If you have been experiencing problems such as finicky needle settings, "flameouts", running hot, you may be interested in these modifications. Applicable to Eagle .60 engines versions II through IV.

This easy to make addition to your Fox tilt-up/dn series muffler lowers sound level by at least 5db and does not reduce the output power. Inexpensive and light-weight too.

A reprint of a test report done some years ago by Duke Fox with the results of his efforts to reduce the noise level in 2 cycle engines. Interesting reading for those pursuing after-muffler and propeller options to reduce noise. (pdf document)

Modifications to the head button will lower the operating temperature and make needle settings less critical.

Although it has changed little in appearance since its introduction in the mid 80's, there have been numerous internal changes over the years that have affected running characteristics. Here's what you need to know to get the best from your Fox .40.

If you have been experiencing problems such as finicky needle settings, flameouts, running hot, and lots of deadsticks, you may be interested in these modifications.

No amount of adjusting and fiddling will help an engine that is damaged, worn, or just plain "cooked"". This page provides some simple procedures you can perform to help determine the condition of your Fox engine.

For those of you with the facilities, and machining skills, these modifications will allow your Hawk .60 to reveal it's true, and considerable, potential. Note: not for the novice engine tinkerer!

Since the Eagle II .60, upon which the 1.20 is based, exhibited some problems, it should not be too surprising that the 1.20 twin does as well. Fortunately, the 1.20 responds just as well to the same modifications that we have used to tame the .60.

The .45BB has been a pretty good engine over the years, but we did stumble upon a way to improve it.

The current .25BB is a great little engine just as it is. However, if you have an earlier version some improvements can be made.

While it had loads of power for a .19 there were also a few problems with this engine. Hot running and carburetor midrange problems are addressed here.