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Boat Repair/1992 70hp Johnson
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Question
My outboard is having problems with ignition I have replaced all coils plugs and powerpack but it still wont rev past 2500 rpm and dies if I try to increase rpm. each time I have replaced a part it runs fine for about 5 minutes but the problem returns compressions are all at 120 could it be stator and if so what is the approx. cost of replacement parts
You could be having a problem in the fuel system or carbs as well.
The stator is under the flywheel and supplies the charging and the electricity to run the ignition.
Try this to diagnose the problem.
Run the motor with a timing light attached. Let the motor warm up. Then with the boat in the water, not on the hose, try to get on plane. Watch the timing light and see if you drop a cylinder. Do this on all three. It will tell you whether the problem is in the ignition or induction systems.
Once you find out please post back and we can go from there.
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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