hi i have 3, single cylinder lister engines i was going to use one for my boat.
ac1 series 1
ac1 series 2
ad1 direct injection
ok i chose the ad1 7.5 hp however when started it vibrates quite a lot. so i fitted the ac1 series 2 which is smooth and has only a small amount of vibration and just 1 hp less
my question is why the big difference in vibration. there seems to be very little difference on the out side.
thanks in advance. garry.