I am looking to repower my MTD 24 with a Tecumseh 5.5 hp with a 6.5 hp and would like to get some input. I'll have to put a 3/4 to 7/8 inch shaft bushing on the motor output shaft. The Tec has been pretty reliable, starts easily and will throw a foot of average weight snow 12 to 15 ft, but it struggles with the end of driveway or heavier snow. I am looking at either the Briggs 950 snow engine or Predator 212 cc . I have read that Briggs has had some valve train problems and not sure it they have been resolved on the 950. The non-hemi Predator seems to be fairly reliable, but can be hit or miss on quality. Anyone with experience with either of these engines?