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1995 Speedster with cavitation on starboard side

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Bigmantony

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The Boat engine holds 4000 RPM for about 20 seconds then jumps to 7000 RPM, after backing off throttle it try to garb again. I can plane but I'm using the port engine to do most of the work. I can get to 50 MPH with more throttles available. Now as far as what I've check. Gap between impeller and wear ring is less then .502mm .020 in. The wear ring looks new. I can't find any scratches and impeller has no dents, bur or damage at all. The shaft seal I'm not sure how to test. I did check the inlet, nothing blocking anything. The only thing I see is that a little bit of black seal material missing between the pump housing. (this is located at the front of the pump. white plastic piece.) If there is somewhere else I should look please let me know. Also one of the main bolts that hold the pump to the hull was loose. Thank You
 
Have you used this boat before without having these issues, or has it always done this as long as you have ridden it? My 95 performs similarly to what you are describing, but it's normal. On the 95 speedster, they only had 1 intake grate, which then "Y's" of to each pump inlet. Due to this setup, they used 2 DIFFERENT impellers. Port for "low end" and the starboard for "top end" (unlike our later dual-intake grate brothers that use the same spec impeller in each pump). That being said, the port engine does most of the work until (or until right before) you plane. Then the starboard impeller gets to work. In the end, they both work together to maintain top speed. On mine, if I plan to go full throttle (and don't want the engines just red-lining and cavitating the whole time), then I accelerate both throttles to about 3,500 MAYBE up to 4K and then I ease into the port throttle until I feel the boat about to plane (by then I am reaching maximum throttle on the port engine). Assuming you have a good "hook-up" (ie wear ring, impeller, seals, etc.) then you probably won't be red-lining yet on the port engine. I then start easing into the starboard throttle (which should have been starting around 4K from earlier). By now you should have already planed, and should be dramatically picking up speed. I drove a newer 4TEC S/C Speedster the other day and it was weird to not have a "step-by-step" process just to GO. On that one.....You just throttle and hang on!! I like my little Doo, but the whole setup was kinda dumb. Oh well, they seemed like they made quite a bit of improvement with each new model. Let me know if that helps, or if anyone else has anything to add. Be Blessed!!
 
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Check jet pump and found something very intesting. Ok. Got pump off. First problem no gasket between pump and hull. Second problem one of the hull bolts was loose. Third problem wrong prop for left side of boat, as a matter of fact wrong prop for boat. Replace wear ring and install 271-000-401 prop. Purchase new gasket for hull. Also I couldn't find a part number on old impeller. Also just purchase boat.
 
Well, I always like it when you FIND a problem. I don't mean that in a bad way. I just mean that I hate it when you pull something apart looking for a problem, and you don't find one. At least you found something. I replaced my "hull-thru" fittings and both "shaft bearing/seal carriers", resealed everything and it made an incredible difference. Still of course not as good as a new boat, but for the flawed 95, a wonderful difference. I ordered new Solas Impellers PN SD-SC-A and SD-SC-B's today. We'll see how they compare. Hope you get yours all back together and find a difference =)
 
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