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  1. Ed Clark

    Alternate Method for Lubrication of Rotary Valve Driveshaft Gears on 717's

    I will repeat what others have said and which I strongly agree with in that the Rotax/BRP method of lubricating the crossed-helical, bronze-on-steel, rotary valve driveshaft gears is somewhat over-engineered. Oh, no doubt the design works perfectly well in it's original configuration. But, after...
  2. Ed Clark

    Clutch Slipping aka Cavitation aka Ventilation: AI's Take on the Whole Thing

    So, any of you that have ever driven a straight shift car with a worn out clutch will immediately recognize the analogy to a sudden loss of power on a jet drive system. To get a car with a clapped out clutch rolling, one must ever so gently ease the throttle on. Any abruptness in throttle...
  3. Ed Clark

    One Method to Loosen and Remove Stubborn 717 PTO Flywheels

    So, I had occasion to remove the PTO flywheels from two 717 engines. Not having performed this job before, I had no idea what I was in for. I learned that it takes an incredible amount of ass to get these things loosened. At least in my case. Of course I first tried an air impact and it was like...
  4. Ed Clark

    BN CARB FUEL PUMP EXPERIMENT - Point of Interest Only

    So, one of the features of a "BN" style carburetor is that it includes a built-in fuel pump. (Twin carb set-ups have one fuel pump for both carbs). When we talk about fuel pumps in general, we most often are considering how much pressure the fuel pump will develop. Of course, in any BN...
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