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Old 08-10-2009 | 01:09 PM
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Flyin Beagle
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From: Lexington, KY
Default RE: O.S. Max-H 40 Help Please

I robbed a screw out of an OLD engine I had laying around and it fit the air bleed perfectly. I doctored up a gallon of fuel with 10oz of Klotz Beenol castor to bring the total oil content up to approx 25%. I began the breakin yesterday. WHAT A MESS!!! I set the needle valve as sloppy rich as I could get it and keep the engine running. I downloaded a manual somewhere for this motor and began following the breakin instructions. I would run the engine wide open for 2 minutes and then shut it down to cool for 2 minutes. I did this for 3 tanks of fuel, Approx 45 minutes (the manual called for 30 minutes). The engine barely got more than warm to the touch, and it was 95 degrees out.
The manual then instucted me to lean the engine untill it just broke into a 2 cycle run and follow the same procedure. During this time the motor would get very hot (too hot to keep my hand on for any period of time, but not hot enough to instantly burn) so I would allow it cool for much loger periods while I had a few flights with my other planes.

Question #1 is is it OK/Normal for the engine to get so hot?? I know the engine was getting plenty of oil as it was blowing it everywhere, I had a huge puddle on the table where i was doing this and it was running across the table and dripping on the ground. The entire fuselage of the plane was covered with oil dripping off all along the side and the wing. Honestly I have never seen so much oil in my life.

Question #2 When I was doing the second part of the breakin the tuning of the engine was very inconsistent. one time I would start it and it was in a slightly sloppy 2 cycle, shut it down to cool then restart and It would be 4 stroking like crazy and I would have to lean the needle to get it just into a sloppy2 cycle again. Shut it down to cool start it up and it would be screaming I would richen the needle back to a sloppy 2 cycle. Is this normal during a breakin for the needle to be so inconsistent. If not what else could it be???