Hello
I was just wondering if it was normal during the first few tanks of fuel to have the oil that is getting on the plane to have a silvery look to it. I have about 5 tanks through it now. I am hoping that this is normal engine breakin wear and not something that is wrong already. This is a .90c size enya.
Thanks
Jeff

Something definiteley not right in this engine. I would not run it any further. take the backplate off and see if the rod journal is making a wear mark on it. Two gaskets may fix it. This is the most common cause. Is there any endplay in the crankshaft? Best bet may be to send it back because of damage already done to other parts.

I have been running Enya 4 cycle engines for almost 20 years. They are no super powerhouse engines but will last forever if broken in right. I am puzzled by the "silvery" look to your exhaust. Usually if the back plate is being scored the residue will go through the engine and come out black, with possible metallic chips showing if the gouging is severe. Can you hear or feel any rubbing or scratchy sounds as you turn it over? If so, I would send it back as the previous poster recommended.

What actually happened was I had about 3 flights in and on the 4th the exhaust muffler fell off and I noticed the color of the oil on the side of the plane. I would describe the color more as a graphite color and I dont hear any bad noises when turned over. I won this engine in a raffle probably 4 years ago and am just now getting it in a plane, so I really havent got anyone to fall back onto in the way of a warranty. I have heard where these motors are hard to get broke in. It seemed as the more flights the I had the higher the rpm was getting.
Thanks
Jeff

Before the muffler fell off, it would be wearing between the muffler flange and the engine exhaust flange causing the metal particles. If you found the muffler, file the two flanges flat again. Put a piece of Kleenex in the exhaust port to keep filings out of the engine. Tighten the muffler screws good and tight. Lots of vibration there.

A thin smear of "Form-A-Gasket", available at automotive stores, will help too. The loose muffler explains the metallic look to the oil.
Check out http://www.quiknet.com/~pheller for some of my Enya powered planes going back to the 80's - All still running fine! how many O.S.'s and YS's can say the same?

My muffler that this motor had was the thread on type that screws onto a threaded header pipe that comes directly out of the head. Do these enya not need any fuel tank pressure? The muffler did'nt come with a pressure nipple to use to pressurize the tank. I dont think that the muffler coming untreaded would have caused the discoloration in the exhaust oil.?
Thanks
Jeff

The vibation that unscrewed the muffler is enough to rub the muffler threads enough to cause the fine metallic dust in the exhaust. I drilled my muffler and installed a pressure tap nipple to use exhaust pressure. Works fine.