That's interesting Paul - the latest full catalogue I had was mid 90s - and all said they were the same. Thanks, have saved it for future reference
Maybe they were starting to have issues as the 600's got older and had to do something.
It was the second doc that I saw about the governed speeds - no wonder they reckon a briggs 550ex (7.5nm) has nearly as much power as a PT (8 nm) - the PT is barely spinning over at 2600 rpm -
