X2 prop ????

L

lovewinz

Location
67212
I have a 89 X2 with a 750 small pin, Dual Sudco blue 42mm factory pipe (2 screw version) SX chamber, Westcoast water box, ADA head 26cc domes (180psi +/-2), Boysen reeds, MSD Enhancer 4251, Taylor Cable 8mm Spiro-Pro wires, Jet Dynamics intake grate, Jet Dynamics 2" set-back pump kit 650 pump, Mariner reactor swirl prop (pitch unknown), Ocean Pro ocean D nozzle, 7100rpm on flat water and not going anywhere.

I also have another X2 with a 650 pump Solas 13-19 stock nozzle in it. Would I be better off just taking those parts off the second ski and putting them on my 750small pin?
 
john zigler

john zigler

Vendor Account
Location
wisconsin
Sounds like you are over powering your current impeller. The Mariner impellers are old, and would be for a 650.

13/19 Solas will be a little better, but I bet you will over power that as well.

We like the Hooker 10/16 in a 750 X2;

watcon.com

Iimpeller Hooker Kawasaki 650 140mm 10-16

Impro's Hooker Impeller, Kawasaki 650 140mm Jet pump, 650sx, X2, TS, Jet Mate, etc. 10-16 pitch. Large 75mm hub, cut back 7mm, polished stainless steel radial blade design make these one of the best performing impellers on the market. Designed for MAXIMUM bottom end, and "hook up". Please email...
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kevbo

kevbo

Location
dfw
A low port 750 can pull a higher pitched impeller. The higher port cylinders may really struggle to get on the pipe with the same prop. You often have to see how quickly it responds and then do some pump load tuning to make it right. In your case it’s turning up enough rpm but not biting any water. Look for a sharp protrusion in the inlet and/or a massive air leak. A badly damaged impeller will do the same.
 
L

lovewinz

Location
67212
I sent my pump, prop and reduction nozzle off to Impros. Glen is going to get me hooked up. No more Mariner and I can get leave the XXX2 alone.
 
L

lovewinz

Location
67212
I got everything back and lost about 500 RPM only running about 6500-6600. Coming out of the hole is better but only getting about 43MPH on flat water. I think my pump is loading up with water. It was recommended that I cut my intake grate down some.
 
kevbo

kevbo

Location
dfw
Adjusting the pump load to the engine takes some practice but is critical for good performance. It’s also very easy to melt a piston if rpm is too low.
 
WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
lovewinz said:
Well it is a 10/16 it was just re-pitched to a 11/17. So what is the difference? Glen said that Mariner was a straight 16.
Click to expand...
Whats the difference between 4:11 rear end gears and 2:55 rear end gears the difference is that with 4:11 gears anything including a four cylinder will pull full RPM at that gear ratio, with 2:55 gears a four cylinder would be lucky to pull off much less reach full RPMs , so you have two choices, less degrees on the impeller or more engine in front of the impeller to pull it , in your case you have already shown that your engine won't pull that high a degree of impeller pitch
 
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kevbo

kevbo

Location
dfw
lovewinz said:
Well it is a 10/16 it was just re-pitched to a 11/17. So what is the difference? Glen said that Mariner was a straight 16.
Click to expand...
Thats a lot of load and it can really wreck performance. I have been working on a high port 750 with a Superjet B pipe. It needs to be reliable for the kids so it got a stock head. This combination required a much flatter impeller than I ever imagined. Nearly 1" between blades!
 
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WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
It means that the prop is a progressive pitch, the starting pitch or front edge of the impeller is 10 degrees and it gets progressively bigger to the max of 16 degrees at the rear.

it's gives you great takeoff with the lower pitch at the front and good top end with the higher pitch at the rear .
 
kevbo

kevbo

Location
dfw
lovewinz said:
Here is the last dumb question for the day. What does the 10/16 mean?
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Originally blades were pitched in a straight line from the leading edge back. In the early 90s they figured out making the leading edge flatter made them run smoother and prime better at low speeds. The actual numbers assigned to an impeller are meaningless as a load indicator unless you already know a lot about the particular brand and type. Most of the load is at the rear inch of the blades. Thats why raising or lowering them there makes so much difference.
 
WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
kevbo said:
Originally blades were pitched in a straight line from the leading edge back. In the early 90s they figured out making the leading edge flatter made them run smoother and prime better at low speeds. The actual numbers assigned to an impeller are meaningless as a load indicator unless you already know a lot about the particular brand and type. Most of the load is at the rear inch of the blades. Thats why raising or lowering them there makes so much difference.
Click to expand...
yes if you know what you are doing you can bend the back blades to reduce the pitch but all three blades have to be the same and the measurements have to be exact, not something I can suggest the average Joe needs to be messing with.
 
beerdart

beerdart

4-Tec Jetmate
Location
CT
Blade root angle plays a big part in how much you can tweek the impeller. General rule 1mm on the trailing = 100 RPM depending on HP. Some other tricks are adding a "Kick" to the blade.
 
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