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Great to hear you found the problem

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