stuart macrory

yes i am indeed but i still dont think it is ideal to have a model creep foward on idle,it will also increase landing speed,the guy that owned the plane before me used the same set up with no problems and as i say i had this problem with another model and a guy done something with the low end needle to sort it.when he adjusted the needle it lowered the revs at idle without it cutting out which it was doing with me when i lowered the throttle trim. i had the model ideling at its lowest point with out it cutting,it was creeping foward,this guy made the revs drop at idle even lower to stop the model creeping with out it cutting the engine.he done all this by adjusting the low end needle valve only.

i suppose what im really trying find out is if you have a model ideling and you lean the low needle valve what will happen(will the revs increase or decrease)

i remember with a previous plane i owned was doing the same and a guy kindly helped me,he either richened the low end or leaned it but whatever he done it allowed it to idle lower without it stalling

if any ic engine is running a its lowest idle point without stalling but the plane is still creeping foward is it true or false that it could be doing this because the low needle is too lean? i know for a fact that its not incorrect prop choice.

hi,i bought an asm 1/4 scale pitts second hand and forgot to ask the guy what the control throws are,can anyone help me?   many thanks

i dont suppose you know the factory settings for the 2 needles

many thanks timbo so the twin needle thing really applys to most if not all engines then its just when i bought the engine it sort of promoted the fact that it was twin needle as if it was something special

hi,just bought an asp 120 fs and the instructions are the worst ive seen for a 4 stroke newbie like me.i can see the high speed needle but is the low speed needle the one that has a spring on the screw beside the fuel inlet nipple also there is a slot head grub screw in the centre of the throttle arm(what is this for??) also when you push the throttle arm to the fully closed position there is still an opening in the carb of about 4mm and 1 last one what is ment by twin needle on this engine please help as i really want to get this engine going many thanks 

so from where the engine is set now do you think i should try to lean it bottom end ever so slightly?

sorry if im causing any confusion

yes the manual says the mixture control screw which im assuming is the low end needle is about 1/2 inch or less from the main or top end valve,the only other screw i can see is in the centre of the black plastic throttle arm which i thought was only for adjusting the postion of the arm.

on my 55ax the 2 valve screws are right beside each other,but what your saying is that you screw both clockwise to lean and anti to richen?

sorry eric,i was asking, to lean the top end i know to screw in the main needle but the lean thebottom end do i screw out the mixture control valve? (botom end needle valve)

thanks eric,so would i be right in saying that to lean the top end you close and to lean the bottom you open?

hi all i have an os 55 ax that is mucking me about, i have the engine fitted in a kyosho edge,problem is when in flight(never on the ground)if im flying at full throttle and then snap the throttle shut after a handful of seconds of the engine ticking over it will then cut and i have to perform a dead stick landing.i dont have much knowledge on tuning engines but a far as i can tell all is well.it throttles up smoothly etc hope someone can help could it be too rich bottom end???