mini berkeley jet drive???
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mini berkeley jet drive???

  1. #1
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    Default mini berkeley jet drive???

    okay guys, i'm a newbie to this forum! i'm 22 years old, and i am getting started on my first real build on a boat. i'm pretty excited about it, and i have been doing a bunch of research, and i have come up with what i think is the best idea for my build. i absolutely love the look of the eliminator daytona 25's, but i simply don't have the space to store one


    so i found an alternative, and that was my little 10ft cougar cub mini cat that i picked up off craigslist for $300!!


    i love the hull design and how they sit in the water, and the over all construction of the boat. it looks like a really nicely built little boat, however...... i hate the way it looked with an outboard hanging off the back of it. so my original plan was to do a jetski engine and pump under it, like lilwake did on his addictor, but unfortuneatly i simply do not have the real estate between the back of the seat, and the transom to do something like that.


    i have been hunting around and i found a guy who took a 12ft wooden boat and did basically a pod drive outboard stuffed in the back of his boat which was super cool and clean, but i really like the jet idea better.



    so through hunting around for small jet drive units i found a thread (on this forum) from 08' ish about the berkeley 5J5 and 6J models, and they look absolutely awesome! but i understand that they are no longer being made, i belive the last production was in the late 60's for them if i am not mistaken??? i found a guy locally who has one in a 10ft aluminum duck boat that he wants $900 for, but that seems a little spendy for something i'm just going to cut up.

    i also saw they these pumps came in 6x6 atv's back in the day aswell????


    anyways long story short, i am looking for one of these jet drives, and looking for as much info about them as i can gather.




    any help finding one would be much appreciated!!!!
    Cougar Cub mini cat 10
    complete overhaul in progress / inboard jet conversion


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  3. #2
    21 Daytona Outlaw's Avatar
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    use a jet ski drive and mount the engine up front
    #55

  4. #3
    Senior Member bartel's Avatar
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    the mini berk allows for way more room than a jet ski pump does. I am currently building a mini as well with the mini berk 6j pump.

    what i know about the pumps so far. They can handle about 75hp max due to the diameter of the pump itself. I found a company that will do a custom stainless impellor for that mini berk. I got one in a 21 degree pitch and i plan on bolting it to a 700cc yamaha motor that puts out around 73hp. so i think it will be a good combo. Tom at JBP is doing the work on the pump to get all the dimensions right.

    Where did you get the minicat hull. That is what i originaly wanted to build but ended up with a 1980 Cjet mini boat. Thing looks pretty sweet. Do a search for my user name i have some pics up here and a few on lilwakes build page.

    I know JBP has a mini pump for sale but it is a custom deal and is expensive. keep an eye on ebay. but if you know of one that is for sale then i would say go get it. you could resel the hull or patch the jet hole and put a little out board on it and sell it as a little fishin boat.

    if you have any more questions feel free to ask.. PB is going to have a mini boat navy soon.
    2006 22ft Placecraft 496 Mag

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    i found the mini cat out of seattle washington. about 3 hours from me. picked it up for $300. it's in decent shape too. it was setup for an outboard when i got it, but i want to go inboard for sure. i think i may have actually just found a 6j pump for sale. i have my fingers crossed! i saw the pics of your boat bartel! it looks totally cool! i will post up some pics of mine tomorrow. i was thinking about stuffing a 450R quad motor in mine, but i want to get the pump, and get it mounted, and that whole portion dialed in before i worry about the motor.
    Cougar Cub mini cat 10
    complete overhaul in progress / inboard jet conversion


  6. #5
    Senior Member bartel's Avatar
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    i was planning the same thing. I was going to use a honda 450x motor since it has the electric start. And it has about 60hp if built up a bit. and you could definatly fit that in your confined space. plus running a chain drive you could swap out sprockets to get the correct rpm for your pump.

    i would say as far as your build goes a nice 450 motor with electric start would be a nice way to go. what i was planning was building an aluminim tube box in the back of the boat then weld up tabs to hold the motor above the shaft of the pump. cut a chain to fit and boom you are on the water..

    keep me posted on your build and ya post some pics. I will upload some more of my project tomorrow.
    2006 22ft Placecraft 496 Mag

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    Senior Member $uperJoe's Avatar
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    just a heads up about a chain drive, two small sprockets together will have the chain bend a lot. bending a lot even on a well lubed chain will cause friction, thus heat, thus chain stretch. you would be surprised how fast they will wear out. even with a street bike 525 chain or larger (930 if i remember correctly) its short lived. ive done similar things with bike motors on golf cart setups. i would highly recommend a direct drive shaft if at all possible. its really the only way to go, but again thats just my two cents

  8. #7
    Senior Member Lildave's Avatar
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    Find you a later model totalled quad or bike that has a shaft drive setup. Plenty of them went to that several years ago.

  9. #8
    Senior Member Lildave's Avatar
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    Personally, I'd put an older carburated version of a 13b rotary engine in something like that. They are tiny and will turn some major rpm's!

    Second thought on that quad engine idea. They have gearboxes attached to them. Then you somehow have to rig up a shifter, worry about if you're in the right gear, etc.

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    Senior Member LIL WAKE's Avatar
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    You don't have to go all PIC CRAZY like me, but at least let us see the damn thing!

    1988 Addictor 333 powered by Seadoo 787cc Rotax (110hp)

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    Just a thought, at the power levels you are talking about, a flat belt could be an option. Pretty simple, not lube to deal with. Lot of motorcyles running around with them so must be durable.

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    okay okay!! i'll have pics up of it tonight! i also just located a berkeley 6JC jet drive that should ship out early next week!! i'm super stoked!
    Cougar Cub mini cat 10
    complete overhaul in progress / inboard jet conversion


  13. #12
    Senior Member $uperJoe's Avatar
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    Quote Originally Posted by fastmarlene View Post
    Just a thought, at the power levels you are talking about, a flat belt could be an option. Pretty simple, not lube to deal with. Lot of motorcyles running around with them so must be durable.
    a flat belt or the 2-1 reduction and variable belt drive from an older snowmobile. use the power plant as well. cheap if your from where there is snow, and fairly easy to make scream. with the cvt trans you could probably build a pump that out powers your motor and over compensate with the trans

  14. #13
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    yeah i plan on the pump shaft to sit about one inch above the tunnel floor, and that will put the grate of the injet right about flush with the bottom of the boat. then whatever power plant i end up putting in it the crankshaft will most likely sit about 7" give or take higher. then i plan on using basically a timing belt off an automotive application with essentially cam gears to turn them. i am a machinist by trade, so i have the capability to manufacture something like this to work for me.
    Cougar Cub mini cat 10
    complete overhaul in progress / inboard jet conversion


  15. #14
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    and for the pics!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!


    on the way home with it in the back of the truck.




    had to set her in the water that night!



    stood it up and sprayed it out the next day



    how it looked after cutting










    Cougar Cub mini cat 10
    complete overhaul in progress / inboard jet conversion


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