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Merc
2.4 Motor Mods
Randy,
It's great to have such a knowledgeable resource and addition to the
already wonderful I.H.R. I entered the world of performance boating
the summer of 2000 with a purchase of a 1990 Vegas XT. The motor is
a stock 1990 Merc 200 Black Max with 6" set back, and it's turning a
14-1/4 x 27 Mazco. Coincidently, I store the boat in Richmond, MN,
and I sometimes frequent the Sauk River.
The original power head blew in 1994 and was replaced with a new power
head (#813043A89) that same year. First, based on the part number, can you
tell me if there are any notable differences between the newer power head
and the one it replaced? Second, I would like to start having some
minor motor modifications done. What types of beginner
mods would you suggest a guy like me start with?
Ryan Hallesy
Plymouth, MN
Ryan,
If your boat is white with blues and a black tail, I know the boat. Your
new powerhead is basically the same with some piston and rod updates.
First thing would be make sure it has solid mounts. That motor likes a
little more compression. A set of Boyesen reeds of the rubber coated type
should be on the shopping list. I'd get rid of all the advance/retard
modules and run 25 degrees of timing. Chucking the oil injection would be
wise if you can live without it. I'd pull the liner and change the pipe to
a 41941 exhaust tuner. I'd leave the center stock and not drill the
exhaust relief holes as they just make noise and no power gain. You would
kind of end up with a homemade promax. On a Vegas that should get you past
80. Drop by sometime if you want. We have a hotboat club that has a few
rallies on Gull and Whitefish lakes. It would be great to see you there.
Mostly just general boating and relaxing fun with up to 45 other boaters.
Sometimes I bring a bunch of props to try for people to experiment.
Hope this helps and hope to
see you.
Randy
Please submit
whatever questions you have to IHRTechTalk@yahoo.com.
All questions and answers selected will be displayed on this page as they
come in. Note: though all boaters are welcome, priority may be given to
I.H.R.
members. Randy can not be held responsible for any advice
given. Though his information and expertise is second to none, he
has no control over what you do with your boat. It is up to you to
boat safely and act responsibly, and his advice is only to be used as a
guidance for your high performance boat/motor of which you are the one
responsible for the risks involved.
Thanks,
Mark C.
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