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Discussion Starter #1
Well guys I'm new to the jet boating world. I just bought an 86 21ft Kachina with a 460 and a believe it has a Berkeley pump with a jetvator. My question is that my boats rooster tail is about 6 feet tall and was wondering how I can get a bigger rooster tail. I've heard that putting a wedge in will do this for me but can somebody give me some advise on that. How big should I go and what would I need to buy....thanks in advance for the help.
 

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ROOSTERl

IF its a hydraulic diverter you bring it full up see where it stops. whats stopping it from moving further up? you can grind where the stop is to get a couple more degrees. Warning the further up the diverter goes the harder the steering becomes. (geometrey of the system) If you have a manual control diverter same princaple grind a little where bucket stops. maybe cable adjustment also. hope it helps your spray! I grinded mine to get 4 more degrees up and got 400 feet long 100 feet high at lake mead about 75-80 mph! Im sure speed and weight of boat has alot to do with distance and heigth also!
 

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grind

Thanks for the quick reply........so I will have to grind on the top stop only and how much do u think is safe....like half inch or less. How would I adjust my cable or how will I know if it needs adjustment....I'm very new to all this and will appreciate all the help. I would be at Lake Mead in a couple of weeks and would love to have a huge rooster tail....once again thanks a million for the advise:)devil
 

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Speed is a function of $$
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Unless your using this boat for something other than cruising on the lake I doubt your worried about degrees and pump angle. I'd stay away from grinding just my .02. Much easier to buy a wedge around 50 bucks . A one armed monkey could install in less time and no touch up painting involved :D
 

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Discussion Starter #5
wedge???

Can u tell me if there is a difference in the nylon and aluminum wedges? Will I have to also buy new longer bolts and gaskets? Will I have to use silicone when istalling the gaskets? What degree do u recommend I use...a 2 or 4 degree? One more question....when I go online to look at the wedges, they all seem to have 16 holes and my berkeley pump only has 8 holes where the nozzle connectd to the bowl...will they work for my pump? Thanks for ALL the help guys...it's very appreciated
 

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Discussion Starter #6
jetavator cable adjustment

Can somebody tell how I would adjust my jetavator cable to get a liitle more up angle on my nozzle...thanks
 

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Discussion Starter #10
wedge size???

What size wedge should I go with on my boat if I just want to cruise and spray a tall rooster tail?? I have an 21 ft Kachina with a stock 460 in it plus I would still like a smooth ride
 

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whats a goodtime cost?
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What size wedge should I go with on my boat if I just want to cruise and spray a tall rooster tail?? I have an 21 ft Kachina with a stock 460 in it plus I would still like a smooth ride
the bigger the wedge the bigger your roost will be.
 

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Discussion Starter #13
wedge??

So are the nylon wedges concidered to be the plasitic ones? I heard that plastic wedges dont require a gasket....is this true and if so, would I need to use any kind of sealant and larger bolts???
 

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The more the wedge, the more the rooster tail.

At some point and time, you will get it high enough that the boat will no longer perform well. But that's probably in the 8 to 10 degree up area on that particular boat.

The plastic/Nylon wedges are a lot cheaper and require no gasket or sealer of any kind. They work best when they are put on dry. BUT; they do have a tendency to break and blow out from time to time. The metal wedges are much more sturdy and will not blow out. They do, however, require that you use gaskets between them. They also work best when installed dry without any kind of sealer.

I highly recommend using a Stud Kit instead of bolts, if you are going to play with wedges, (especially if you are going with any more than 4 degrees of wedge). The wedges cause the bolts to bend when they are tightened down firmly enough to keep the unit sealed. In time, you will break the bolts or worse yet wear out the threads in the back of the bowl. The studs will bend to the right angle the first time you tighten them down and will stay that way and make the addition or subtraction of more wedges a lot easier and the studs also hold things in place better than bolts and they have more clamping power than bolts.

Duane HTP
 

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Discussion Starter #15
Duane

Thank you very much Duane.....very helpful info. SO where could I find these stud kits you're talking about and what are their exact name.....THANKS
 

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Discussion Starter #17
blow out wedge

I am runnig a stock Ford 460 with a Holley 4 barrel.........and I won't be racing, just cruising..........Do u think I'll have a problem with blowing out the wedge?
 

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i have a video on you tube showing the different types of wedges i used and each time i used them. with a droop, wedges and diverter, i was good for 24 degress of super soaking fun. i did strip a bolt and steering wasnt the best though. look up "yumajet454" on youtube.

i never broke a wedge, but theres a video around showing a wedge breaking while the diverter is up.
 

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Discussion Starter #19
Yuma

Right on...I'll have to check out ur video and I'm from Yuma too......see if we run into eachother out on the lake or river sometime...show me the ropes to the jet boating world....
 
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