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Boat Repair/115 hp johnson
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Question
I have a 1978 115 hp Johnson v4. One weekend it worked great. One week later, the motor will rev up and the front of the boat will come up, but does not get enough speed to bring down the front of the boat. If you keep the gas wide open, the motor will slowly (4-5 minutes) pick up more rpm, and the front will slowly come down. Motor does not miss, and sounds good. Still will not pick up as much speed as it normally did.
I suspect you have an ignition problem. I would also check the fuel system and for carbon on the pistons. Running on three cylinders instead of 4 would be my first guess. Have your shop check it out.
Next time don't keep running the boat if there is an apparent problem. You could blow the engine leaving you with a big bill!
Jeff
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Jeff Grigg
Expertise
Can help with most any question related to outboards, high performance, hull repair, rigging, if it floats and uses a motor. From a 9.9 on a aluminum boat to DFI two strokes. Outboard motors are my specialty. I can help with some I/O questions as well. Ratings are the only way we know if we are helping. If you are pleased with the help, please rate us. 20% don't bother reading my answers! If you are not going to read the follow up then why ask? Keep in mind we do this at no charge and are not paid. We do it to help you!
Experience
32 years in the marine business. Own a service facility, in coastal South Carolina certified Master Tech by Johnson/Evinrude, certified Mercury/Force, Tohatsu/Nissan. Former technical director for DMI Pistons. 30 year racing career including 3 APBA Formula V National Championships
Organizations
AMTECH, APBA
Publications Written For
Boat & Motor Dealer, Car Classics, Custom Vans (tech articles), Miami News, powerboat racing column
Awards and Honors
Certified Master Technician Johnson/Evinrude
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