300/440/550 x2 problem
- Thread starter shawn_NJ
- Start date
If Impros had it, why wouldn't they have cut it back for you, they knew it went in that pump, no?:banghead:
shawn_NJ
Chasing waves.
- Location
- Daytona Beach
They installed it in the pump and even realigned the pump spindle. I am at a loss here. It was sold to me as a 650 prop from someone on PWC. I read elsewhere that the oring inside is a dead giveaway that its a 750 as well as 650's never had Orings on the bottom of the threads.... I lost a whole day and the cost of 2 way shipping on this to impros.....
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D Slicker
Durham, dont forget it
- Location
- Pottstown, PA
Shawn, I am running an SX-R impleller in my pump and had the same problem at first. I had sent my impeller to impros and they forgot to mill 6mm off of the back., I sent it back and they milled it now it fits perfect.
shawn_NJ
Chasing waves.
- Location
- Daytona Beach
How much do they charge to mill it?
shawn_NJ
Chasing waves.
- Location
- Daytona Beach
Thats not bad, I just want it back by next weekend. Is there any disadvantage running a 750 or is it the same after milling it back?
With a stock 650 motor it may be a little sluggish off the bottom, with the motor you are putting together, I suspect it might be too low. I can tell you that my 12/17 swirl moves a lot more water compared to the standard type. Pete was running a 14/19 swirl with his 820 and probably needed more. I'm planning on trying the 13/18 SXR big hub stocker to see where I'm at when I get the 750 going. And then there is the nozzle, cone, and pump insert.....good grief.
shawn_NJ
Chasing waves.
- Location
- Daytona Beach
The ski HAD a 14/19 speed prop with the 650 and it was slow to go but not aweful, and F'ing ripped up top! But that was for the semi stock class that never happened. I think the 650 will do OKish with a 9/17 (its got a FP and 42mm). I am not too worried about it since I am only going to a flatwater event from now till the third week of may when the 750 goes in. I was really curious to see how the 750 would be with a 9/17, I figured it would be too low, but how low was what I wanted to see. Do you like your 12/17 swirl? Is it a cutback or a 650 prop? I have a 12/14 750 prop that I was keeping to get repitched if the 9/17 sucked too bad. I dont think I am going to have the 9/17 machined, I'll just sell both 750 props. Take the cash and order a 12/17 swirl as that what I ultimatly want to have in there.
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fittyx2
I'm bringing X'y back
- Location
- Hamilton Ontario, Canada
I'm running a Skat 9-17 in my 650x2 with no problems... lots of pooer down low.
Shaun, what are you doing with that stock 95 impeller??? Wanna sell her???
-Scotty
Shaun, what are you doing with that stock 95 impeller??? Wanna sell her???
-Scotty
It might work with a 78-80mm nozzle, keep in mind the 750 makes way more torque. Dan Hansen and I had a long talk about this last year at Scooteny, and I doubted him a little then. Now I'm convinced, if you go too low you don't get to see the real benefit of the additional torque. Snackem knows my setup, stock 650, bpipe, 12/17 650swirl, 85mm nozzle, short pump cone. Oh, and it rocks.:biggthumpup:
So you think that a 12/17 or 12/19 would be better then? What about with a different nozzel? I'm not going to change my nozzle out until I get a new prop but if you did both at the same time wouldn't the 9/17 be a good choice?
that does hit quite nicely. . .:biggthumpup: :biggthumpup: :biggthumpup:
Think about this, you rode my ski and it was tuned about as good as it gets with a 650. If I add more HP and torque, is it going to rev faster? Its already almost instantanious now, the only way to take advantage of the extra power is to increase pitch, or reduce nozzle diameter(or both), or the pump insert in conjuction with the other 2. I know for a fact, a standard 9/17 my neighbor put in his bone stock 750sx made a huge difference for him over stock, and it should have the 80mm nozzle. (I can check) SXR uses the 13/18 big hub swirl stock, with a 78mm nozzle I believe. It all about finding the right combination of pump pressure for your setup and engine mods. I just happen to be lucky enough to hit a combination that really works well with my current setup, thus my reluctance to fix something that is already good. Now if I could only get the carb working perfectly as well.