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Boat Repair/Loss of RPMs
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Question
Jeff:
I own a 130 Yamaha 2 stroke with about 150 hrs on it. Last summer, it started dropping RMPs (throttle set to 5500 but the motor would drop to 2000 then kick back in to 5500 then drop off to 2000 and so on). Quite Frustrating. It will run fine for 20-30 minutes then start to drop off as described above. I suspect that it is something electrical - which scare me. Any thoughts to the problem???
Could be a number of things, but I would suspect either the power pack or stator. Both store or create electricity and do heat up which can cause a failure. An ignition coil can do the same thing.
Have it diagnoses properly at a good service shop. You will save money in the long run.
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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