Boat Repair/Rpm

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Expert: Jeff Grigg - 1/14/2008


Question
Do you know how many rpms a 1987 35hp force outboard motor has and were would be the best place to find a tach. I was told to test the rpm because the boat wont plane out runs good but very slow the boat is a 16ft. renegade fiberglass any other ideas are welcomed thanks.

Answer
Chris, yes you should have a tach, but it isn't absolutely necessary. If the boat won't plane out you have a different problem than how many rpm's the engine is turning unless the prop is bad.
If you seem to have an engine that will turn up but doesn't go anywhere have the prop's hub checked.
If it just doesn't seem to accelerate or you hit a flat spot, have the engine tested to find the real problem. For the price of a tach you could have the engine properly diagnosed.
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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