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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS 37 sudden loss of power.
10-27-2006 06:35 PM  12 years agoPost 1
COOKIEULT70

rrApprentice

CAMERON PARK, CA

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Ok, its a Hawk Pro, Hitori pipe, and a 2 month old OS 37 with about 2.5 gallons through it. I was doing a slow climb out and the tone of the motor changed and slowly lost power but stayed running. I landed and checked the backplate and it was a little warm. I could only keep my finger on the backplate for about 2-3 seconds. I have richened it up a little and it runs cooler now but It doesn't habe the RPM or power it used to. I had to move my throttle curve up by more than 20% and still it doesn't have the power. But at least it flies. Has anyone heard of the Hitori pipe comming apart internally? What should I check for? Please help.

GAHH!!! Someone call 911!! My wallet is bleading heli parts!!

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10-27-2006 09:05 PM  12 years agoPost 2
Luis104

rrApprentice

Caracas / Venezuela

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1 check ALL the fuel lines (specially the one inside the fuel tank and the header tank)
2 check the carburetor for any possible obstruction or dirt inside it
3 change the glow plug.
4 check the pipe/engine seal (the engine might be loosing preasure between these parts)

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10-28-2006 03:31 AM  12 years agoPost 3
turboomni

rrProfessor

East of the Equator

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Might check/tighten head bolts and backplate bolts ,especially if you didn't check them when you installed it. Check the carb for a good seal too and make sure it is fully seated in the bore. Clean out carb. Anything that can be tightened check ,muffler carb engine. Loose head will cause I believe a potenial to loose power of course, and overheat the motor and possibly destroy it. + what was already mentioned too by Luis.

Setup is everything, All my heli's can fly far better than I can pilot them

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10-28-2006 04:35 AM  12 years agoPost 4
COOKIEULT70

rrApprentice

CAMERON PARK, CA

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Ok, I removed the motor an took it apart. The back of the sleeve and the piston have some scoring. Right in line with the teflon piston pin button. What gives? Is this what happens when you run a motor too lean? Should I send it in for warranty?

So I richened the HS needle about 6 clicks. It still runs. Maybe it will break itself back in and start running better. Probably not I know.

I guess its time for the OS 46 conversion. I'll just fly it like it is with the 37 untill I get the new motor and send the 37 motor in then.

GAHH!!! Someone call 911!! My wallet is bleading heli parts!!

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10-30-2006 05:29 PM  12 years agoPost 5
Luis104

rrApprentice

Caracas / Venezuela

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the scoring you a talking it´s burned castor oil. what fuel did you use...??? I damaged a motor just for cleaning the burned castor oil inside the engine. now I only use Cool power fuel 99% syntetic oil and about 1% of castor oil. (if I´m not wrong)

yust an advice: you always need to pay atention to the engine sound and the engine temp. If it´s running lean the engine begins to sound louder and without smoke. The lubrication it´s extremley important in all engines; remember it´s allways best to fly a little bit rich than lean.

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10-30-2006 06:24 PM  12 years agoPost 6
COOKIEULT70

rrApprentice

CAMERON PARK, CA

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I'm using Wildcat 30% Curtis Youngblood. 23% synthetic oil.

GAHH!!! Someone call 911!! My wallet is bleading heli parts!!

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10-30-2006 10:40 PM  12 years agoPost 7
Gary Jenkins

rrElite Veteran

Nowhere, US

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The scoring is from running to lean and the lack of lubricant allowed metal to metal contact.

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11-09-2006 02:57 AM  12 years agoPost 8
COOKIEULT70

rrApprentice

CAMERON PARK, CA

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I sent the motor in today to hobby services. I will post the results when I hear back from them.

GAHH!!! Someone call 911!! My wallet is bleading heli parts!!

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