Question about Yamaha Boating
My 1999 Yamaha XL1200 limited waverunner runs strong for about 15 minutes. During this time it has good throttle response and good speed (about 57mph), but after about 15 minutes it starts to bog down. It idles fine, but when you give it gas it starts to go, but immediatly loses power and bogs down. I have to creep back to the dock. It already has an exhaust temperature bypass module installed and I don't see any error displays on the instrument panel. Please help. Thanks!!
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Posted on Jan 02, 2017
SOURCE: I have a 2001 Yamaha
Several things can cause the problems you describe. 1) If there is a mouse nest in your waterbox, adding water to the nest plugs the exhaust causing the poor running. When it drys out on land it runs fine. Cleaning out the water box will not be easy on that model but a careful inspection of the exhaust outlet may tell if critters are the cause of your problems. 2) Corrosion in the teeter/totter needle inside the carburetor can also cause low power on the water. Try cleaning the carburetor. Warning: be very careful not to modify or stretch the spring on the teeter/totter. 3) Water in the electronics box can cause shorting and low power. Open the electronics box and inspect it for moisture. Leave it open over night to dry it out and put grease on the o-ring seal when reinstalling the cover. 4) One last possibility would be burnt or stripped screw on tops on the the spark plugs (if they are not solid top plugs), fouled spark plugs, or burnt out resisters in the in the spark plug caps. Replace the plugs ($3 each) and the spark plug resister caps($5-$8 each), make sure the screw on domes of the plugs are on tight. with any luck one of these checks should fix the problem you describe.
Posted on Aug 29, 2011
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