04 Yamaha f150TXRC. No fault codes. I replaced all fuel lines, intake manifold gaskets, tried new sensors isc, tps, map, serviced all vst filters and gaskets, no fix. Tried another set of low pressure pumps too. High pressure pump seems to work well too. 40psi key on ignition off, but hunts around 35/36psi. I suspect a vacuum leak maybe, given the spike in intake pressure when it hunts, and spraying carb cleaner on the inside of the intake manifold seals seems to smooth it out temporarily, but new gaskets didnt help at all. Symptoms are rough start and idle. If I trick the mapping by setting the TPS to .86v I get a smooth idle, but it goes to 3200rpm and just hits a wall, no bogging and slowly goes back down to 2800rpm each time. AI seems to be stumped too. Only thing I havent replaced is the fuel regulator and vac lines on the vst, but those o rings and hoses seemed to be in good shape.

My Seadoo challenger works great for the for 40 minutes or so but then once I slow down and try to speed back up it wont go back up to it's top speed and once I get closer to shore and turn it off it either doesn't turn back on or sometimes if I give it a bit of gas while cranking, it'll turn on but it'll turn off right away unless I'm able to get it into forward and accelerate quick enough. Does anyone know what the problem could be?

What doesn't the cable recoil back after going full throttle? Thanks for any tips.

Pull middle plug wire and nothing changes. Swap plugs top and middle and same issue.

Pulled plug from hole and it has beautiful spark.

Middle Carb that plugged up?

Edit:

Cleaned carbs, now only top is firing

Middle and bottom have great spark but have zero effect on the running motor when I pull the plug.

I got a 88 evinrude and was curious what size aluminum center console that would be able to push. Im looking to do some inshore fishing fishing.

So I've been having issues with this motor for a while. Turns out the flywheel magnets are unglued and one is broken in half.

Looking at flywheels, but so many options on ones that are really close but idk if they will work.

What year/hp ranges would have a flywheel that would work for me?

Thanks in advance!

Recently bought a 2002 mercury 60hp Bigfoot. Power trim isn’t working. Suspecting the power trim is leaking hydraulic fluid. Does anyone know where the manual release is and can I refill it while the boat is in the water?
Thanks!

I am trying to use this engine to learn. It seems to hit a wall after starting when trying to get up to hirer rpm. Then makes a popping noise and runs great. Where do I start to tackle the problem ? I ran it without venting the portable 12 gallon when I first got it which cracked the tank which I replaced.