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Old 07-16-2014, 01:18 AM
master.mike master.mike is offline
TT Newbie
Join Date: Mar 2010
Boat: 91' TriStar 220
Location: Texas
Posts: 17
Carb Question, Belt Tightness, and Alternator

So currently my boat runs fine, at least to me. I did some video and just wanted to get a second set of eyes and ears. I think I need to replace my alternator, as I have an idea its a automotive, not marine type. I have ordered a replacement belt and impeller. Haven't had any impeller issues, but just preventive maint. The belt squeaks a bit, but I think its partly due to being lose and also being old. Its at least 4 years old and I would imagine not marine grade from the looks.

Pulley's in Action.
Tighten pulley by moving alternator? Also considering replacing the alternator. It seems to have white corrosion on it after some time and runs pretty hot to the touch.

Holley Carb
Are two of the areas on the carb suppose to look un utilized? orhave i not unleashed the full power of my engine? Any recommendations? I think it need a bit of cleaning. I have B12 Carb cleaner I have sprayed around and some seafoam in the fuel tank for my run this weekend.

Thanks in advance!
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Old 07-17-2014, 09:42 AM
catamount catamount is offline
MC Fanatic
Join Date: Feb 2012
Boat: 1987 ProStar 190
Location: Vermont
Posts: 500
Yes, your belt is way too loose. You tighten it by moving the alternator. Sounds like you're on your way to getting that fixed.

I have no idea what you mean by the "two areas look un-utilitzed". Are you talking about the two barrels behind the choke plate that you're moving? That's your secondary and it only opens when the motor is under a load. It will never open in your driveway.
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Old 07-17-2014, 10:34 AM
slushpup's Avatar
slushpup slushpup is offline
TT Regular
Join Date: May 2008
Boat: 89 tristar
Location: northeast
Posts: 50
Yup belt is loose as sin. Unless you have cash to burn I would tighten or replace it. not the alternator.IMHO I would spend the money on a carb rebuild....its filthy.the capped port is probly a overflow for the fuel pump. but your pump dumps in the spark aresstor.
extreme tube tower
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Old 07-17-2014, 12:03 PM
east tx skier's Avatar
east tx skier east tx skier is offline
MC Hero
Join Date: Jul 2004
Boat: 1998 Ski Nautique
Location: End of my rope.
Posts: 26,185
On my boat, different marinization, but same setup, you want to get about 1/4" of travel on the belt (push down on the belt and it moves 1/4") when it's tightened.
Previous: 1993 Prostar 205

Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.


Be kind. Have fun.
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Old 07-17-2014, 12:28 PM
mayo93prostar mayo93prostar is offline
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Join Date: Dec 2004
Boat: 1993 Prostar 190 Blue Stars and Stripes, Powerslot
Location: Annapolis, MD
Posts: 809
the two barrels to the rear are the secondaries activated by vacuum. they tend to get corroded like yours. you can see if the secondaries open by (with engine off) engaging the throttle on the side of the carb and then manually rotating the secondary butterfly by pulling/pushing on the lever under the diaghram on the right side of the carb. there is a mechanical interlock such that you cannot rotate the secondary butterfly unless the primary is engaged a certain amount. I agree you need to clean it up, likely rebuild it, but if it runs, run it.
1993 Blue Stars and Stripes Prostar Powerslot 351HO
Mastercraft: Face It - If you are not a good skier behind this boat, you are not a good skier.
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