i have a brand new enya 45 model 6002 and the muffler and the cylinder both smoke after 2 minutes of running it as rich as it can be. I've tried leaning it out some but, then it just won't start[:@] any suggestions will be helpful

smoke doesn't mean you overheated it, just that you have something that is smoking on it! (yeah, sounds so simple!) it probably came coated in some light oils left over from manufacturing/storage.

leave a drop of water on the cylinder head if its not in a cowl, the water should evaporate in like 4 secs ... if its less then the engine is hitting over 230 degree F, not good for the engine. Did you touch the engine to see if its like too hot to touch for even 2-3 secs?

hey tianci i did touch the muffler after a minute of running it and got a good burn from it so i then poured some water on it which started to bubble

Can you richen the engine till it quits with lots of smoke/fuel from
the muffler?? If not maybe it sucking some air from some where
needle valve,carb, carb rotor stop screw and or fuel lines causing
a lean condition making your engine run hotter..

Dude ... the muffler will get VERY hot even if the engine is running rich! I learnt that from my new Saito and I got marks on my forearm to prove it!!! Hehehee ... its the engine head that you want to take the temperature from. What Raideron says might be true, the engine might be leaking somewhere. If there is a leak most times the engine will still idle for a little while if you cover the carb with your finger.

Your definition of hot may not be the same as mine. Try to see how hot the head gets. I always check my engine head temp after I land, I can touch it for like 2-3 secs. That will usually mean only about 200-210 degrees F. For RC cars its easier, we fit a temp sensor to keep the engine at about 220-240 degrees F.

They say up to 300 degrees F is fine for our engines. You should be able to touch the engine briefly after a run without getting burned, but the muffler is another story.
Dennis-

Man ... 300 degrees is burning hot ... no kidding ... I did overheat my engine before and it lost power and I think that would have been in the region of about 300 degrees!

Is the engine cowled? What's the enviroment like (temp & humidity) and are you running it on the ground or is this flying?

If it's warm and you ground run the engine for too long it will overheat. In the air it should be fine unless it is tightly cowled.

hey ksechler i am doing a ground run and then engine is cowled but it's usually only 10C outside and i was running it in the shade. I did run it today an after 2 mins of running I checked the temperature of the head it had came back as 365C [X(] I think the problem might be the old tubing i have on it from the muffler to the gas tank

Your problem is the cowl. Never run a cowled engine that long on the ground, especially at high RPM's. Take the cowl off if you're gonna run it on the ground and fly it without the cowl the first time so you don't have to worry about it over heating.

aint nothing like leaning an engine more to get to run hotter.
last i check... a smoke trail is healthy
there's oil marks everywhere on a parking lot from me running me savages.
and i hate cleaning the oil off the tail feathers after a flight

air leaks from the tank, lines, backplate, carb, and head can also contribute to everheating.

if the engines are new..you want to keep them running rich to keep them cool,
plus it also help flush out the micro particals.
the tapper sleeving and piston will need time to break in.
on some engines you will also notice the bottom of the rod will wear against
the casing. you should also cycle the engine during break in.
another way to know how you're too lean is the grayist color on the plug's
coil. you can try use cooler glow plugs.

everybody has to master the deadsticks sometimes thou.

Stick Jammer is right. The cowl's the problem. It doesn't matter what the outside air temp is. If the engine is cowled it isn't seeing the outside air anyway. Take the cowl off when you ground run and make sure it has some cooling holes cut in it for when you fly.

As a rule of thumb you need 2 times the outlet area as inlet. In other words the hole in the cowl for leting air out has to be twice the size of the inlet at the cowl. You may need to blank off some of the lower cowl inlet (if it is a round cowl) to direct the air over the head and close down the inlet some. If it is not round you may actully need to open it up some in front. Anyhow just get the airflow over the head and piston area and provide for adequate outlet and all should be fine.

Mark Shuman

phread59,
This engine is overheating while being ground run. No amount of outlet is gonna keep it cool on the ground. If he's gonna run it on the ground for any length of time, the cowl needs to come off.