YS 140 FZ to L Conversion Help Needed

[vicenterc at comcast.net]

Ed:

Looks like is too lean or you are geetting uncontrolled air.  The easy fast check is to adjust the low end just 1/2 turn open.  

Good luck,

Vince Bortone


> Folks,
> 
> I need some advice.  I've converted my YS 140 FZ to an
> L.  New crank, crank ring, L throttle barrel and new
> throttle barrel seal.  Great increase in power, but
> can't get it to idle worth a damn.  I either fly with
> a very high idle or it quits in the air after its been
> at idle.  On the ground I have to either set a very
> high idle (>3000 rpm) or it just looses rpm until it
> dies.  In the air if it doesn't have the very high
> idle it quits after any maneuver that needs it to idle
> on a long downline.  It continues to idle but quits
> when I increase throttle.
> 
> Here are some of the particulars:  OS F plug, Magnum 1
> and 1.5 fuel (acts the same with both fuels), 17-10N
> prop
> 
> When this engine was an FZ it ran and idled
> beautifully in this same plane (same tank, same fuel
> lines, same throttle servo).  Just was a little shy on
> power for the Masters sequence.
> 
> Things I've tried:
> 
> low speed need settings from 1 to 2 turns (lots of
> settings in between)
> new glow plug
> removed the regulator ballast
> put in a new piston ring
> drilled holes in the piston
> new diaphragm
> 
> None of the above made any difference I could tell. 
> Have torn it down far enough to replace the piston
> ring and reassembled.  Found nothing out of place.
> 
> Aside from buy another engine, I'd appreciate any
> suggestions.
> 
> Thanks,
> 
> Ed
> 
> 
> 		
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