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40hp input

Discussion in 'Boats, Blinds, & Gadgets Forum' started by cory_09, Aug 15, 2013.

  1. cory_09

    cory_09 Refuge Member

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    Lexington KY
    I am considering the purchase of a 2006 Mercury 40hp 4-stroke. It will be placed on a 1648 hull. Any input on the performance of this particular engine would be greatly appreciated.

    Thanks,

    Cory
     
  2. Sitndux

    Sitndux Refuge Member

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    I run a 40 on my 1650 and love it, as long as you have trim and tilt.
     

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  3. JBurns

    JBurns New Member

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    I've got a 99 4 stroke 40hp on my Lowe 1648 and loaded down pull 32 on GPS with a stainless 14P propl
     
  4. 1995 US1

    1995 US1 Moderator Sponsor Moderator

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    Which 40hp 4 stroke is it, the EFI or carbbed model. I tested the carbbed model and I own an EFI model. I own 2 EFI Mercury 4 strokes and will never own another carbbed motor. I have the 3 cylinder 40hp 4 stroke on an 1844 marsh tunnel. It is a little beast. I have it under propped because we usually carry 4 men, dog, hunting gear in a shallow marsh. We need to get on plane quickly. It will push that load near 30mph, stays on the 6250 rpm rev limiter with 2 men and gear. It has been bulletproof.
    D
     
  5. Turdrocket

    Turdrocket Refuge Member

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    Certain 40 Merc four strokes are a beast with proper setup and the ecu flashed. I run a 40 2 stroke and it has plenty of power and top speed but its not a stock run of the mill motor. I'm guessing that 2006 has a Bigfoot gear case?
     
  6. 1995 US1

    1995 US1 Moderator Sponsor Moderator

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    The only 40hp Merc 4 stroke that can be re-flashed to a higher horsepower is the 4 cylinder 61 cubic incher that comes only with a bigfoot gear case. The standard 40 Merc 4 stroke EFI, 3 cylinder, 45 cubic inch motor has a 2:00/1 gear ratio and cannot be re-flashed to anything larger.
    I own one of each. I have replaced the gear case on the 4 cylinder with a gear case from a 50hp 4 stroke merc and installed a 60hp ecu in the motor. It produces 64hp at 6249 rpm. It makes more horsepower than any stock 2 stroke merc 40 with 60 attachments we have dynoed to date. The most we have ever seen with a 40 merc with 60 attachments is 59hp.

    D
     
  7. gundog05

    gundog05 Senior Refuge Member

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    Never heard of the re-flash deal... on older motors I had seen and heard of guys changing out the carbs to get it a boost in power, but first I have heard of the flashing deal..... What exactly are the requirements on doing this?? I have an 04 Merc 25 Bigfoot with tilt/trim, but not sure if it is carbed or EFI... Just got the boat, but would be interested in seeing if this is a possible boost in motor performance for the 25.
     
  8. Nelliboy2

    Nelliboy2 Elite Refuge Member

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    I have a 40hp four stroke merc tiller with trim I'll sell you. 2007 60-70 hours on it. Pm if your interested.
     
  9. 1995 US1

    1995 US1 Moderator Sponsor Moderator

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    First, it is not available on your 25, it is what it is.
    This is not new, it has been done for years. Since ECU programming came to outboards, we have played with the programming.We did it with automobiles for decades, ever hear of "Superchips", they do the same thing with automobiles. This is not available with the 3 cylinder 40hp 4 stroke mercs. The Mercury 4 stroke, 4 cylinder, 40/50/60 use the same block, injectors, everything but ecu program. The 40hp 4 cylinder is available only with the bigfoot gearcase, the 50/60 comes with either standard or bigfoot.
    Just as with any modern automobile, the ecu (Engine Control Unit) can be reflashed with a different program. The 40 and 50hp, 4 cylinder Mercs can be reflashed with the 60hp program. Mine makes 64hp at 6250rpm.


    http://simonmotorsports.com/
    D
     
  10. cory_09

    cory_09 Refuge Member

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    Location:
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    It is the carbbed motor.....no EFI and not the Bigfoot edition. It seems that this is not the most desirable model??

    The current owner says he gets about 30 mph on a riveted Alumacraft 1648. Seems a little sluggish to me?
     

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