ORIGINAL: oldtyme
ORIGINAL: ameyam
No, I didnt say all OS were bad, just the few I has somehow. By the way, both the 55s did a year of flying befor they went bad. The 75 started troubling in a few months.
That purple discolouration on the piston skirt is a camera artifact. Actually, the piston skirt and rest of the piston is dull gray, not shiny gray, which I think is to be expected. The scoring is only on the exhaust port side, thats where its deep
Ameyam
I'm beginning to wonder about the 75AX. A friend of mine just put one in a Revolver and we took it out to the field. About 6 of us have tried to get the engine to run right to no avail. Most are very experienced engine people. After about 2 hours of fiddling he managed to get it in the air and after about 3 mnutes of flight the engine flamed out. Unfortunately the plane was not in a good position and this cause total loss of the plane. The plane has been replaced but now we're all wondering whether he should return the engine for a replacement. Yes the fuel was new and the glow plug(s) were new.
When I was just learning the in and out of engines I choose to only have one instructor, more then one and therre was always a problem, 6??? Ever think it could be a problem with the planes set up instead of the engine? Things like this just makes me wonder.