Have a 25 HP Mercury outboard on a 17 foot stick-steer Bass Tracker. It starts easily and Idles smoothly,but when I hit approx 1/2 throttle, it is like it starts running on only 1 cylinder and won't rev past that point. I have cleaned the carb,replaced the pump diaphrams,have new fuel/oil mix,new plugs(surface gap)and the compression is approx 130 psi on both cylinders. I am quite used to working with small engines and motorcycles but I just dont know what else to do or adjust! I know that the engine needs to be in water and have a load on it to be able to adjust it correctly but it is a big "PAIN" to have to keep taking it to the lake. I run it on dry land with the water adapter on it, but no load. Please help with any suggestions for adjustments or settings and get this old man on the water again...lol ;-} Thanks in advance!
2007-07-22 15:51:42 · 8 answers · asked by tooldaddy2003 5 in Cars & Transportation ➔ Boats & Boating
I don't think your problem is an "adjustment". I think you electronic module is breaking down at a certain RPM and the only way to fix that is to replace it.
Your best bet is to take it to a mechanic that has a tester to test the electronic module/s. Good luck. Pops
2007-07-22 15:57:57 · answer #1 · answered by Pops 6 · 0⤊ 0⤋
Sounds like water in your fuel or auto advance is stuck.You can put the motor in a drum of water at the stern if you want to put a load on it.IF it only does it when it's hot it could be head gasket
2007-07-22 19:14:22 · answer #2 · answered by max k 2 · 0⤊ 0⤋
Don't forget the old "fake-a-lake" method of running it in a garbage can full of water. Not the same as running it in the lake but you an get some load on it.
2007-07-22 16:11:25 · answer #3 · answered by ogrebonz 2 · 0⤊ 0⤋
Still sounds like a fuel problem try keeping pressure on the fuel bulb while running?
2007-07-23 02:05:02 · answer #4 · answered by 45 auto 7 · 0⤊ 0⤋
HI, Alot of good answers, but if all else fails have a marine shop do a pressure test on your tank & supply line, or just use someone elses tank & line off a good runner to test. If I saw you having trouble I'd sure let you use mine. Good luck
2007-07-23 01:51:09 · answer #5 · answered by kensethfan 1 · 0⤊ 0⤋
Sounds like a coil to me. Or maybe the timing advance.
2007-07-22 17:36:55 · answer #6 · answered by Anonymous · 0⤊ 0⤋
remove the exhaust cover and inspect the pistons. that engine has a history of burning them.
2007-07-23 02:23:54 · answer #7 · answered by Anonymous · 0⤊ 0⤋
check fuel diaphragm pump, they get pin holes in them.
2007-07-22 22:11:43 · answer #8 · answered by Anonymous · 0⤊ 0⤋