ORIGINAL: ckangaroo70

My 1st SK 90 is running excellent, but had some trouble today with the SK 90 I just recieved a few days ago. After the third tank today it was transitioning great, and even had a nice idle running on the rich side. Decided it was running well enough to take it up in my Hog Bipe which I was using for the test Plane. The Hog normally has a Mag 4 stroke mounted on the nose, but it makes a good test vehicle since the engine is easy to access, and the Plane is a great flyer. 30 seconds after take off a clunk noise occurred and she locked up solid. After a rough deadstick landing I inspected the engine, and found that the crankshaft had broke where the piston rod connects. I am hoping that this engine just had a weak spot in the crank, and is not a sign of what might happen to the other SK 90 I have which is running fantastic so far. My buddy checked the head temp with his laser temp gauge and she read a cool 130-140 degrees, which is not surprising since she was still running on the slobery rich side. Actually it was running along just wonderful up until the time the crank broke. No sign that it was comming or anything. So I got home and sent an email off to Kangke. I've heard there customer service is pretty good, so hopefully they will honor the warranty and either fix it or replace it. I just recieved the engine a couple days ago, so now it seems I am going to have to send it right back off. Well crap happens sometimes, and hopefully this is an uncommon occurence. I have been thrilled with my SK engines right up to the point of that crank breaking, and if it proves to be an uncommon occurence I am sure I will continue to be impressed in the future.