@funkenet: You need to play with the gearing. These are torquey engines, so gear it taller to take advantage of that!
@scott: The same exact thing just happened to me with my clutch!!! I could not believe it....luckily I have a spare engine so removing that clutch will be from way less puller force and way more heat/mallet tapping. PS I got your email...been insanely busy. Will respond tomorrow!