90 Mercury Sport Jet Advice

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myartnmotion

Recruit
Joined
Dec 20, 2010
Messages
4
This Granny has a jet boat on my bucketlist..so found a 94 Dynasty Jet Storm/Trailer/New Jet Pump but has bad motor and all electrical components are gone so did pick it up cheap.....I am torn with rebuilding the 90 Merc Sport Jet power head or selling the New Jet pump to help convert boat to outboard..
have body work and welding experience...please advise or should I get the motor rebuilt? I see it going either way but I will be using boat mainly to cruise in creeks and go to alot of springs to gather with friends here in florida I am worried of sucking up sand and debri in shallow areas whereas outboard tilt and trim might be better?????
 

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Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,938
Re: 90 Mercury Sport Jet Advice

Junk it out,reinforce the transom,install a jackplate and 60hp. Only bad thing about a jet is if you get in less an 2ft of water it starts sucking debris(sticks,rocks,cans,bottles) off the bottom thru the pump...
 
M

myartnmotion

Recruit
Joined
Dec 20, 2010
Messages
4
Re: 90 Mercury Sport Jet Advice

Thanks ..I so wanted to play with the jet setup but my gut instinct was saying no...well then..gotta new jet pump for sale lol...fiberglass work and welder here I come. Thanks for the sound advice...Merry Christmas guys
 
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myartnmotion

Recruit
Joined
Dec 20, 2010
Messages
4
Re: 90 Mercury Sport Jet Advice

Granma will be back to give an update I'll be doing the work myself eeek...:eek:
 
S

stormmn

Seaman Apprentice
Joined
Oct 31, 2010
Messages
34
Re: 90 Mercury Sport Jet Advice

faztbullet..

In reading your comment about "jet pumps" I would like to comment that I have ran both inboard and outboard jets for over 30yrs. on many small rivers in Oregon and have never collected a can, bottle, stick or other debris when on plane. I have ran many times in water as low as 8 inches and bent a few shoes, but that's my stupidity.
The only problem is when shutting down, you must be in at least a couple feet of water.
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,938
Re: 90 Mercury Sport Jet Advice

I too have ran jets and having a 2" stick stuck on your loader at 100 mph is uncontrolable. I used to drag race in the KDBA with a 16 ft texas tunnel,american turbine jet, "c" cut impeller, 454 bored .100 to 505ci, t2xtunnel ram,twin 1050 holleys,nitrated crank,etc,etc,$$$... Like you said, rarely at plane but idling and planing in shallow water tears impellers and grates to h***. What usually happens is boat is beached,shoved off and reverse gate is dropped and engine reved up to back up and this blows all the debis off bottom and into intake..
 
M

myartnmotion

Recruit
Joined
Dec 20, 2010
Messages
4
Re: 90 Mercury Sport Jet Advice

Well I bought the boat and trailer for $250..I can atleast sell or trade the Jet Drive to go towards another OB lol
..Hope you Santa Babies had a wonderful Christmas
 
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