I have a problem I would like some help with; the moment I put the seadoo challenger in the water all is perfect, starts up nice, runs fantastic.after I run it for about 30 minutes, and then shut it off,,, it will become a b....to start up again.the carbs are not flooding,(all new needle/seats etc, correct pop off pressure,correct oil/fuel mixture(pump cable adjuster). the moment I change the sparkplugs, they start up perfectly. then ,same thing again. If I run the boat for half an hour or 4 hours, (does not matter) ,and turn the engines off, same thing happens .no start. change s.plugs, they fire right up. I use BR8ES NGK, are these to "cold"? our fuel octane rating is low.would compression play a role? engines have about 130 hours on them. and when they run,,,, they run perfect. it is just the moment when you turn them of and then want to start them again.
o yes,,, no water in fuel either.
this thing costs me a fortune in sparkplugs. what other plugs can I try? or should I try to mill the heads or add octane booster to fuel and see what happens...
hope to get some info or tips
BMB

want to add one more thing: I checked with other seadoo challenger 1800 owners,,,and guess what. they all basicly suffer the same symptoms. so it is not only my boat.
BMB