Helping my grandson build his plane. He has a enya 60 with a tatone muffler. I do not see a pressure nipple on the muffler. Any ideas as to what to do now? Thanks

you could drill a hole into the rear section of the muffler, tap it and purchase a fuel nipple from your LHS and seal it with some PTFE, i had to do this on one of my Truck mufflers long ago

your engine may be designed to run WITHOUT a pressure feed and just an open vent instead, does it come with a manual or can you find an pictures of an identical engine with the original muffler? (if so, does that muffler have a rpessure nipple on?)

Yes the original muffler had a nipple on it. Long gone in the shuffle. It does appear to have a small screw in the barrel. Not sure what it goes to if anything. Maybe I could use that opening

I will take a wild guess and say that a pressure nipple can be srewed in where that screw is.
One like this"
http://www2.towerhobbies.com/cgi-bin...&I=LXFX78&P=ML

When I build a mousse can muffler, I drill and tap a 6-32 hole and drill out the center of a screw. I'll use thread tape with a jam nut to hold it in place. Works great.

They made 2 versions of K&B .61 in the old days. One with a pump and one without. The muffler that came with these was identical with the exception of the pressure fitting. The non-pump muffler had a fitting and the pump muffler had a plug screwed into the hole. I've got both. You don't use muffler pressure with a pump engine usually.

If you've got the early baffled piston (ringed) Enya 60 then you may not need muffler pressure because the carb wasn't oversized like the later AAC 60X.

If it has the pressure tap, you can always run it without the tap (on the ground.. not in the air) and force it to full throttle to see how it runs. If it leans out quickly, then attach the nipple to the pressure tap and then pressurize the tank and see how it runs after that. It certainly can't hurt anything, that's for sure.. just do not run it lean for a long time. You should be able to tell pretty quick if it is leaning out because it may never make it to full throttle before quitting.

It is a enya 60X probably very old. I purchased it probably 20-25 years ago. I think it had less than a tank of gas. Lost the muffler someplace. It does not have a pump. I don't know what carb it has on it. Other than it says enya and has a adjustment on the top right (looking down at the carb) that has a slide control marked off in increments. Negative towards the back and positive towards the prop.

Just get a pressuer nipple from your LHS (or on line)

The key is knowing WHERE to drill the hole.

But it's pretty simple to figure out.

You want the hole to be:

1) In the widest part of the muffler (AKA the expansion chamber)

2) preferably in an area where the wall is thick to allow room for the threads

This is the carb on my 60X which is the same as yours. The ratchet lever is to tune the mid range mixture with towards the + being rich. The setting is quite sensitive so only go a click at a time if needs be but the centre mark is the factory setting and I've never had to change it. Idle mix is with the air bleed screw on the left and mine is set so the needle covers half the hole in the front. Muffler pressure is pretty much necessary with this carb because it's fairly large.

The 60X is a magnificent engine with its AAC construction. I run mine on zero nitro with 20% all castor. If yours has only had one tank through it then I'd suggest giving it a bit of fairly rich running in for maybe 30 minutes. You'll most likely find there isn't any pinch but this is normal for these engines.

Hey Downunder that is my carb. RCU has the most knowledgeble people that visit this site. Thanks loads.