WELL SAID, flyin-hot, and in a much nicer way than I would have stated it.

EVERY 3W I've owned has had the exact same problem at one time or another. . Either the carb block warps (or cracks in the case of the "Newer design"), the case starts leaking at a seam, you lose a seal in the front bearing, or the ignition starts breaking down causing misfireson one cylinder. And YES, the porosity problems are rampant with 3W motors because the crankcases are cast, not CNC machined. All in all it's a very SLOPPY and badly manufactured product that people just insist in still using.

I've lost 3 airframes (expensive ones) due to 3W's "Coughing", misfiring, or just shutting off at the wrong time. I used to have 6 at one time, now I have three because I sold the others, and one of THOSE is a 240. . never run. The two engines I have on my big planes are a 150 (new style) and an old 140TOC that has been gone through and has all the little problems fixed (DA carb block AND ignition on both motors)

That being said, I'm buying BME's (three received/on order, had 3 others a long time ago. . . wonder why I EVER switched) and have a DA150 just waiting for it's ride to be finished. NONE of my BME's or DA's have ever hiccuped, misfired, or deadsticked due to a mechanical problem (running out of gas or ignition voltage does not count ). I think that just about says it all.