You have said nothing about where you have set the initial needle setting either the main needle or the bleeder screw.

The first I would do is screw the main needle all the way in (makes no differance with this carb if the throttle is open or closed) then back it out two full turns as an initial setting.

Next is illustrated a simple trick for setting all the OS bleeder type two stroke carbs mid range screw. Insert a modelers straight pin into the bleeder hole on the very front of the carb and back out the screw to allow the pin all the way in. Then just screw the screw in untill you feel it touch the pin and that is a good reliable starting point for initial settings.

Then after adjusting the main needle for a peak and then backing off a bit, now just accellerate the throttle and if the engine stumbles heavily just rotate that mid range screw counter clockwise a tad. No more than one eight turn each time untill it accelerates smoothly.

Remember this mid range screw leans the mixture when you back it out.

All the LA series except the .10 uses this same type carb. The .10 has no mid range. Also all the FP series which was the predecessor to the La's used bleeder carbs too. The pictured engine is the .10FP

Agine you need hands on help for operating the engine and flying, failure to seeks mentorship is the number one reason for not realizing the dream. Get Help.


John