wavehumper. i so want to get to the bottom of it and say 'yeah, this was the problem!' but i can't! first of all thank u to everyone who replied to me. everyday i would go to the boat and try out what you all said. the mechanic came and went. he recommended a suzuki diagnostic check. boat currently off west coast of ireland and this will be done @ first opportunity. in the meantime the damn engine has , how can i put this, improved. alan mck u are right the fuel connector is a dodgy affair and has been given the twice-over but still is under suspicion. graeme c, the new fuel has done no harm at all; jahno et al. i now rate the fuel supply system as absolutely critical but lads believe it or not the major improvement came when i pulled out he bastard emerg. cord stop and put it back again. it should be digital (on or off) but it's kind of analog and has a sticky feel to it. i wish i could say it's perfect (and lets face it - it's a world-class engine, controlled by a chip which knows if the crew are farting and adjusts the intakes accordingly-so it should be) but it now needs priming when we start off and gives an odd splutter. THAT SAID there is a massive high over ireland at the moment and we spent the whole day bumming round galway bay. glorious. what can i say. we are logical men on this site and we know there is a straightforward reason for everything. i've lost a lot of that very unscientific notion - trust - in my engine though. if i finally get to the bottom of the problem, or my psychological disposition which thinks i've got a problem, i'll let ye know. good luck and sincere thanks.