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Thread: # 4 speedmaster longevity ...

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    Default # 4 speedmaster longevity ...

    does any one know how long a number 4 speedmaster will last on a pleasure boat , im wanting to put one on my mirage and run it up and down the river on the summer weekends ... i heard that they should be gone thru and looked at , every 5 hours , the gears would have to be replaced at 10 hrs, along with the drive shaft? . is the rebuild really $3000 with the cost of parts and labor every 10 hrs? i also heard that you should change the oil everytime out .........

    any info would be great . im not gonna race it , but i will stretch it out a few times over 8000.

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    Sam Cullis Mark75H's Avatar
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    Parker, a lot depends on how much horsepower you are going to be running thru it. At 200 hp, it will last a lot longer than the intervals you quoted ... other than oil change with each use. The more power you use, the shorter time the gears will last.

    The amount of metal you see with each oil change will tell you how long the gears are lasting.
    Since 1925, about 150 different racing outboards have been made.


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    i was gonna just run my 280 ... i would think they would last more than 10 hours ? and whats the deal with the drive shafts and gears wearing out ? i can get 200 hours out of a sportmaster....

    it just doesnt make much sence to get rid of my sportmaster , to gat a speedmaster gain 7 to 10 mph , and have to rebuild it every 10 hours

    saam- u think it would go 50 hours?

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    Team Member jimclauss's Avatar
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    what kind of #4 is that.. for a outboard? or IO the #3,4,5, are bullet proof on IO.s

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    no were talking outboard
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    Team Member 88workcar's Avatar
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    one more factor is the weight of the whole rig, more weight less time.
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    my boat weighs about 750 pounds . what do u think ? plus me , gas cooler , prob 1200 by then .
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    Depending on your electrics system you may need to get one of the Opti 120 gearcases that is a #4 that has a bull gear in it to maintain your 280 RH powerhead rotation.

    If you switched it over to the traditional electrics (300 Drag / S3000 / 260 ) then you can run the powerhead LH.

    You may want to factor this into your decision as the case did not appear to be advertised as one of those. Most of the speedmasters out there are setup to run left hand propellers.

    I worked w/ a couple guys who did the exact same thing with a STV built boats. Propeller selection is a nightmare for the boats. You're going to need some LARGE LARGE diameter propellers to try to hold that boat up.

    Good luck on your project!

    Brian

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    brian- the unit is already turing right hand , brendan powers did the work on it ,it has the extended drive shaft and the edaptor , to convert to a 15 inch mid.... the prop that come with the unit is a 12x22 right hand done by b blades..... this #4 wasd ran on a vey light stv , with one person in it , im gonna try and run with 2 people and a heavier boat ? the owner is gonna let me try it before i buy it .

    just dont know if i wanna fork over a good sportmaster , plus cash to have a lower unit , i have to go into every 10 hours of just cruzing .

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    you think it will have enuff diamiter to lift the bow up ?

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