YS120AC problems

[Peter Pennisi]

Thanks Dean,

 

I will pass this great information onto Bruce.

 

Many thanks

 

 

Peter

 

Peter Pennisi

Pentagon Systems QLD Pty Ltd

P.O Box 4280

Eight Mile Plains

QLD 4113

Australia

Phone:    61+0738414234

Fax:        61+0738414264

Mobile:   0408007206

Email: pentagon.systems at bigpond.com

  _____  

From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
Behalf Of Dean Pappas
Sent: Thursday, 23 September 2004 12:11 AM
To: discussion at nsrca.org
Subject: RE: YS120AC problems

 

Hello Bruce and Peter,

As you know, the regulator screw is both the idle and mid-range adjustment.
A tight (non worn-out) AC will idle beautifully with a rich regulator. If it
is only a little bit rich, then the engine will appear to subtly richen at
1/2 throttle and full power in the air. You may not even notice much of a
rich transition, but this does happen. If the regulator is set even more
rich, then the idle-to-WOT transition will be slow and blubbering rich.

 

What we need to know to help you better is whether the engine is definitely
rich during this slow transition. You can prove this by briefly pinching the
fuel feed line  as you push the throttle up. Stay out of the prop's way as
you do this, as it may backfire lean and spit the prop off! If the pinch
test improves the transition, then lean the regulator 1/8 turn at a time,
and reset the needle valve at full throttle, each time. I have seen the
regulator screw run anywhere between one turn out from flush and several
turns in from flush with the housing. Put a fresh O.S. F type plug in the
motor, as well. 

 

When you say that it smokes a lot, does that mean while running (probably
rich) or after the engine stops (probably lean)?

 

Let us know how it goes,

    Dean Pappas

 

Hi Peter,

 

I am still having problems getting my YS120AC to run properly, even after
putting in a new piston and ring.

The engine seems to idle okay, but is sluggish to pick up revs, even after
adjusting the needle. I have replaced the regulator plunger and ring and
fuel line, but no improvement. It also smokes a lot in my opinion. Have you
got any ideas! 

 

Regards,

Bruce Hunter

jhbh at tpg.com.au

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