I have one of those FOX Eagle engines mounted on an original Phil Kraft Ugly Stick, my "retro-plane"! The engine runs great and is pretty light for it's displacement. When properly broken in and tuned it will run literally forever!

The problem is that most modelers don't bother to learn how to properly tune this unique engine.

The carb has two jets, a low speed and a high speed. The low speed jet is ALWAYS FULL OPEN! At idle the high speed jet is completely closed and the low speed FULL OPEN. At high throttle settings the mixture is a combination of the low speed jet (ALWAYS FULL OPEN) and the high speed jet.

Therefore it is VERY important to set the low speed jet first before setting the high speed jet. If you don't do it this way you will most likely NEVER get the engine rich enough at high speed and you will burn it up before you figure it all out.

Get some fuel tubing and set the throttle to idle, just barely open about as much as a small stick pin. Connect the tubing and blow into the engine, adjust the idle mixture until air just barely flows. This is your starting point.

Start the engine at idle and adjust the low speed mixture for a reliable slightly rich idle. Then open the throttle to full and set the high speed needle. Re check the idle mixture and fly.

If you can't seem to get the high speed rich enough then the LOW speed jet is too lean. Remember the low speed jet is always full open ; therefore the high speed mixture is a combination of the low + the high mixture setting.

If this is too much for you, buy a perry carb and adapter.

These are great running engines when properly set, and you can buy them on EBAY for less than $50.00 in new condition because no one bothers to learn how to set them up.

Good luck!