Mine sound very simular to whats happening with some of the other YS110 engine but mines
starving. Idle setting screwed in all the way or out three turns makes no
difference. I've done EVERYTHING that I can't think to do. Mine, however after 3
new fuel systems, plugs, cleaning, O rings, seals, fuel, I've found at the idle
below 3000 the fuel line from the front of the crank to the carb is full of air,
at least 3/4 of the line is all air. bump the motor above 3000 rpm's and the air
in the fuel line mentioned goes away. Sitting on the ground it'll idle all day
long, but in the air flying, idle set at 2200 or so it'll quit 9 times out of 10
at or about base leg on landing. It was bought used and has had this problem
from day one. I own 4 other 120-140 model YS motors and am well pleased and
never had ANY troubles that wasn't quickly sloved, but this problem has got a OS
91 now on the nose for a quick fix, but really would like to get hte 100 hoss back on the nose. It shouldn't be that big of fix, but I have
to go with Dave's suggestion and send mine in also. If this is and issue that
only a pro can fix(reworking a diapham) than it's almost in need of a design
change. However there are some really tiny parts in the regulator that can
eaisly be put together wrong. Mines coming your way to soon as the mail runs
Monday, Thanks, Dave.
Jamie in Alabama