YS Engines

[Del K. Rykert]

  I agree with everything you stated Buddy but wonder what are the ones to do that don't have local expertise to draw from supposed to do? An engine to perform well should not need re-work and rebuilds as often as my YS engines have had. The instructions that come with the engines when, there are any, aren't much help. The cost of all those parts adds up quickly. Case in point. My first YS 120ac was purchased after a rebuild. I flew it assuming everything was working correctly and after 3 months and at 3rd contest had a Canadian friend mention my engine didn't sound right. My reply was how can you tell. I have hearing loss from Nam. It tacked at 8200 on  believe a 15x12 on 15% powermaster. Was told that was ball park. Pulling head cover friend found the e clip was missing and rocker was floating back and forth. $150.00 later and fixed damaged to engine and it ran like pussycat and turned 8500 with needle a tad rich. How do us struggling by ourselves deal with engines that are that difficult unless we are also a gear head. I don't have the means to have the golden 3 rule when using YS's to have one in the plane, one as backup and one getting repaired. That is what many of my friends had gone to while using YS's.
   
                           del 
                 NSRCA - 473
  ----- Original Message ----- 
  From: BUDDYonRC at aol.com 
  To: discussion at nsrca.org 
  Sent: Tuesday, March 30, 2004 8:06 AM
  Subject: Re: YS Engines


  Lance
  I believe that most problems that people have with YS four strokes are caused by them not understanding the basic operation and feeding requirements of the YS design. I had this problem when I first started running them, I had little help here and went through the expensive learning curve.  The best advice that I can give to those that are new to running the YS four stroke is to use the correct fuel and to never force it or run it lean. If it isn't running right SHUT IT DOWN and find the problem. Most problems that I have found that can ruin a good engine are not the fault of the engine but are caused by a fault in the tank, or fuel system. most common of these are trash in the system that fouls the diaphragm regulator or leaks in the tubing both of these problems will cause lean run's and overheating that will damage the engine very quickly the other most common problem is valve clearance adjustment which will cause loss of power if they are loose or overheating and loss of power if they are to tight.
  When these things happen the inexperienced operator start's messing with the needle valve and regulator settings which only makes the problem worse. After the engine is properly set up you rarely have to touch anything except maybe a click or two lean or rich on the needle valve.
  An experienced YS operator can listen to one and tell immediately if it is running properly.
  After destroying a couple of them during my learning period and stupidity some eight years ago I have run four YS engines in several airplanes and logged hundreds of flights on them with little or on problems. I recently purchased two new YS-140 Sport's and so far these seem to be the best yet from YS they ran right out of the box and seem to be as strong as the 140-L if not stronger and I didn't have to mess with the pipe length to get them to run right.
  Buddy        
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