on my OS engines (2 .46 LA, .40 LA, .25 FP, .46 AX) I've ran them all in the same way, following the instructions. I'll start at 2 1/2 turns from closed, open the throttle 1/2 way,(if your using a chicken stick, plug the exhaust port and with the igniter disconnected flip the prop until you can see fuel reach the carb. if your using an electric starter there is no need to prime the engine) attach the igniter to the glow plug (make sure any loose clothing is tucked in and clear of the prop!!!) flip the propeller until the engine starts. once the engine is running, advance the throttle (slowly) to the highest setting. keeping your fingers clear of the prop arc, slowly turn in the high speed needle until you hear the highest rpm the motor will turn, if you go too lean the engines rpm will drop. run the engine at the highest rpm for 5 seconds, then turn the high speed needle out until you hear the engine "4 stroking" (it will blubber, and be smoking noticeably) run the engine at this rich setting for 5 seconds. then lean the engine out. you will do this for the first full tank. once the tank is empty, let the engine cool completely down with the throttle fully opened and the piston at bottom dead center. after the engine is cool refuel the tank and restart the engine. bring it to full throttle lean the engine out until peak rpm is heard then richen the engine until you hear a slight drop in the rpms. this is where the engine should be tuned. an LA engine doesn't have a low speed needle, it uses an air bleed screw. to adjust this, bring the engine to the lowest stable idle you can. let the engine idle for 10 seconds then bring it to full throttle if it loads up and sputters shut the engine off and open the air bleed screw 1/8 turn restart the engine open the throttle to full then bring it to idle and for 10 seconds again. continue this until the engine transitions smoothly from idle to full throttle. if the engine dies after idling for 10 seconds when the throttle is opened the air bleed screw will need to be turned in.

hope this helps you out. I strongly recommend getting an electric starter. I find the break in process a lot easier as well as fly days, with the starter. I started my planes for the first year with a chicken stick, after I bought a starter I'd say it was one of the best purchases I've made in this hobby so far.