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Thread: extreme shallow reverse problems, rocks!!!!!!!!!

  1. #1
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    Default extreme shallow reverse problems, rocks!!!!!!!!!

    I have a jetcraft extreme shallow. When I use the reverese in shallow water it blows rocks from the bottom of the river up onto the reverse/jet bucket. Then I cannot put it in forward cause rocks are stuck in there. I know they come up with some little plastic piece that is suspose to prevent this but it doesnt work. Has anyone come up with a solution. I am thinking about getting and old inner tube off of a car tire and some how making a cover over the top of it. My thinking is that when the rocks blow off of the bottom of the river they are shooting up and landing on top of the bucket and wedging in. With a piece if inner tube some how wrapped over the top it might prevent this from happening. This is a real problem when you are about to float into a gravel bar.

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    Member skybust's Avatar
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    WOW that is a problem I have a SJX are you running mecury 200 sportjet, the only reason why I ask is that is what I have and have never had that problem? wish I had an answer for you.

  3. #3
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    Mine has the jmax yamaha engine, I think it has a different jet system from the sportjet.

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    Member tjm's Avatar
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    How shallow is the water when that happens? Sounds like it must be pretty shallow. Are you throttling hard to do it or does it happen while being gentle with the gas?
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    Its in about 6 inches of water, and you dont have to hit the throttle very hard.

  6. #6

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    are you pumping small rocks through and out the nozzle? I've jammed my steering before bumping the bottom and pumping what seemed to me like sand. Small enough rocks could do that too I guess. They would try to exit the nozzle and hit the bucket possibly wedging in in the smaller clearance areas. I would say that if your bouncing along the bottom to just be careful with the throttle if possible.

  7. #7
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    No, the rocks arent coming through the pump. If you were to look at the set up on a 1875 extreme shallow with the jmax engine you will see where the water goes when you put it in reverse. It doesnt go around like on a sportjet, the flow goes almost straight down. Causing the blast of water to shoot the rocks up and landing on the top of the bucket.

  8. #8
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    I don't have an SJX but I do have a thought , is the reverse bucket properly adjusted If the jet stream is being directed straight down it won't make a reverse push, it should be directed forward and under the boat as much as possible.

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    Yes its adjusted properly, my dealer has the same boat and his does it also. In fact everyone that I have talked to that has the extreme shallow or the white water jetcraft boat with the jmax has the same problem. Jetcraft came out with a little plastic piece that the dealers were suspose to add to the jet to prevent this but it doesnt work like they thought it would. Jetcraft knows about this problem but that havent come up with a fix for it.
    If you get a rock stuck back there you have to get a screw driver or something and reach down there and pry out the rock or rocks. Once the rock jams in there the throttle lever wont move at all, I have tried. As far as Im concerened its a major safety hazard. When this happens you are stuck in reverse and you cannot move the throttle so you have to shut the engine off to keep from moveing in reverse under power.

  10. #10
    Member Jimw's Avatar
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    WOW I know we a talking apples and oranges on the set ups we have. If i shut my motor off and it isnt at idle it will diesel, suck water into the heads and compression lock. Dont ask me how i know this..... A 350 can shoot water a long ways out of a spark pug hole. My set up will do the same thing with small rocks pining the reverse bucket down so it get stuck in reverse. Mostly when pulling the boat off the bank with the throttle. Now i have someone give it a a good push and 99.9% of the time I'm good. $0.02
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  11. #11
    Member OzAK's Avatar
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    Geez and I thought any issues I had with my beast were a pain. Glad the Sportjet reverse works as well as it does, in fact, its incredible. I havn't looked at a J-max from the business end underneath. Any chance of a modification to the reverse nozzle(s) by welding add-ons to redirect the flow in a more appropriate direction? Stock Sportjet reverse bucket was crap for any decent reverse before adding extensions to redirect flow. All I've got without a visual. Oz

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