i have a cox engine0.49 modle, but do not know the needle setting for the carb.

why?

It has been around 35 years since I started a Cox .049 on a plastic control line plane
I think they called for opening the needle 3 turns for initial startup.
If it just burns the prime and dies; close the needle 1/8 to 1/4 turn, re-prime, and try again

if it is just burning the prime it's not getting fuel so the needle valve should be opened.but I believe youre correct about the 3 turns open,that is usually the starting point for reed valve engines.

thanks guys

how do you prime the engine?

squirt a few drops in the exhausr ports when they are open

i got the engine running but will only stay running for a cuple of seconds, its differnt from a t-maxx truck. dos it need a backpresser line

anyone. it wont stay running why? the little tube behind the needle what is it for?

can you post a picture of the engine,if it doesn't stay running but revs up in max rpm before stopping it is not getting any fuel from the tank open the needle valve 1/2 turn and try again,once it starts and stays running you adjust the needle valve till you get near max rpm.

her it is i got it running for a min/two, how do you tell when the piston/sleeve is bad? do you know any outher modles i can put this engine in ?

i only have the engine. what temps should it be running aruond should it smoke it is a two-stroke. i used traxxas 20% top-fuel in it i know its not right but it runs it is a two-stroke

how big is the tank?the tube behind the needle goes to the tank.is this in a cox plane or what?usually they only have a tank big enough to run 2-3 minutes

its not the stock tank. the tank is prettty big its a two oz tank. yas it is a cox 0.49 killer bee engine .

anyone[&o]

You may get better help on the engine forum or control line forum. I think Cox engines like high nitro high castor fuel - like 25% nitro and 25% castor oil. They may not run well on other fuel. Also, my Cox engines were always fussy - I had to play with the needle a lot to get a good run.

Where is your tank? The picture does not appear to have a tank.

Try your questions on the 1/2A forum. The folks over there were a great help to me and my questions on the little engines. Good luck with it.