Hi All,

I have YS 110 that I'm running with a 16x4 APC on 30% CP and I'm having problems setting the idle on the motor. The high end is 9000 rpm, the transition from idle to full throttle is excellent; however, when I throttle back to idle I can't get a consistent idle. When I adjusted the high end I went to the max RPM and then backed off of the main needle about three clicks.

The motor will drop to 2200 rpm and go down as low as 1650 and come back up to 1850 rpm. I can't get the motor to drop to 2200 and stay between 2200 and 2000. I've tired leaning the idle mixture out as far as four turns, starting at 1/2 turn and opening the screw (counterclockwise) 1/8 of a turn at time.....needless to say that took a while. All idle adjustments were made after I throttle up the motor and was bought back down to an idle. Also, I installed a new glow plug. When I pulled out the old one it looked black as if the motor is running rich; however, the motor does not load up.

The altitude here in Palmdale, Ca is 2480 and with temperatures in the high 90's the density altitude is about 4000 feet.l

What I've done to date: I went to the YS performance web site and set motor according to the instructions:

I used the regulator to richen the transitions. It was opened 1/4 of a turn

I brought the motor up to 3500 rpm to ensure there was no surging, thinking this would tell me the regulator is properly set. There is no surging.

The idle screw is now set about 2 3/4 turns out.


If anyone has any recommendations or if there is anyone in the Palmdale area who can assist me in tuning the motor, I'd very much appreciate it

Regards,

Chuck