ORIGINAL: Aresti-RCU
Pardon my ignorance, but this is my first experience with the OS140RX (coming from four stroke to a Webra 160 to the RX now...) The manual doesn't say how to adjust the low end needle. Which side is lean and which is rich (CW or CCW)?
CW is leaner. It is fairly sensitive, small adjustments, a little at a time, the whole idle adjustment only turns about 1/4 turn stop to stop. Most of my engines seem to end up with the idle adjustment just CW of 'centered'. You want to be able to run the idle as rich as possible and still get a good transition. The richer the idle, the faster the motor will drop to low idle when throttling down.
Don