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2001 sportster 5900rpm max

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Im in sister lakes michigan every weekend so I probably pass near you . If you are up for it that would be great
 
Your 30 minutes from me and it's a nice drive South through the orchards to come for a visit, small world sometimes. Sent you contact information as my PM box just overflows here anymore feel free to use it.

The only other thing I might recommend is adding one of these to the boat, it's a single wire attachment that installs by winding the sensor wire around the exterior of the plug wire a couple of times and securing it with electrical tape. I'm not convinced making 42mph over water you're actually losing 1000 rpm's at wot.

You can attach it right at one of the plug wires where it runs out of the MPEM box and have the display handy while you're operating the boat at wot, it will confirm accuracy of your factory RPM gauge and it also has a built in hour meter.

tachometer.jpg

Less than $11.00 to your doorstep: http://www.ebay.com/itm/Tachometer-...Parts_Accessories&hash=item540ea16264&vxp=mtr
 
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This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.
You know i was looking though the service manual. Does the jet pump have anything to do with my rpm problem if so what should i do?
 
You know i was looking though the service manual. Does the jet pump have anything to do with my rpm problem if so what should i do?or does this have nothing to do with it
 
You know i was looking though the service manual. Does the jet pump have anything to do with my rpm problem if so what should i do?

All things being in good order with the seal, bearings and alignment the pump itself is not a usual suspect unless the impeller has been changed. You get a pitch or profile that the motor can't generate enough HP to spin past a certain point and that's as far as your going with it.

It's a very common issue with boater's changing out prop's to a higher pitch dreaming of more hull speed, some of them can't get out of their own way with the throttle buried.

You didn't by chance change from the stock impeller it left the factory with to an aftermarket?
 
Your 30 minutes from me and it's a nice drive South through the orchards to come for a visit, small world sometimes. Sent you contact information as my PM box just overflows here anymore feel free to use it.

The only other thing I might recommend is adding one of these to the boat, it's a single wire attachment that installs by winding the sensor wire around the exterior of the plug wire a couple of times and securing it with electrical tape. I'm not convinced making 42mph over water you're actually losing 1000 rpm's at wot.

You can attach it right at one of the plug wires where it runs out of the MPEM box and have the display handy while you're operating the boat at wot, it will confirm accuracy of your factory RPM gauge and it also has a built in hour meter.

View attachment 27366

Less than $11.00 to your doorstep: http://www.ebay.com/itm/Tachometer-...Parts_Accessories&hash=item540ea16264&vxp=mtr

I had one on order :-D
 
This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.
I changed it to a solas 15/20 per the mechanic at dockside marine. He said this is the impeller i wanted dont tell me this is my problem because i already want to kick him in the ass.
 
I'm almost proud of you at this point. Almost...:) :cheers: You've really done a great job keeping after that boat and learning along the way. Now if we could only find you a new ski project...

Thanks. You guys was the brain in that project, I was the hands. :-) probably a nice photographer :-D


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I changed it to a solas 15/20 per the mechanic at dockside marine. He said this is the impeller i wanted dont tell me this is my problem because i already want to kick him in the ass.

Tell me you still have the original...!? Your boat shipped with PN#204160136 which is an 11/20 pitch, I absolutely would change it back. That's an odd size to, but they had it on your boat for a reason (mainly the weight of the hull).

Grab a seal ring and run it down we'll swap it out and test it.
 
Change the pitch to 15/20 is bad? If so why

That pitch has a much higher inital load right out of the hole than the 11/20, in a perfect world if the engine had enough hp to twist it all the way to 7200 rpms you would make more hull speed faster up to the max rpm point.

My question at this point was did they remove the original factory impeller (if so how was the boat running with it), and did your rpm issue start right after it was changed to the aftermarket Solas?

I'm guessing your troubles started after the impeller change...
 
I do have the original here is a pic of it its allittle dinged up as you can see. Plus a pic of the solas box. I always keep everything and my wife says im crazy what does she know anyway.
 

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The only thing i remember before impeller is the top speed was 47 and now its 42 and when i ski slolom i get up quicker now.
 
I do have the original here is a pic of it its allittle dinged up as you can see. Plus a pic of the solas box. I always keep everything and my wife says im crazy what does she know anyway.

It's relevant to study what Sea Doo did with the 4 tec boat hulls that were made right after your's, on the non supercharged model they kept the starting pitch of 11 and dropped the top end to 19. There's certainly more weight there to explain the drop to 19 though.

I'd say there's a legitimate reason/need for the 11 pitch in the bigger picture of what your hull requires aside from just a strong hole shot.
 
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Ah, yes, I would go back to the original pitch. I think the factory pitch is max for the sportster b/c it was also the same impeller used on the LRV and my sportster doesn't reach red line most of the time, far from it. 6700 is about it most of the time (I think my RAVESs might be sticking some), last year right after cleaning my RAVES on a calm day no other boats out there (fall season) I turned about 6850~6900 and my speedo clocked 50. I'd bet the smaller LRV revs higher and is faster, it has the same impeller!!!

My impeller has been replaced, no idea what's actually in the pump but I know it's not original.
 
Are you saying that this impeller could damage the engine

No, I'm just looking at it from the point of view of your boat being capable of making sufficient HP to turn it at WOT. In the boat world using regular propellers we experiment all the time with different props to find the sweet spot for a boat owner's wants and needs. With just a single fixed pitch variable in a given style of prop it's an easy judgment call when WOT can't be attained, you drop the pitch an inch or two and say hello to the engine and tachometer finally reaching the rpm's needed within a reasonable time frame to get the hull up on plane.

Jet pump impellers aren't quite the educated guess that a 3 or 4 blade propeller is when considering the hull, engine and weight loads, the aftermarket installed on your boat may just not work within the engines ability to make enough power to spin it up past a certain point.
 
Are you saying that this impeller could damage the engine

I think it's holding you back at least some amount. Not hurting the motor necessarily but not allowing the motor to reach it's potential.

I'm actually thinking of going down pitch slightly, for a better hole shot (for skiing) b/c this impeller in mine is barely adequate for me skiing with my slalom ski.
 
No, I'm just looking at it from the point of view of your boat being capable of making sufficient HP to turn it at WOT. In the boat world using regular propellers we experiment all the time with different props to find the sweet spot for a boat owner's wants and needs. With just a single fixed pitch variable in a given style of prop it's an easy judgment call when WOT can't be attained, you drop the pitch an inch or two and say hello to the engine and tachometer finally reaching the rpm's needed within a reasonable time frame to get the hull up on plane.

Jet pump impellers aren't quite the educated guess that a 3 or 4 blade propeller is when considering the hull, engine and weight loads, the aftermarket installed on your boat may just not work within the engines ability to make enough power to spin it up past a certain point.

So the the stock impeller is the only impeller to use in this boat? If that the reason im not breaking 6000 rpms but im able ski easier than im fine with that. I just want to understand(need to know) why the rpms were low if this is the reason and its not hurting the engine than so be it. Getting to 45/50 mph does not matter to me. But i also take care of anyone i own so if this in anyway hurts the engine i will address it.
Also thanks so much for the feedback.
 
Can't say it's the only one, just that there's a reason the factory landed on that pitch it shipped with. You can bet they did plenty of testing under different conditions of passenger weight and towing load and that's what worked the best.

I tossed a high dollar Skat~Trak out of my pump and went back to a brand new factory impeller, major improvement in handling and engine response.
 
I think it's holding you back at least some amount. Not hurting the motor necessarily but not allowing the motor to reach it's potential.

I'm actually thinking of going down pitch slightly, for a better hole shot (for skiing) b/c this impeller in mine is barely adequate for me skiing with my slalom ski.

What pitch r u thinking? And will that not effect rpms?
 
60.00 dollors for a stock impeller its worth changing just see what happens

My thoughts exactly, I burn more $$ in gas than that before noon most days on the lake. You need the neoprene seal ring for the pump also, you can buy three of them from SBT for what the dealer will charge and I would get a new o-ring for the cone to.
 
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