RE: Problems starting my OS 46 LA
I just got a 46LA and here's is a direct copy from the manual on initial needle setting "Open the needle-valve 1 1/2 turns (for 40,46LA) and 2 1/2 turns
(for 65LA) in the direction of arrow from the closed position". And this is for intitial break in
All internal-combustion engines benefit, to some
degree, from extra care when they are run for the first
few times - known as running-in or breaking-in. This is
because the working parts of a new engine take a little
time to settle down after being subjected to high
temperatures and stresses. However, because O.S.
engines are made with the aid of the finest modern
precision machinery and from the best and most suitable
materials, only a very short and simple running-in
procedure is required and can be carried out with the
engine installed in the model.The process is as follows:
1) Start the engine and, with the throttle fully open,
open the needle-valve an extra half turn (180°)
from the optimum setting. This will produce a rich
mixture that will result in cooler running. Allow the
engine to run out a full tank on the ground. (Avoid
dusty surroundings.)
2) Now fly the model with the needle-valve re-set 20-
30 degrees open from the optimum setting ( i.e.
40-60° from the highest rpm setting ).
3) Close the needle-valve very slightly on successive
flights so that the engine is running on its optimum
needle setting at the fifth or sixth flight.
I followed the inital 1 1/2 turns, primed maybe two blips and it fired right up ( I use a starter).
I have ran three tanks of fuel through the engine thus far, for the first two tanks (with needle backed out 180 from 1 1/2) , it would not idle. 3rd tank it did much better. idles well. hope to maiden it this weekend. What size prop are you using?