cox 049 engine

I have discovered an old 049 cox engine amongst my stuff and I am looking for a bit of info.

So far, I have managed to get it to fire, but not run if I take off the glow-head and put 3-4 drops of fuel directly into the engine. It is not running yet.

Does anyone have info on mixture settings, or a good starting point?

Ive seen splits too, caused by vibration and brittleness.

We used to just cut a new piece of fuel tubing, drill a hole in the side of the existing tank, and route the fuel tube from the needle valve nipple out to an external tank. 3 minutes of flight is not RC flying.

All cox engines with the ball and socket rod to piston connection should be run with 20% minimum castor fuel, period. That is unless you want to invest in the tool to swage the fit back to normal after a few flights. They run
OK on 20% nitro but are much easier to handle on 30-35%.

I only know of two - the TD range with front induction, and teh reed valve sort.

Stripping teh reed valve down by removing the intergral tank and cleaning it up in fresh fuel generally unsticks them and allows blocked needle cvalves to be cleaterd

Frommemory, if all reassembles correctly, 2 1/2 turns on the valve, prime till the plug hisses, flick and she goes. If not reprime - its impossible to choke the reed valve ones.

lean off once warm till it almost 2-strokes and chuck.
Never had a TD.

Sure its not a pee wee 020?

ASnyway,. its a reed. Strip the tank off teh back and wash out dried up fuel and oil and take the reed out and wash that in fuel.

What all this fuss is about is the fact that over the years, the pliability of the fuel line goes away and it will start leaking air where it attaches to the back plate.

Yea, but three minutes of spinning around is long enough!

1-1/2 to 2 turns out from closed should be a good staring point. You should be able to just squirt a few drops of fuel in the exaust port for a prime.

you didn't say what style it is. There were a couple of different types, the most common was the 'baby bee,' there was also the 'space hopper' and 'tee dee.'

I'm guessing that you have the baby bee. If so you may need to remove the tank and replace the fuel line and clean the reed valve. The fuel line they used would get rock hard after a few years.

They also need a high nitro fuel (~25%) to run well.

It wasnn't intended to be. It had a different function from what we use in
RC installations. Fact is, it was still pliable when new and would seal around the nipple. After a year or so, it list its pliability and would sometimes even fall off!

It won't run if you take off the head..... It'll lose all compression...

Seriously, which Cox .049 is it.. Can you give a better description of it??
Cox made many different .049s and they had different starting habits..