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Engine Technical Discussion This is our non outboard engine related technical discussion forum. If your boat is powered by a Inboard/Outboard, Jet drive, V-drive, or even something else, then this is the forum for you! Topics include engine repair and maintenance, modifications, drives and gearcases, electrical and electronics, etc. For technical assistance related to outboards, please use our outboard tech forum.

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Old 03-31-2014, 12:54 AM   #1
boostscootinboogie
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Default Senator thru hull exhaust question

Hi I recently picked up a 89 senator. New to the checkmates and looking it get it back right best I can. Question is about the thru hull exhaust location. It has 350 mag in it and the rear swim platform that is one piece and humps in the middle. The exhaust is down low with flaps about the middle of transom. Is that factory position on that boat?

Above the water line same with as where the exhaust is now there are two holes up high but blocked by the swim platform by half. Holes there look like where the bb exhaust with two single platforms would come out. I want to put it back up high but keep the platform. I see the senators with the one piece platform and exhaust under the hump up high.

Want to know if anyone has good pics with the one piece platform and thru hull up high under it for placement. Also know if where it is now is right?
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Old 03-31-2014, 12:19 PM   #2
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Best photo I can do for now ( redboat in storage ) .


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Old 03-31-2014, 06:47 PM   #3
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Oh nice thanks so I guess mine is in the right spot then and someone must have moved it at one time then put it back. Haven't had the boat out yet but down where it is in that pic is it above and load or not as load as if it was up more?

Ps just sent you a pm before I seen this
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Old 04-01-2014, 04:36 AM   #4
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Model Owned: Checkmate convinsor 259-Checkmate senator MAG 350v8

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This is my senator,

http://youtu.be/NqjwTKCGSTI
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Old 04-01-2014, 04:42 AM   #5
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Model Owned: Checkmate convinsor 259-Checkmate senator MAG 350v8

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I like the set up als i have now because its in the water at slow speeds and out the water at mid and high speed. So in the docks its not loud and at higher speeds its going up on noise.
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Old 04-01-2014, 02:31 PM   #6
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Thanks sounds good. I haven't had mine in the water yet but I also have the 350. What pitch prob do you run and what's your speed and rpm? Think there's a stainless 23p on mine. No clue how it will go.
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Old 04-01-2014, 03:01 PM   #7
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I'm running a Hydromotive 4 blade 25 pitch . Speedo pegs with just me , 1/4 tank of gas , no beverages or any toys . But we all know the speedo's are never right .
My guess would be 70ish .Bought a GPS , so we'll see if the lake ever thaws out !

Your's being lighter with the small block should scoot .
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Old 04-01-2014, 03:30 PM   #8
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Model Owned: Checkmate convinsor 259-Checkmate senator MAG 350v8

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Quote:
Originally Posted by boostscootinboogie View Post
Thanks sounds good. I haven't had mine in the water yet but I also have the 350. What pitch prob do you run and what's your speed and rpm? Think there's a stainless 23p on mine. No clue how it will go.
ballistic 21. top is around 64.

topspeed is proberly not the best but i don't care for the last mile an hour.

it's the best for me in RPM. it is at 4500. the mirage i had was higher in rpm. did not want to close to max rpm.
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Old 04-01-2014, 03:45 PM   #9
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Cool thanks. For got how pitch works? Higher the number more top end and lower rpm it has? And lower pitch number more acceleration and less top end? Or do I have that backwards?
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Old 04-01-2014, 04:02 PM   #10
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Here' a YouTube video I took 6 years ago . I watch this all winter .
Old camera , first time video .
http://www.youtube.com/watch?v=eK7jwWYUJck
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