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Old 06-23-2014, 09:16 AM
Jerseydave's Avatar
Jerseydave Jerseydave is offline
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Join Date: Jul 2004
Boat: 2005 X-STAR & 1993 Prostar 190 Limited
Location: Jersey
Posts: 5,541
Originally Posted by jakethebt View Post
Mine are still there too. Any idea what plugs should be used?
Hardware store, get 1/4 NPT pipe thread plugs. Use Teflon tape on the treads.
I was njskier on here.
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Old 06-23-2014, 09:37 AM
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mgs96ps mgs96ps is offline
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Join Date: Mar 2013
Boat: 96 ProStar 190 LT1
Location: Midwest
Posts: 646
MC serive bulletin says to cap off existing steam tube. One banjo bolt has easy access, the other not so much. Most likely will end up capping off at rearof heads...but may just plumb steam tube in since it is still good.
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Old 08-30-2014, 01:29 PM
whiteoak whiteoak is offline
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Join Date: Aug 2014
Boat: Mastercraft, Prostar 205,1997, LT1
Location: Midwest
Posts: 1

I have a 97 prostar 205 with the LT1 engine. My brother-in-law used it last week and had a hose fail, engine over heated, melted the air cleaner off and melted the wires to the starter. I have not been able to get to see the damage yet but I assume the heads will be warped and I will need new wiring and etc. My question would be that the boat is sitting up in the Rocky Mountains and I want someone good to look at the motor. Who in the Denver or Rocky Mountain area would be qualified to get it fixed correctly? I am open to suggestions!
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Old 08-30-2014, 02:12 PM
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mikeg205 mikeg205 is offline
Join Date: Aug 2011
Boat: 1995 Pro Star 205 5.7 Liter
Location: Plainfield - Joliet, IL
Posts: 12,730
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Dealer in Denver.... http://www.swperformancemarine.com/2012_website_004.htm

towboat captain here knows this dealer...

So sorry to read this.... melted? yah... The motor toast sorry - IMO -
...A bad day water skiing still beats a good day at work...1995 Pro Star 205....
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Old 08-31-2014, 12:22 PM
manowicki manowicki is offline
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Join Date: Apr 2013
Boat: MC PS 190, 1993, LT1
Location: rky mtns
Posts: 20
Sorry to hear about the melt down. In my experience SW Performance has been EXTREMELY unhelpful with vintage products. YES, even their own (MC). They have told me in so many words, that they want NOTHING to do with my 93 in trying to get parts etc....

Tommy's Slalom Shop does not sell MC anymore. However, they are still an Indmar dealer. They will in fact at least try and help you and thats where I go.

With the current lack of support from MC and Indmar and considering the fact that there is little to no support for the early MEFI units, I am planning at some point going down to AZ to have these guys update ALL the wiring and convert to MEFI 4B. Its either that or do the GM conversion to carb and distributor (all parts available) if and when the ECU fails...... If the meltdown has extensive damge to the harness and ECU, its may be the big decision time
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Old 08-31-2014, 12:23 PM
manowicki manowicki is offline
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Join Date: Apr 2013
Boat: MC PS 190, 1993, LT1
Location: rky mtns
Posts: 20
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Old 05-03-2015, 09:04 PM
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LotusV8 LotusV8 is offline
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Join Date: Jun 2012
Boat: 1997 Maristar 225 VRS
Location: Lake Allatoona
Posts: 29
Originally Posted by mgs96ps View Post
Finally doing the LT1 cooling fix. It seems to me that my boat maintains the 160 temp but I have decided put vents at the front of heads for good measure. I will be leaving the stock vent tube at the rear and capping off the tube running toward bow. Has anyone, instead of capping off existing tube, just plumbed it into new hardware on front? That way steam could travel the least path of resistance and escape either toward the front or rear. Overkill?
Attached are some pictures of hardware.


My 1997 225V LT-1 started running up into the 200 degree range during idle and no wake areas yesterday, if I accelerated the temp would quickly drop to 170 degrees.
I checked to see if the LT1 cooling fix had been done after seeing this post and it had not.
I made the update today with all your detailed information including the posted TSB.'
Took it out for a lake test this afternoon.....165 degrees at all speeds!

I could not believe the instant change this "Fix" made and I would not have ever figured it out if not for this great forum and the dedicated members.

Thank you all for your help!

I hope I can be as helpful to you in return sometime.

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