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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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Boca Bearings MX engine bearings

Apr 15, 2011 No Comments

Think all bearings are alike? Not so fast! Boca Bearing’s new MX bearings can work harder under harsh conditions, where engine shafts have to deal with a lot of side and radial load. These new bearings are avilable in a standard high-speed version with chrome steel balls or races and as a ceramic hybrid, with [...]

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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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Return of the Stinger!

Apr 01, 2011 No Comments

We all remember the famous Lanier Stinger, well Great Planes is re-releasing it as the Stinger II. nicely done and it’s an ARF

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