New-style breathers are why God made drills, taps, and Dental 10-32 fittings, of which I have hundreds of. All a crankcase breather is, is a PCV valve without the valve. They probably just added a PCV valve. Replace it with a straight barb out the back. A large fuel tubing off the barb and straight out the bottom of the engine compartment, and re-tune the engine! Viola!

By the way, Magnums are really great engines, especially for the price. But they are susceptible to damage from being leaned out. They like to run rich because they unwind in the air and go much leaner once up there. Make them bubbly, and once they leave the ground and unwind they'll have no problems.. Every engine has its own idiosynchrasies, that's Magnum's. The old Fox engines had to be run even richer than that.

Jimbo