I have a 1990 550sx piston port motor to which I have fitted crank seals, carb overhaul including needle & jet, cylinder hone & pump overhaul.She goes like a dream now once running but will rarely start with the pump in the water. I'm assuming the extra drag slows the starter down too much too get it going. I have a new battery & leads but it soon runs down and I resort to jump leads.I checked the compressions and am getting 125 & 105 which I guess won't help?I would appreciate any suggestions of checks I should make. I'm thinking of overhauling the original starter which I read on here is advisable rather than fitting a cheap one.Should I be thinking about swapping the flywheel. I've also read that the magnets become weak with time. The spark looks fine when cranking out of the water though.Thanks guys.