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HelicopterEngines Plugs Mufflers Fuel › 91SZ-H breakin
03-10-2006 07:36 AM  11 years agoPost 1
Ctimrun

Senior Heliman

Southern California

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Have about a gallon through my new SZ-H. It is running very well, but still very rich with both neddles two and a half turns out from closed.

How long should I wait to start leanin it out?

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03-10-2006 09:04 AM  11 years agoPost 2
Daniel Jetschin

Senior Heliman

Germany

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You can lean it out but it should be still slightly fourstroking. Then you can fly it like you normally do but don't over-rev or bog it.
That's how I did on mine..

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03-10-2006 12:41 PM  11 years agoPost 3
airdodger

Elite Veteran

Johnston USA

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03-10-2006 01:04 PM  11 years agoPost 4
ESWLFSE

Elite Veteran

Liberty Hill, TX

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^^Best statement from link above:
The most important thing is to not get the engine lean or to load it during break-in. I also do not want to just sit in the hover with the engine extremely rich. This keeps the engine too cold during break-in and the piston and liner never seat properly. Most engines need this break-in time for about 30 tank fulls. Then I just lean the motor out a little and start flying all out.
Too bad I was planning to sit in a fat hover for many tankfuls.

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HelicopterEngines Plugs Mufflers Fuel › 91SZ-H breakin
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