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Boat Repair/45 hp classic 50
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Question
I've been having trouble with rpm's and power. At idle can rev it up to 5000plus rpm but under load it seems like its losing a cylinder can only get 2500-3000 rpm. Sometimes it will kick in and away I go. Took it to a local shop, rebuilt carbs, new plugs and harness under stator. They gave up. Also it seems to run hot.
Steve, NEVER, EVER rev the engine up in neutral, you can only damage it.
First do a compression test of each cylinder. If it is getting hot it can make it run lean and score a cylinder or vaporize the fuel before it can ignite properly causing erratic behavior.
It sounds like your shop is just guessing. It is only a mechanical machine and can be repaired in most cases. Take it to a good reliable shop and have them check it out.
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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