Thanks guys,
The local briggs dealer i spoke to wants to charge around $300 for a b&s 550. If i can get a new one for $250 i may well just put a B&S on, the only reason i looked at the Honda was it was only an extra $15 from what i was quoted for the B&S.
Will get the motor off this weekend and see what the clutch and keyway conditions are at the very least. I still need to see if i can that muffler off at this stage but i dare say at $250 for a new motor that will reduce vibration i wont be able to get that idea out of my head.
Thank you again for all the info.