Results 1 to 8 of 8

Thread: A Prop to Jet question

  1. #1
    Member outaMT's Avatar
    Join Date
    Aug 2008
    Location
    MatSu
    Posts
    183

    Default A Prop to Jet question

    Hi All,
    First off a disclaimer: Iím not a jet guy---yet; please donít think Iím an idiot If Iíve missed something regarding my questions below.
    Iíll soon be moving to the last great state, so Iíve searched and re-searched this forum for months, learning as much as I can from you guys and gals about AK boating, fishing and hunting. Since reading your posts over these last months, Iíve also learned how you guys utilize the rivers and skinny water to get to some of the best hunting and fishing opportunities the land offers.
    I run a Weldcraft-188 Rebel; very versatile and well built. Iíll be fishing the lakes of course, and what I can safely get away with in the salt; typical prop and kicker applications that Iím already set up for. But I would also like to work the skinny water/rivers that a prop wouldnít safely clear. (Not looking to replace my lower end).
    Iím looking for info on a prop to jet conversion kit for a 115 Yamaha. From what Iíve been able to piece together from other posts and threads I think this is doableÖ? Iíve searched the net but canít seem to find any answers. Can you guys point me in the right direction? First off, can it be done? If so, whatís the cost? Can you easily swap from prop to jet/jet to prop depending on what application was needed? My apologies If this topic has been covered here before and I've missed it.
    If I can do Ďskinny daysí by just swapping prop for jet on the same boat, I think Iíd be able to splash just about anywhere (minus the KR and the 40hp regs). As always, thanks for the help!

  2. #2

    Default

    Basically the answer is, no. There is no quick and easy swap in the field or the garage from prop to jet.

    The lower end must be changed, that is the basic difference between jet and prop.

    When the jet unit is installed the shaft length changes which requires a transom height adapter; the entire engine must be raised on the transom.
    Controls have to be changed; the gear shift cable must be moved to the gate control. Not to mention swapping the bottom ends takes a little time.

    One thing to consider is that a jet can run anyplace a prop can but, a prop cannot go everyplace a jet can.

    As to converting your particular outboard I have no experience but, I am quite confident jet conversion kits are available for it.

  3. #3

    Smile

    Quote Originally Posted by outaMT View Post
    First off, can it be done? If so, whatís the cost? Can you easily swap from prop to jet/jet to prop depending on what application was needed?
    Yes.

    HydraulicTransom Jacks are around $600-800, manual jacks are $200-300. Transom extension (another option) $150-200. Shifter and throttle cables $200. So at minimum $350-400.

    Depends on your definition of easily. With a hydraulic transom jack and cable swap, it would take 45 min, or so.

    Contact Specialty Manufacturing Company in San Leandro California
    We never really grow up, we only learn
    how to act in public

  4. #4
    Moderator stid2677's Avatar
    Join Date
    Apr 2006
    Location
    Fairbanks Area
    Posts
    7,274

    Default

    I swap back and forth every year. It takes me about 45 minutes using a hyd jack plate. Here are a few links talking about it, including mine. Welcome to Alaska and enjoy.
    http://forums.outdoorsdirectory.com/...highlight=prop
    http://forums.outdoorsdirectory.com/...highlight=prop
    http://forums.outdoorsdirectory.com/...highlight=prop
    http://forums.outdoorsdirectory.com/...highlight=prop


    Good Luck

    Steve
    "I refuse to let the things I can't do stop me from doing the things I can"
    Founding Member
    http://www.residenthuntersofalaska.org/

  5. #5
    Moderator AKmud's Avatar
    Join Date
    Oct 2005
    Location
    Wasilla, Alaska, United States
    Posts
    3,185

    Thumbs up

    I've done it as well, we have a manual transom jack. It takes a bit of muscle compared to the hydraulic jack, but it works well. Once you get set up and know your measurements, you can change it out in less than an hour.

    This is the jack we have, the same company offers hydraulic as well - Transom Jack
    AKmud
    http://i78.photobucket.com/albums/j96/AKmud/213700RMK1-1.jpg


    The porcupine is a peacful animal yet God still thought it necessary to give him quills....

  6. #6

    Default

    If you set the engine/jet unit up correctly the first time you should be able to use a bay adapter to go to the prop lower unit whithout changing the engine height. http://www.baymfg.com/

    The CMC lifts also work but only have 5" of lift which is not enough. These lifts set the engine and jet foot back (3-4") from the transome and the bottom of the boat so the water coming into the foot is "soft" water. Most folks will add an extension between the transome and foot so the foot receives "hard" water. I used a combination of the bay adapter and lift for a 175 Hp Yamaha. The lift allows you to adjust the foot height for different water/boat loading conditions (choppy versus smooth water) which I really liked. Check out other lifts, supposedly there are some out there that go beyond 5".

  7. #7
    Moderator AKmud's Avatar
    Join Date
    Oct 2005
    Location
    Wasilla, Alaska, United States
    Posts
    3,185

    Default

    Quote Originally Posted by rhorn View Post
    The CMC lifts also work but only have 5" of lift which is not enough. These lifts set the engine and jet foot back (3-4") from the transome and the bottom of the boat so the water coming into the foot is "soft" water. Most folks will add an extension between the transome and foot so the foot receives "hard" water. I used a combination of the bay adapter and lift for a 175 Hp Yamaha. The lift allows you to adjust the foot height for different water/boat loading conditions (choppy versus smooth water) which I really liked. Check out other lifts, supposedly there are some out there that go beyond 5".
    Hmmm...5" was enough for our 115hp Johnson. We have it on a 17' Alumaweld. Having the motor set back hasn't been a problem so far. I have heard of some folks having cavitation issues in really sharp turns, but I haven't experienced any problems. In fact, once we got the height adjusted for the best performance, the foot is actually a little higher than the bottom of the boat due to the water coming up from behind the transom.
    AKmud
    http://i78.photobucket.com/albums/j96/AKmud/213700RMK1-1.jpg


    The porcupine is a peacful animal yet God still thought it necessary to give him quills....

  8. #8
    Member Akgramps's Avatar
    Join Date
    Apr 2008
    Location
    Last civilized place on the planet
    Posts
    2,078

    Default 7.5" of lift

    Power Trans makes a lift with 7.5 vertical travel, unfortunately it has 6" of setback, which could be a drawback for some? I think it would be Ok if the tunnel or the bottom of the boat was extended to match.
    PT said they are considering building one with a 4" setback, maybe sooner than later if more people requested it.

    http://www.powrtran.com/cgi-bin/cart...?parts_id=9662

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •