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Boat Repair/Compression for Mercury 45hp classic 50

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Expert: Jeff Grigg - 1/7/2008


Question
Hello I am looking to buy a 45hp Mercury classic 50 1987 model whith serial #OB179430. The compressions are for #1-150, #2-150, #3-147, and #4-142. Is this a good motor or will I have problems in the future. I do not know how may hours are on the motor. The guy said the motor runs,idle, and starts good. There is not water or shavings in the oil in the lower end unit and the carbs has been recently service. Is this a good buy or should I keep looking. Thanks

Answer
The compression is fine, a little off but that could be some carbon build up.
Run the motor and make sure it gets on plane easily and runs smooth, shifts smooth.
If you buy the motor run some Quickleen a carbon remover in your fuel and I would also recommend running some Power Tune a spray carbon remover. Both are Mercury products.
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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