Mini Jet Build

[Weasel]

Well the original jet ski intake is not up to the task. I figured it would be a weak link but thought I would give it a try before just ripping it out.




Still have not decided whether to go with a cast intake with nice heavy duty grate or fabricate one here. Looks like it can be done several ways. I played around a little yesterday on solidworks with the Sheetmetal tool (which I rarely use) and I looks like it should be doable.

Hit a few things pretty hard, made a big groove in the rear inlet lip. Broke some of the inlet bars loose. Don't think it all happened at the same time but got sorta rough with it.

The ship runs clean on about 2 inches of water at about 30+ MPH but somewhere at around 2 to 1.5 inches water it stops real quick. Beached it several times while ripping along. You defiantly want to be sorta braced up.

 

[Weasel]

Toying with the idea of fabricating the intake myself. The hardest part looks to be making a heavy duty stomp grate.
In the end I may still just order a cast setup with grate complete from a vendor.

 

[Weasel]

It looks like the intake repair will constitute quite a bit of renovation so will probably turn into a complete overhaul of the ship. Considering UHMW sheeting on the bottom like some of the mini jets run up north. Question is, will UHMW sheet help any with sliding on sand? Any experience?

 

[Liveto99]

I love the Bi plane.
I dated a chick that said she was Bi, I thought that is was going to be awesome! But turned out she was Bi polar.

 

[Weasel]

Well, the intake is removed. Gutting the hull to bare metal and stripping the entire interior out. New cast intake is on the way with heavy duty stomp grate.

 

[buckbuck]

I am late to your party @Weasel but I am hooked now.

 

[Weasel]

Playing some with interior layout. Not much room in the little thing. Rear seats will end up pretty narrow but my girls are little. They should be able to ride quite a few years. If I were building from scratch would consider making a contoured bench for the front but in this case probably move ahead with the current seats.

 

[Weasel]

Looks like, just put it in and go.....

 

[Weasel]

Any of you jet boaters here happen to have access to the technical spline information on a Yamaha wave venture 1100 impeller shaft? Caliper measurements show 0.700" or 17.78mm major diameter with 16 spline teeth. I have been digging for a while and so-far have not been able to find a spline standard to match the shaft.

When installing the new pump inlet the plan is to move the engine back requiring a shorter impeller shaft. I have a machinist that has the capabilities of cutting the shaft and re splining the end but would need to locate the geometric data for him.

 

[Weasel]

Progress has been slow. Work getting in the way....

Ordered some aluminum sheets for fabricating engine cover. Also just received some MLV for noise control. Need to settle on a material for a decoupling layer between the MLV and cover.

 

[Weasel]

Intake finally tacked in place squared up with the transom. will have to cut out the center of the transom and replace some of it since the new intake outlet is higher than the previous one.

 

[Recoveringfiberglassaddic]

Dont know how I missed this thread. Fun looking boat. Good call on the stomp grate. I cant speak to the UHMW sliding on sand, but have seen where the bolt holes start to stretch the aluminum from lots of rock bar sliding. May be worth running your stringer up into the nose a bit if you are going to be running over logs(which from your pics looks about every waterway you are on lol).

 

[Weeb]

Your definitely very talented todo all that work.

 

[Weasel]

Dont know how I missed this thread. Fun looking boat. Good call on the stomp grate. I cant speak to the UHMW sliding on sand, but have seen where the bolt holes start to stretch the aluminum from lots of rock bar sliding. May be worth running your stringer up into the nose a bit if you are going to be running over logs(which from your pics looks about every waterway you are on lol).

Good idea on the stringers. Thinking about doing a complete new boat in the future and may include that. Yes, logs everywhere ?

 

[Weasel]

Your definitely very talented todo all that work.

Honestly not a great deal of talent. Just persistent ?. U aughta see all the stuff I have trashed over the years just to make something over again. If ya don't like it, just tear it out and re do. Sometimes several times.

 

[Recoveringfiberglassaddic]

Good idea on the stringers. Thinking about doing a complete new boat in the future and may include that. Yes, logs everywhere ?

That boat I attached a pic of was a JetStream kit that I helped my buddy with last winter. Was a ton of fun, and a lot of problem solving. Fun part about doing it yourself is you can make it easy(er) to service down the road.

 

[Weasel]

you can make it easy(er) to service down the road.

Trying to keep that in mind as the rear seat and interior are designed.

 

[Weeb]

Honestly not a great deal of talent. Just persistent ?. U aughta see all the stuff I have trashed over the years just to make something over again. If ya don't like it, just tear it out and re do. Sometimes several times.

Well your persistence pays off lol.

 

[Weasel]

Running shallow in these rivers even with care fills the engine cooling water sand filter pretty often if ya hit a bar few times. I find myself cleaning it several times each outing. When the engine cover is built, I will not have the ability to casually look around and visually see the sand level. Will probably need to rig up some type of alarm so that when the water pressure drops to a certain pressure I am alerted and can clean the filter before waiting on the engine to overheat.

Any ideas? In a perfect world I would have some sort of sensor in the sand trap that would directly measure the level of solids in the bowl but all I have found so far seems to be fairly expensive ultra sonic sensors.

Anyone have the specs handy for min. water pressure at idle and WOT?

 

[swatski]

Running shallow in these rivers even with care fills the engine cooling water sand filter pretty often if ya hit a bar few times. I find myself cleaning it several times each outing. When the engine cover is built, I will not have the ability to casually look around and visually see the sand level. Will probably need to rig up some type of alarm so that when the water pressure drops to a certain pressure I am alerted and can clean the filter before waiting on the engine to overheat.

Any ideas? In a perfect world I would have some sort of sensor in the sand trap that would directly measure the level of solids in the bowl but all I have found so far seems to be fairly expensive ultra sonic sensors.

Anyone have the specs handy for min. water pressure at idle and WOT?

Not exactly the info what you are looking for but may be useful:

https://jetboaters.net/threads/how-to-install-temperature-gauges-and-senders-for-engine-temps.23774/

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