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Old 08-02-2015, 10:28 PM
barefootjoe barefootjoe is offline
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Join Date: Jan 2010
Boat: 1980 stars n stripes Orig 351 pcm engine ++
Location: northeast
Posts: 57
90's Tristar into outboard-MC Prototype? Restoration

So, according to the guy who sold this to me in AZ this was a mastercraft prototype before he had it. I never confirmed this, but it does not have any holes for prop or rudder in the hull, no supports for an inboard engine. It appears to be a tristar conversion. When I purchased it the poorly welded jack box sitting on top of the swim step had failed and all that was left was some shredded outboard connections. I picked up a 1990 Yamaha 250 in Louisiana on my way back to PA.

Here is where I am at so far.
Had the jack plate re-welded and strengthened, and then I drilled and bolted it at all critical spots so that will not fail again.
Mounted the 250 on the back, installed the controls and took it for a test run.
It was very tail heavy and drove like a drift car/jet boat - (didn't turn until the prop overcame the turned hull.)
I have welded up a frame between the stringers and installed two tracking fins in similar fashion to my ski centurion barefoot warrior outboard- roughly 2/5ths forward from the back.
Once the 3M sealer is cured I will be taking it for another test run, and bringing 5 gallon buckets of water to place in the nose. I plan on testing it with various weights in the front to find the optimum balance and then installing ballast tanks in the front for the future.

? Does anyone have suggestions on best method of filling/draining ballast tanks? I have several different tanks from old campers that I can use, just need to set up pumps or intakes or whatever.

? Anyone had a similar set up? I am wondering if this will allow me to turn and control well enough or if I will need to install an actual rudder like an inboard as well? (not sure how I would combine that with the hydrolic steering)

Questions? ask away, I will try to post pics later.
Who reads posts? I just look at the pictures.
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Old 08-02-2015, 10:31 PM
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aquaman aquaman is offline
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Join Date: Jun 2010
Boat: 93 Barefoot 200 Yamaha 225F
Location: At the Helm
Posts: 1,335
I think pics are necessary on this one?
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Old 08-02-2015, 11:46 PM
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BrianM BrianM is offline
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Join Date: Jul 2004
Boat: 1988 Prostar 190
Location: Mandeville, LA
Posts: 5,079

1997 Prostar 190, TBI 350, 1:1, OJ XMP 13 x 11.5, Stargazer, Hot Shower, Heated Drivers Seat, Reuben/Mountain Rock/Nite Navy

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Old 08-06-2015, 12:51 AM
lcgordon711 lcgordon711 is offline
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Join Date: Jul 2015
Boat: 1994 American skier TBX
Location: Rockys
Posts: 269
bump for pics
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Old 08-06-2015, 01:31 AM
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thatsmrmastercraft thatsmrmastercraft is offline
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Join Date: Sep 2008
Boat: 1977 Stars & Stripes
Location: St. Paul, MN
Posts: 17,523
Originally Posted by aquaman View Post
I think pics are necessary on this one?


Email - [email protected]
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Old 08-07-2015, 12:38 AM
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pbgbottle pbgbottle is offline
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Join Date: Oct 2011
Boat: 1988 tristar 190
Location: Cloverdale B.C. Canada
Posts: 414
bump hhh

1988 mastercraft tristar (open bow).
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ballast system, outboard, restoration, tristar

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