Just as well i checked the 10 and 12 hp motors i have, won't physically fit where they need to be #$@/@#$�@$.
Someone somewhere must have a 8.5hp 22mm straight shaft. They must of used that motor on some type of other machine and not just on the @#$@�@ Yardbug.
Could use the 6.5hp ebay motor, will have a think.