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Boat Repair/Merc. 20hp and 25hp

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Expert: Jeff Grigg - 1/8/2008


Question
Jeff, I have been told that the only difference between the merc 20hp and 25hp(two stroke)engines is the carburator.  Is this correct.  I have found a great deal on a 1998 model 20hp mercury, but really wanted a 25hp.  Can I convert this to 25hp fairly cheap?
Thanks,
Kris

Answer
The 20 and 25 used different carbs, so by replacing the carb with one from a 25 and redoing the linkage you should be able to do it. I don't know of any other differences. That is assuming you get a carb from the same year. The 20 carb was a WMC 52 and the 25 carb a WMC 53A. Your problem is finding a carb.
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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