RE: Problems starting my OS 46 LA
That engine should easily idle between 2500 and 3000 rpm. With the engine running at wide open throttle, lean it out to the peak and then richen it up 300-500 rpm. Now bring down the idle and adjust your throttle trim to bring it as low as you can. The low end is set a little rich from the factory, so you might want to make a small adjustment to the airbleed screw, but not before you've checked your throttle transition. The manual for the LA explains exactly how to check it. Once you have the high speed and low speed set, these engines are nearly bulletproof, and are easily started. As you've already discovered, they tend to like to be a little "wet" to start.