Clarence Lee

Engine cleaning: DON’T use this product!

Jul 07, 2011 1 Comment

Q: I have a 180 Saito that I ran for a 1/2 gallon of fuel and decided to go with a larger engine. It had some brown residue around the muffler port, thinking I would clean it up I sprayed oven cleaner on it. Now it is a dull gray and looks 100 years old. My [...]

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O.S. Needle-valve replacement

Jun 23, 2011 2 Comments

  With regards to the O.S. pumper engines, I have the original series O.S. 120 surpass with pump and c12 carb. this engine was recently involved in a dispute with the ground about 40 yards from the runway, and well, the plane lost the argument. But the engine survived, kind of. The needle broke off along [...]

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Gas engines & after-run oil

Jun 23, 2011 No Comments

Q: I own a Ge20 ei (Zenoah G200PU) gas engine, model X374320000.  I ran it a few times and it was OK.  Then I set it aside for 6-8 months and then it would not run. I discovered that the carburetor fuel metering/diaphragm was no longer flexible.  So I got a repair kit and replaced [...]

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Counter-rotating props

Jun 13, 2011 No Comments

Hi, I have a question regarding 2-stoke model aircraft engines,  and multi engine aircarft. Can 2-stroke engine be made to run ccw and just reverse the mounting of the prop? Why do I ask?…aircraft like the P-38 had counter rotating engines, which I assume was to counter the two engine’s torque. Also, why wasn’t this application used in more [...]

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Inverted 4-stroke questions

Jun 06, 2011 No Comments

Mr. Lee, I have been a long term reader and thank you so much for sharing your wealth of knowledge!      My question: I have installed a Thunder Tiger 91 4 stroke in a P-47 with the head at about 7 o’clock position. (Not quite totally inverted). So now the drain nipple on the bottom [...]

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Running lean in flight

May 27, 2011 1 Comment

Hi, I have a new  O.S. Surpass FS 120S III and the engine looks good in low idle but when I go to the air the engine become lean and the max revolutions are to low.  I tried any needle adjustment but the engine don’t have  enough power. Regards, Carlos V., Venezuela Dear Sr. V., [...]

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Inverted issues

May 22, 2011 2 Comments

Clarence,     I have a OS BGX-1 mounted inverted in a one-fifth scale Pica P-40. I am using a J-Tec muffler.This engine is very hard to start. I usually have to turn the plane over, place in a cradle, then it starts, by hand, easily. I then shut it down, put the plane back on its [...]

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Coleman fuel

May 16, 2011 No Comments

I tried Colman fuel on my Fuji BT-32B and my Zenoah G62 with C & H Electronic Ignition. Both engines ran fine with the Colman fuel and Evolution Synthetic oil mixed 35:1. I have on the BT-32B a relay kill switch that shorts the magneto and on the Zenoah G62 I have a electronic kill [...]

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