YS Engines

[BUDDYonRC at aol.com]

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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