Hey Dave,
You could call it a whirring noise I suppose. Thats a good suggestion about too long I bolt in the cowling so I'll check that out tomorrow after work.
Good point about a carb/ gasket leak as it starts very easily - 2 pulls from cold.
Not sure what you mean by the spark plug/ gasket washer cracked so blow by? Could you explain that one a little more?
Its deffinately a contant whistling/ whirring sound. For the life of me I cant work it out?
