YS 140DZ fault?

[Peter Pennisi]

Hi All,
 
I tried running my YS140 DZ for the first time on the bench (I am glad
that I did now) without much success.
 
Main needle was set to 2 turns initially and regulator untouched from
factory setting. Rest is usual with 16 x 12 APC.
 
Engine started OK and idled briefly however when I started to open up
the throttle slowly it would start to run hard lean from half throttle
and then stop abruptly (detonated). Then I opened the needle another 1/2
a turn and same result. I then wound the main needle in to 1 1/2 turns
and same result. During this period I started to hear a rattle noise
from around the mechanical pump assembly so I stopped my testing.
 
 
I spoke to the Australian agent and he mentioned that some engines were
getting around with some suspect pumps. He has offered to supply a spare
pump or otherwise send the motor to him and have it repaired. (Yes, not
replaced)
 
My question to everybody is how many people have had a pump related
problem? and secondly is there any truth that the pump may require some
lapping in as he believes the tolerances are probably a little tight.
 
  
Regards,
 
Peter
 
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