Having problems with three of my enya 90s and was wondering if anyone has had this issue. First of all i have two different planes and three engines total and so far i have tried # 3,4 and #5 enya glow plugs and the OS f series plugs and my engines keep overheating and shutting down. I have used 13, 14 and 15 inch props, 10 and 15% nitro and still no luck. the engine will idle perfect power up and blow smoke but once opened up i get no smoke and she shuts down. There are no bubbles in my fuel line but no question in my mind it is starving for fuel or leaning out. Anyone have any thoughts on this one? I can open up the high end when full throttle and get little or no smoke.

Thanks
Dave

The Enya 4 strokes tend to like smaller props and higher rpm than large and bigger loads. They also like a bunch of break in like gallons of fuel; they will also last 20 years. If the needle is not responding the fuel tubing can be too small or the tank is not located where it needs to be. How old are the engines and what planes are they in?

I tried the smallest prop it calls for and the engines are a few years old so im sure there broken in. the tanks are level with the carb and i have a standard fuel line that i run several twins including a enya 240 twin with no problems. I got these three engines over the winter and just tried running them over the last few weeks. They have good compression, the valves are gapped at .005 to .010 and i have one engine in a jungmeister bipe, a p47 and another in a 60 size trainer.

Dave

Are you saying that when you open the throttle you cannot keep it running by richening the needle?

Sorry, I'm just trying to make sure the symptoms are clear. You spoke of starting at a good idle, then opening the throttle, and it shuts down lean, right? During any of these episodes, did you try richening the mixture after opening the throttle?

Jim

Hi Jim,

I can open it several turns and it doesn't richen it up enough to keep it from getting hot. I am starting to wonder if i am sucking in air somewhere and its leaning out. I asked Ken Enya for a quote for 3 rebuild kits for the enya 90 but not have heard back from him yet. I find it odd that i am having the same problem with three engines. I have also tried a few different fuel sources.

Dave

I have run a Enya .90 4c for several seasons with complete reliability. First off, are you using muffler pressure? Enya says it is not required but I suggest it and does help greatly with reliablity.

Do you have the twin needle carbs?

And do you still have the venturi sleeve inside the carb? There is one in there when the engine is new, and it can be removed for more top speed, it will also decrease fuel draw, making the need for muffler pressure even mor important.

A .91 surpass muffler will screw right on and it has a pressure tap installed already.

Set the carb very rich, fly until the tank is half full or less, land and the set the carb again so it is 2-300 below peak rpm, this will put you right in the ballpark.

I used 10% fuel and the Enya #3 and OS F plugs, both worked well. The #4 and 5 enys plugs are too cold for your engine.

I used APC 14X8 props and got 8800-8900 rpm. This engine has small valves, small carb, intake, etc. It is not a revver.

This engine would turn this prop the same speed as my .91 surpass, although I think the surpass will turn smaller props faster than this Enya .90.

Buy the way, the valve lash should be .002" - .004", same as Saito and OS, you have them set too loose.

I also have one 90 that i have used a few years with no problems. I do have all the tanks under pressure and out of the 4 90s i have two have the double screws on them. I emailed Ken Enya in japan and even though my 90 says in the manual to use the # 3 plug he said the # 5 plug was required for this engine and he sent me three # 5 plugs. I have set the carb as rich as i can and it still leans out and i come down dead stick any time i try to fly. I have several engines ranging from radials to twins, saitos, os and never saw this before. The gage in my enya 90 tool kit is .005 and the kit for my os twin is .005 min to .010 max if the gap was that far out it would run rough at idle but it is perfect.

I took the barrel out of the carb cleaned out everything and didn't see any venturi. I will try a 14x8 APC prop and see what i get but my hopes are not all that high as i have tried 13, 14 and 15 inch props.

Thanks
Dave

Okay, the gauges you have are .05 millimeter and .10 millimeter, this is .002" and .004"

The enya #5 is a colder plug and might not keep the fire lit, but try one anyway and see what happens.

I don't know what you mean by "double screws" ? One may be a air bleed and the other a idle stop / idle speed.

The "TN" two needle carb will have a mixture adjustment in the center of the throttle arm on the opposite end of the carb from where the main needle is located.

The venturi sleeve will be in the rotating carb barrel, if it is there at all.

RC dude,

You are correct about the gage sizes but either way they are set properly. The double screws i was reffering to are the idle screw you mentioned and the air bleed. As far as the plugs go i don't really think it matters if its overheating with either plug i MUST be sucking in air somewhere and need to find it.

Thanks
Dave

There is a O ring seal at one end of the intake manifold and a gasket at the other.

Have you checked to ensure there is no crud in the needle valve assy? That would also cause lean or no running....

I put some form a gasket around the intake manifold to see if it was sucking air but nothing. I did a total take apart and cleaning of the carb. I ran my Enya 240 today with the same fuel with no problems.

Dave

Can you call me so we can talk?

1-978-501-5223

Thanks
Dave