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So rotated the boost pin to full boost fuel must of raised boost and egt heaps got upto 3500rpm set off the overheat alarm pretty quick being that it has fresh water cooled exhaust manifold .cruised back to Marina with alarm sounding parked up for the night.just took heaps of water to top the engine back up.set boost fuel back where it was guess I'll just get a 15x15 prop at some stage lol

shame about the prop, but you dont know till you try one

Worst thing is my mate who's a boat mechanic and has a big launch 10 foot longer than ours said I need 15x15 prop I rang the propeller dude he said no way unless it's petrol and can rev high said I need a 21 .I rung propeller services he said 15x15 straight off the bat guess I should of rung him first lol.least I now have a baseline prop of a known brand and model to work out changes needed

good to hear all's well