ORIGINAL: Flyboy Dave
Lemme start from the top....but let me say that I'm not an old OS
basher....I'm a new one....
mstroh3961 ....Marc...3 flights, of about a minute each. The thing ran perfect
for about 2 years, then took a dump ! It started up fine, as usual....but just
a minute into the flight it died....right overhead....it sounded like it ran out of
gas. I figured that the plug went....and rather than start screwing with everything,
carb and such....I put a new plug in it. Again, started right up....sounded fine.
I opened the needle 3 clicks just for the heck of it....a minute later....dies again
in flight.
Now I'm starting to wonder. I start it up again....looks good....I"m checking
for bubbles....nothing. I let it warm up, and open it up....I need to get a good
setting on it to see what the hay. I set the needle as rich as I could (too rich)
and still have it into a full 2 cycle run....up....a minute later, dies again.
One of the fellas said it sounded kinda wierd to him....but it sounded Ok to me.
I pick the plane up....it is devoid of compression. We thought the rod had broken,
because there was no resistance at all. I even pulled the plug, and put an allen
wrench into the bore, and turned it over. The piston was going up and down.
It should be said at this time that there was some "black" in the oil residue for
some time, but most ringless engines I've seen....do spew some black.
I pulled the head....and sadly the engine had self destructed....the cylinder
bore was wiped out. I had not seen this happen before. Like I said.... the engine
was new to me....and truthfully....I had no idea when the engines were
manufactured, and I didn't know the engines had the inferior nickel plating.
I don't think anyone can argue....at this point, that the OS plating is not inferior.
The engine never ran on anything but PowerMaster 15% sport fuel, and never
had a lean run in it's life. It had the recommended 12-8 prop, and turned 11,400
....just what Macs said it should with his pipe.
This motor was second on my favorites list....right behind my 60 FSR's. I guess
the liner just wore through the plating....and it was a gonner. [
]
Dave.