So I just bought one of these, it had about 2 gallons FT and put it in my vibe 90. I have ran the OS 91sz-H with pumps in the past and never had a problem tuning and running them. The engine came from up north so I figured I should just set the needles to factory start up spec and go from there. The YS engine seems like it puts up much much more smoke than the OS engines so I assumed it was just running really really rich, so I proceeded to lean it out. after doing this some the smoke coming out of the pipe about what I thought it should be and after about a 2 minute hover it died in the air and I auto'd it in. The motor was extremely hot so I let it cool down. Later I couldn't restart it and noticed it lost quite a bit of compression so I pulled the head and the liner was all tore up... So now im waiting on parts to come in to rebuild.
Can someone give me a little advice on break in and tuning of this engine because I apparently get an F on todays work. Also I am running the outrage pipe.
another this while it was spooling up it seemed like it was kind of barking( i don't know how else to describe it) and wasn't really a smooth transition.