YS 140 FZ regulator question

[vicenterc at comcast.net]

I used to have two FZ's.  I learned that the best way to check the low end mixture is to bring the engine from high to idle (make sure that idle is around 2000 rpm) and see if the engine change the rpm in the next 60 seconds.  If the mixture is right the engine will be running at 2000 rpm (Not noticeable change).  If the engine is lean the rpm will start to increase (I believe).  You will need to adjust the low end by turning clockwise the low end adjusting screw.  In the other hand, if the rpm decrease from the 2000 rpm the engine is rich and you will need to adjust the low end by turning counter clockwise.

I use this method for years and it was the best way to adjust the YS 140 FZ.  I believe that works in the L's.  Not sure about the DZ since the design is different.

I know that this is the procedure.  However, I am not 100% sure in determined if rich or lean when rpm increase or decrease but you will find out.  I don't think that you can adjust much by turning the regulator.  Just leave the regulator alone flush with the case.

Good luck,

Vicente


> Just finished a rebuild of my 140 FZ.  High end seems fine.  But the engine 
> slowly dies WITHOUT an rpm increase at low throttle leading me to believe that 
> the regulator is too rich.  With canopy off, I am able to pinch the fuel line 
> and then it will run for a short time before it gets that rpm increase.  I did 
> eyeball the regulator flush with the surface during re-assembly, but I should 
> have laid a strait edge across the surface to be sure.  I have since turned in 
> the regulator a half a turn and it is getting better, but not as quickly as I 
> would have expected.  My question is, if the regulator was so far off to begin 
> with, wouldn't the engine not have run at all?  Is there something else wrong?  
> Don't want to damage the motor, but so far everything seems OK and I will 
> continue to turn that regulator in until she runs right.  FYI, keep in mind I 
> live at 5800 ft so my settings are different from any low altitude folks.  
> Thanks.
> 
> Mike Cohen
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