YS 160 DZ

[Bill Glaze]

Bruce:
You may have hit on something, with the QC issue.  The last Y.S. I 
bought was about 4 years ago, (a 1.40L) and all of the Y.S. engines I 
bought were Out-of-the-box deals; just open the main jet 1-1/2 turns, 
start the engine, lean to ~ 1-1/4 turns out, and go fly.  (Any break-in 
I did was in the air.  No bench time.)  So, it's possible, I guess, that 
the QC issue could have recently raised it's ugly head.  Not having the 
occasion to buy a new engine for some time, I really don't know how the 
new stuff is coming out of the factory.  It'll be interesting to see how 
the 1.60 behaves when it does finally hit the market.  As I recall, all 
the Y.S. engines with the (possible) exception of the first one, (1.20 
SF) required some revising by the factory  to obtain customer 
satisfaction.  We'll see.
Bill Glaze

Pattrnflyr at aol.com wrote:

> I had a YS91 that ran and ran for 8 years.  I had two other 91's that 
> didn't run no matter what.  I had a 120NC that was a paper weight at 
> best.  I had a 140FZ that ran and ran for 3 years.  When you have an 
> airplane that is an engine specific design, you are kinda stuck.  I 
> bought a 110, no luck.  So I go to the hobby store and inspect 8 YS 
> 110's.  Some had poor feeling movement, some had gaskets bulging out 
> from the mating surfaces.  After going through all of them I picked 
> one and crossed my fingers.  The quality between motor number 1 and 
> number 8 was marked.  I took the motor home, the pump wasn't flush, I 
> fixed that.  The low speed screw was out three turns, I fixed that.  
> Then I tighted all the bolts I could get to on the motor.  I broke it 
> in filthy rich on 25% in the driveway.  I currently have three gallons 
> of 30% through it and it has been perfect!  My point?  I feel that 
> maybe YS has a quality control problem.  I have had YS's that were 
> great out of the box and some that nobody, including TN, could not get 
> to run right.  Have I found the problem?  Don't know but this last 
> excersize seemed to work for me.
>  
> See ya,
>  
> Bruce

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