Pull your front spark plug cap and check the plug well for water. While you're at it, check to see if the hole that allows drainage from the plug well is open.
ok dave,but im running soft slicks at the moment,it was a wild ride ,one cylinder then bang two ,slicks are ok in the wet till you hit a puddle,maroondah hwy is one big puddle when it rains..........................................bring it over paul..we can have a look and while yr drinking beer..we can change yr tyre.. :laugh