This seems more of a Briggs & Stratton issue than with other engines. I think the Argo design needs revision to another engine, the internal fan is too small. Its noticeably smaller than a Kohler, Honda or Generac. Secondly, the jetting is way too lean. Mudbug 3 dramatically changed his engines performance as described. I think part of the problem is taking a base B&S engine and putting it inside a machine that is only moderately vented to let cool air in and hot air out. The factory position of the oil cooler is on the wrong side of the engine (where there is no air flow). The recoil starter is pointed in the wrong direction as well. These are just a few of the flaws I've noticed. Argo could work wonders with a base engine that is water cooled and fuel injected at the Frontier level.