Clarence Lee

4-Stroke: to vent or not to vent?

May 09, 2011 No Comments

I am a long time reader of your column, first time writer. I have learned a lot from your column, and I appreciate the service you provide with your engine wisdom.  I have been running four stroke model engines since my first OS FS 40 in about 1983. I have always “vented” the crankcase out [...]

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Why replace cam bearings?

May 05, 2011 1 Comment

I want to replace the cam bearings in my OS 120 4-stroke engine.  I have replaced the crank shaft bearings but can’t get the cam bearings out.  Your help would be appreciated. Thanks, Greg Dear Greg, Unless it is absolutely necessary I would recommend leaving the cam bearings alone. If you do want to go [...]

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Tuning a radial

Apr 22, 2011 No Comments

After reading the latest Engine Clinic column regarding the Fox flat twin flameout problem, I decided to ask you about a Laser V200 four-stroke V-twin that I bought last year.  It has a dual carb setup (each cylinder has its own carb), and during break-in I noticed a tendency for one cylinder to flameout at [...]

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Ethanol question

Apr 13, 2011 No Comments

Here in the northeast, ethanol in the gasoline that we buy at the gas station is a fact of life. Clarence Lee has indicated that RC gas engines should be run on gasoline with no ethanol. In the recent past, ethanol was only blended into our gas seasonally, but now I think it is included [...]

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Pumped carb vs. muffler pressure

Apr 13, 2011 2 Comments

Hi :  I read your “engine clinic ” articles all the time and enjoy them.  My question is this.   I was given an O.S. .70  4 stroke “Ultimate:” as a gift.  I would never have bought a pumped engine but I’m stuck with this one.  I’ve been running 4 strokes for the past 20 years a [...]

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