Hello fellow Rotax owners. I have a very strange problem on my push-prop SeaMax M22 with Rotax 912 ULS. The engine has about 120 hours on it and was recently shipped with the airplane transcontinentally in a container.
A very experienced SeaMax pilot (4000 hours on type) flew it before and after the shipment. He noticed a little roughness when he flew it after the shipment and we inspected the engine. We found that the plugs on cylinder 1 were both fouled with velvet black, even though cylinder 3 was fine. At the time both 2+4 were fine too. We replaced all 8 spark plugs with NGK IXU24 iridium plugs. We also replaced both carburetor flanges and one plug wire connector that read below 4.4 kOhm - the others were 4.6-5.0 kOhm.
We flew it again for an hour and it flew fine - smooth in all phases of flight, idle and taxi. But we pulled the plugs again to be sure. Now both 1+4 are fouled, with some soot coming out of the exhaust as well.
I read this post which appears to say that this is normal. I'm not sure I agree, but I am new to this engine.
Does anyone have any recommendations on where we should investigate further?
Thanks very much,
Matt
A very experienced SeaMax pilot (4000 hours on type) flew it before and after the shipment. He noticed a little roughness when he flew it after the shipment and we inspected the engine. We found that the plugs on cylinder 1 were both fouled with velvet black, even though cylinder 3 was fine. At the time both 2+4 were fine too. We replaced all 8 spark plugs with NGK IXU24 iridium plugs. We also replaced both carburetor flanges and one plug wire connector that read below 4.4 kOhm - the others were 4.6-5.0 kOhm.
We flew it again for an hour and it flew fine - smooth in all phases of flight, idle and taxi. But we pulled the plugs again to be sure. Now both 1+4 are fouled, with some soot coming out of the exhaust as well.
I read this post which appears to say that this is normal. I'm not sure I agree, but I am new to this engine.
Does anyone have any recommendations on where we should investigate further?
Thanks very much,
Matt
