MB290 Update. I have many many hours on my Mb290 now. I had to slot the carb screws some time ago. This engine is stll running very good. It,s top RPM,s has increased a lot too. The thing screams. If it was not such a light weight powerfull leaf blower....I would have the engine in an airplane. The 2nd one I bought the recoil and the throttle arm broke, right away. I took it back and the only thing they would do is replace it with a new in-box 30cc Homelite blower. The Hommie is smooth...but it does not blow leaves/air as good as the Mac! I may have to modify the 30cc and put it in a airplane. HA! Has anyone besides... foodstick...got a Mb290 in the air? Thanks Capt,n