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4/29/2023

How to Build a Jet Ski Impeller

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​How to Build a Jet Ski Impeller
​

If you're a fan of personal watercraft and want to improve their performance, building your own jet ski impeller could be a great option. Impellers are a key component in the propulsion system of jet skis and are responsible for generating thrust by drawing water into the craft's impeller housing and then expelling it through a nozzle at high speeds.

Here's a step-by-step guide on how to build a jet ski impeller:

Step 1: Design the Impeller

The first step in building a jet ski impeller is to design it. You can use 3D modeling software to create a detailed design, or you can draw the impeller by hand on paper. The design should include the shape and size of the blades, the diameter of the impeller, and the pitch angle of the blades.

Step 2: Build the Casting Jig

Once you have the design, the next step is to build a casting jig. The casting jig is used to make the mold for the impeller. You can build a casting jig out of wood or metal, depending on your preference. The jig should be the exact shape of the impeller and should have a hollow core to allow the molten metal to fill the mold.

Step 3: Cast the Impeller

After the casting jig is completed, you can cast the impeller. You'll need to melt the metal, typically aluminum, in a furnace until it becomes liquid. Then, pour the molten metal into the casting jig and allow it to cool and harden. Once the metal has hardened, you can remove the impeller from the jig.

Step 4: Clean and Finish the Impeller

After the impeller has been removed from the casting jig, it will have rough edges and may require additional finishing. You can use a grinding wheel or sandpaper to smooth out the edges and give the impeller the desired finish.

Or

MACHINE Impeller

Machining an impeller out of aluminum or steel is another option for building a custom impeller. Machining an impeller can offer more precise control over the design and manufacturing process, allowing for greater customization and tighter tolerances. However, machining an impeller requires specialized equipment and expertise, and may be more expensive than casting an impeller.

One advantage of machining an impeller is that it allows for the use of stronger materials than those typically used in cast aluminum impellers, such as stainless steel or titanium. These materials can offer improved durability and resistance to wear, making them ideal for high-performance jet ski applications.

However, machining an impeller requires a solid block of material, which can be expensive and wasteful compared to the casting process. Machining also requires specialized equipment, such as a CNC machine or lathe, and may require more time and expertise to produce a finished product.


Step 5: Install the Impeller

Once the impeller has been cleaned and finished, it's ready to be installed in the jet ski. The impeller should be placed in the impeller housing and secured in place with bolts or screws.

In conclusion, building your own jet ski impeller can be a rewarding and cost-effective way to improve your craft's performance. By following these steps, you can create an impeller that's customized to your needs and preferences. Remember, it's important to take your time with each step to ensure the impeller is built correctly and works safely.

A custom impeller typically starts at $10k to build from scratch depending on size. 

Impellers.com

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4/24/2023

Sell Your Used or Damaged Sea Doo 4 Stroke Impellers to Experts at Impellers.com

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​Are you the proud owner of a Sea Doo model watercraft or boat with a damaged impeller? Or perhaps you have upgraded your watercraft and now have a used impeller lying around? Look no further! At Impellers.com, we are interested in buying your used or damaged impellers for Sea Doo 4 stroke models.

Why sell your impeller to us? First and foremost, we are experts in impeller repair and replacement. We have years of experience in the industry and can recognize the value of a used or damaged impeller. By selling your impeller to us, you can be sure that you are getting a fair price for your item.

Additionally, selling your impeller to us is an eco-friendly option. Rather than throwing away your damaged or unused impeller, you can help reduce waste by selling it to us. We will either repair the impeller or use its parts to repair other impellers, ensuring that it doesn't end up in a landfill.

At Impellers.com, we are interested in buying impellers for Sea Doo 4 stroke models. Whether your impeller is damaged or used, we want to hear from you. Selling your impeller to us is a hassle-free process. Simply contact us and provide us with some basic information about your impeller, including its condition, model, and any other relevant details. We will get back to you with a quote and arrange for payment and pick-up of your impeller.

Don't let your used or damaged impeller go to waste. Sell it to Impellers.com today and help keep our waterways clean and healthy while earning some extra cash.
​
Impellers.com

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4/15/2023

Stand Up VS Sit Down Watercraft

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The personal watercraft (PWC) industry has been dominated by two primary groups for quite some time: stand-up and sit-down riders. While there is no clear winner between the two, each side has its own reasons for why they prefer their particular style. To fully understand the issue, we need to look back at the history of the PWC.

Initially, personal watercraft meant stand-up Jet Skis, which were produced by Kawasaki. However, the industry changed when Yamaha introduced the Wave Jammer and Wave Runner, which started the sit-down revolution. While Yamaha also produced a stand-up model, other companies entering the market ignored the ski segment and concentrated solely on runabouts.

The stand-up enthusiasts believe that skis are the only true form of the sport and that runabouts are a passing fad. They see Yamaha stand-ups as unproven newcomers and insist on the tried-and-true Kawasakis. Stand-up riders often look down on runabout riders, citing the increased difficulty of ski riding as a "rite of passage" into the inner world of personal watercraft.

On the other hand, runabout riders' feelings are not as strong. They are often new to the sport of PWC and so enamored with it that they don't pay much attention to the shrinking ski segment. Runabout riders can legally and comfortably take a friend or two on their craft, pull a waterskier if the mood strikes, and ride for longer periods of time without refueling or stopping to rest tired legs.
​
While there is no easy answer as to which form of personal watercraft is better, personal opinion reigns supreme. Regardless of which side you are on, it's important to remember that both forms of personal watercraft are a legitimate form of recreation. Ultimately, it's up to the individual rider to decide which form they prefer.

Bobby Boop
Impellers.com

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4/13/2023

Superjet Hardware Bolt Size

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​Application #Used Grade Head Thread Size Pitch Thread Length mm Shaft Length mm Socket Size Torque Specs McMastercarr#

Parts for Yamaha 62t and 61x Motors


18-8

Motor Mounts to Hull 8 18-8 Hex M8 1.25 25 30 91287A154

Motor Mounts with Kenny Keepers to Hull 4 18-8 Hex M8 1.25 30 40 91287A305

Bed Plates to Motor Mounts 4 18-8 Hex

Bed Plates Port - - - - - - - - - -

Rear 1 18-8 Hex M10 1.25 30 70 11,18 91287A181

Middle 1 18-8 Hex M10 1.25 30 70 11,18 91287A181

Front 1 18-8 Hex M10 1.25 30 80 11,18 91287A379

Bed Plates Starboard - - - - - - - - - -

Rear 1 18-8 Hex M10 1.25 30 70 11,18 91287A378

Rear/Middle 1 18-8 Hex M10 1.25 35 35 11,18 91287A173

Front/Middle 1 18-8 Hex M10 1.25 30 70 11,18 91287A181

Front 1 18-8 Hex M10 1.25 30 70 11,18 91287A181

Case bolts (bottom) 8 18-8 Hex M8 1.25 25 85 12mm 11.18

Cylinder to Cases 2 18-8 Hex M10 1.25 30 55 14mm 16-29 91287A373

ADA Head Gridle Nuts 6 1.25 15-18-23

Cylinder to Cases 4 18-8 Hex M10 1.25 30 40 14mm 16-29 91287A374

Head to Cylinder 10 18-8 Hex M8 1.25 25 50 12mm 15-18 91287A309

Head to Cylinder 10 18-8 Allen Socket M8 1.25 28-34 50 6mm 15-18 91292A154

Exhaust Manifold 8 18-8 Hex M8 1.25 30 30 10mm 11-22 (Factory13) 91287A154

Exhaust Manifold 8 18-8 Allen Socket M8 1.25 30 30 6mm 11-22 (Factory13) 91292A149

Intake Manifold to Cases 8 18-8 Hex M6 1 25 25 10mm Tight 91287A138

Intake Manifold to Cases 3 18-8 Hex M6 1 20 35 10mm Tight 91287A141

R&D Dominator Intake Manifold to Carb STUD 4

R&D Dominator Intake Manifold to Carb NUT 4

Reed Cages to Manifold 4 18-8 Hex M5 0.8 15 15 8mm 91287A124

Reeds to Reed Cages 16

Stator to Cases 2

Flywheel key 1 none

Flywheel to Crank Bolt 1 70

Flywheel Cover to Cases 7 18-8 Hex M6 1 25 25 10mm Tight 91287A138

Flywheel Cover to Cases 7 18-8 Allen Socket M6 1 25 25 10mm Tight 91292A138

Flywheel Cover to Cases 7 18-8 Button Allen Socket M6 1 25 25 10mm Tight 92095A242

Starter to Cases 2 18-8 Hex M8 1.25 25 40 13mm Tight 91287A305

Coupler Cover to Cases 2 18-8 Hex M6 1 25 25 10mm Tight 91287A138



316

Motor Mounts to Hull 8 316 Hex M8 1.25 20 30 93635A326

Motor Mounts with Kenny Keepers to Hull 8 316 Hex M8 1.25 30 40 93635A336

Bed Plates to Motor Mounts 4 316 Hex

Bed Plates Port

Rear 1 316 Hex M10 1.25 30 70 93635A457

Middle 1 316 Hex M10 1.25 30 70 93635A457

Front 1 316 Hex M10 1.25 30 80 93635A462

Bed Plates Starboard

Rear 1 316 Hex M10 1.25 30 70 93635A457

Rear/Middle 1 316 Hex M10 1.25 35 35 93635A428

Front/Middle 1 316 Hex M10 1.25 30 70 93635A457

Front 1 316 Hex M10 1.25 30 70 93635A457

Case bolts (bottom) 8 316 Hex M8 1.25 25 85 12mm

Cylinder to Cases 2 316 Hex M10 1.25 30 55 14mm 93635A449

Cylinder to Cases 4 316 Hex M10 1.25 30 40 14mm 93635A438

Head to Cylinder 10 316 Hex M8 1.25 25 50 12mm 93635A340

Head to Cylinder 10 316 Allen Socket M8 1.25 28-34 50 6mm 92290A449

Exhaust Manifold 8 316 Hex M8 1.25 30 30 10mm 93635A326

Exhaust Manifold 8 316 Allen Socket M8 1.25 30 30 6mm 92290A434

Intake Manifold to Cases 8 316 Hex M6 1 25 25 10mm 93635A214

Intake Manifold to Cases 3 316 Hex M6 1 20 35 10mm 93635A222

R&D Dominator Intake Manifold to Carb STUD 4

R&D Dominator Intake Manifold to Carb NUT 4

Reed Cages to Manifold 4 316 Hex M5 0.8 15 15 8mm 93635A164

Reeds to Reed Cages 16

Stator to Cases 2

Flywheel key 1

Flywheel to Crank Bolt 1 51 stock more on TL

Flywheel Cover to Cases 7 316 Hex M6 1 25 25 10mm 93635A214

Flywheel Cover to Cases 7 316 Allen Socket M6 1 25 25 10mm 92290A330

Starter to Cases 2 316 Hex M8 1.25 25 40 13mm 93635A336

Coupler Cover to Cases 2 316 Hex M6 1 25 25 10mm 93635A214

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11/5/2022

Should I buy a new impeller?

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Pump ​impeller fail can happen in a couple of ways. 1st would be from wear & tear. The 2nd is from damage to the impeller & wear ring  from objects and debris being sucked up into the jet pump system. 3rd reason to switch out your stock impeller is for better performance out of your PWC or boat. Replacing stock impellers to get the maximum power from your jet ski or boat especially for watercraft racers is a plus.

​Do you have power loss/ performance loss? Are you having cavitation issue?
Look from the back of your ski or boat forward through exit nozzle and if you see dings are on your impeller? If So, Then that blade could be knocked out of degree and it is probably best you switch it out. 

The Impeller PROS
Impellers.com

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12/27/2019

Winterize my jet ski for the cold

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I'm a little confused about whats right. This fall when weather started to get cold here I decided ( as I have done with my previous boats) to winterize my kawasaki jet ski. While I was searching for the best price around town I was surprised to learn that unlike boats different dealers have completely different ways of dealing with the cold. One dealer that all they've been doing throughout the years is running the motors dry until all the water is expelled. The next dealer said that I should take some part of the plumbing off and blow pressurized water through what I presume are the lines. And the last dealer said that I should run antifreeze through seawater lines to get the water out. Of course all of them Fogged the engines. What do you think is right? are all the methods okay?
Thanks Bobby

Dear Bobby,
In the cold you want to get out all the water as it can freeze and expand and possibly crack your cylinders and exhaust manifold. You want to run Jet Ski engine as it will get water out of exhaust system. You can blow compressed air through the water line that goes to the jet pump (blow air both ways). Or you can add antifreeze to the cooling lines filling up the waterjackets. Also add some fuel stabilizer to the fuel or plan on draining the gas before you go riding again and add fresh gas (You can take the old fuel and put it your car). You should add an ounce of oil in each cylinder, Charge the battery from time to time during winter.
Jetski Guru

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12/27/2019

Frozen Yamaha Jet pump housing

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I have a Yamaha GP 1200 and A Yamaha Waveriader 700. Both of these Jetskis had their Yamaha impellers freeze up in the Yamaha jet pump housing. My mechanic said this was the result of salt ( I run these PWC's in salt water) getting behind the impeller housing and causing expansion of housings into impellers. The JetSki mechanic suggested that I hose off the impeller and housing after each use. The Yamaha GP1200 has a Solaris SS impeller while the 700 is stock. Thanks for your assistance.
Buck

Hi Buck, Your mechanic is right and you should wash off salt every time you ride Jetski watercraft in ocean. It will help preserve your jet ski and its jet ski parts. The Yamaha Jet pump housing has this issue of becoming out of round due to a chemical reaction behind the Yamaha wear ring. We offer a solid steel Yamaha pump housing that will solve this problem.
​Watercraft Mechanic PRO

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12/27/2019

TWO Hard Starting Kawasaki ZXI 1100's

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I have 2 1998 Kawasaki ZXI 1100's machines and they are both hard starting unless i pull the spark plugs and put a little gas into cylinder. If I do this they start right up. Can I put an inline gas bulb into the gas line and force gasoline into the cylinders before I try and start them?
Thanks, Mitch

Hi Mitch,
Yes, but we call it a primer kit. These primer kit will allow you to squirt gas into carbs with a push pull plunger that hooks up to the fuel line. Not only does the jet ski primer kit help with starting it also adds life to your Jet Ski starter.
Watercraft Maintenance Man

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11/23/2019

ZXI Removed Oil Injection

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I have a 1995 Kawasaki JS750 ZXI Jet Ski. The previous owner removed the oil injection system with Oil Pump Block Off Plate and mixed it the gas 40:1. I was wondering if it is worth it to put the oil pump back on? Or if it would be better for the machine. If not what is the best fuel ratio to run, and is there anything I should check to make sure the owner did everything right when he took off the oil system?Also, my machine doesn't seemed like it is as quick or fast as it should be. Is there anything else I should check, Like impeller or reeds.
Russ

Russ, Reasons for removing oil pump is that Oil pumps can fail and You are able to pre-mix to a precise measurement as different oils offer different mixtures. I usually go 40:1 with standard oil and 50:1 with Synthetic oils.
  I would definitely check the Kawasaki impeller for nicks in the blades and the gap between the Jet Ski impeller and pump housing. If they have any issues that could defiantly cause a speed issue. Your ski is pretty old and I would recommend putting in some new reeds. I would do a head compression check and make sure all three cylinders are within 5lbs of each other. If they are more then 10psi between them you will need to do a rebuild top end piston kit.
​Ski Mechanic Tech Talk

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11/23/2019

Ski Sits for 20 minutes then hard to start

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I have a 2001 Yamaha XL800, It runs great with one exception. after riding approximately 20-30 minutes or longer, If I stop 20-30 minutes or longer, it will not just crank up and go. If Im lucky , I can feather the throttle and it will clear up and go. One dealer says its a vapor lock caused by heat escaping via the carburetor. Another dealer says its because the engine cools off so fast that I need to choke it when restarting it. Chocking doesn't solve the problem. Once it gets going again, it runs fine. What do you think.
Steven

Steven, It sounds like you have a bad needle and seat in the carburetor. When you sit for 30 minutes the seat leaks and can flood your engine and makes it hard to start.  Get a carburetor rebuild kit.

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