SX/SXi/SXi Pro A sad day Hydrolocked

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mitco39

Location
Edmonton Alberta
Hey guys,

I bought this thing and had it 3 weekends, every weekend I got about an hour on it before something broke ending my weekend. I finally got it running great and was practicing some turn subs just like I watched on the videos posted on here a bunch and this is what happened.

456909_10151818178370507_936628115_o.jpg


Upon looking at it closer one of the ducts that stick to the front of the hood fell off, so as soon as it went under water instead of dropping the water down past the carb it dropped it right onto the carb. So back to the drawing board. Can anyone tell me if that crank looks like a hotrods? might see about getting this one rebuilt so I have 2 of them around.
 
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mitco39

Location
Edmonton Alberta
Thats the plan, I need atleast a piston as well. But I am going to get 2 new ones and run a quick hone through the cylinder. The issue is SBT doesnt have +2mm pistons they only carry up to +1.5mm, it looks like I will have to go through wiesco for them.

Also when I pulled off the hood one of the hose ducts that run down the front of the ski fell off and it looks like it allowed the water to dump right on top of the carb. I am pretty sure thats what happened because I was doing a bunch of subs the day before without very much water at all getting in. I am running spark arrestors but no filters.
 
Cannibal

Cannibal

Tasty Human
Location
Summit Lake, WA
So is that a small pin or big pin?

I'm not sure why they don't list big pin up to 82mm like they do with small pin. If that's an early big pin, hold off on ordering. Maybe someone else will chime in and verify what I believe to be correct. I'm second guessing myself here.
 
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mitco39

Location
Edmonton Alberta
I know that the pin diameter for these pistons is 20mm which I got off the weisco website after googling the part number stamped on the piston.

http://www.wiseco.com/ProductDetail.aspx?AppID=&ItemID=813M08200&ModelYear=&ModelID=

So a small pin 82mm should work just fine I would think. I am going to order a sbt crank and that should do it. I am rather surprised at how cheap parts are for these engines. Would you recommend running a prefilter on the outside of my spark arrestors to help keep the water out?
 
Cannibal

Cannibal

Tasty Human
Location
Summit Lake, WA
Yep that's a small pin, makes things easy for ordering, however, see what you can find on the machining specs for each of those pistons.

I believe that Wiseco's that you currently are running have a different machining spec for the cylinder boring. If I remember correctly, the cast pistons need a larger bore because they expand more, so going from a forged Wiseco to a cast Pro X might need a light bore. Verify this though. I'd hate for you to order up some Pro X pistons and have them be too small for your current bore.

Best bet is to control the water getting into the hull first and foremost. Get different hoses that actually go up into the hood to about a half inch from bottoming out into the hood cavity. Then run them as long as possible into the bottom of the hull. Get a good 500+ gpm bilge pump and run that along with your factory siphon pump.

The prefilters do help keep some water out of the carbs, but really, the stock box works better.
 
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mitco39

Location
Edmonton Alberta
Cannibal,

Thanks for all the heads up, I will call to confirm with atlantic jet sport. Do you know of a say a hood retrofit that I could buy and install? I will take some pictures when I get home from work this afternoon and maybe you could give me a few pointers. The ski does currently have a 500gpm bilge on it that is manually operated. I turn it on after every wipeout (I dont want to leave it on because the ski has a total loss ignition system).

Thanks a bunch!
 
Cannibal

Cannibal

Tasty Human
Location
Summit Lake, WA
Not a prob. There is no "kit" that I know of. Many of us go to Home Depot or the like and get some bulk tubing. You will see some stuff made for "Pool and spa". It looks like this stuff, sometimes a different color, but still spiral:

http://www.homedepot.com/webapp/wcs...alogId=10053&R=202257712&catEntryId=202257712

Use what you can find in bulk in your area. You can use 3M 5200 or similar to glue it into your hood.

As far as bilge, there are actually plenty of people that leave their bilge pump on the entire time they ride with total loss and say they can get a whole weekend of riding. Some will charge the battery over night, but most bring a back up battery just in case.

At a minimum, I'd turn it on prior to doing any underwater tricks like subs, stabs, fountains, etc.
 
R

Roger

Location
Clemson SC
Could be wrong , but I think you set up a forged piston looser than a cast. The forged piston (Wiseco) expands more than a cast piston (WSM,Pro-X).
 
Cannibal

Cannibal

Tasty Human
Location
Summit Lake, WA
Roger said:
Could be wrong , but I think you set up a forged piston looser than a cast. The forged piston (Wiseco) expands more than a cast piston (WSM,Pro-X).
Click to expand...

I couldn't remember which way it went. You might be right. He needs to get the bore specs from each piston and have his cylinder measured just to make absolutely sure. Now that I think of it, I want to say the Wiseco pistons run .006 and cast is .004 or .0045 or something like that, which makes sense.

Unfortunately, most argue that 82mm is the limit of those cylinders, or I would have suggested a complete bore. It has been argued that they are good until 83mm, but going to 83mm is going to require Wisecos, and he's trying to save a buck.

mitco, you might just want to order that one replacement Wiseco piston since you say the cyl just needs a hone. Maybe a set of rings for the other, hone both and run it. Just know that the next time it blows, it will probably need a cylinder.
 
PWCSAR

PWCSAR

River Rat
Location
Wa
That sucks,

I'd try to find another (or OEM/stock bore) cylinder sooner than later, gettin kind of thin at 2 over IMO... I have an extra but it's at 2 over , they just get kind of thin past that.. I'll have to go look,

Edit: just checked, my first cyl off my small pin was at 81.5 but the vertical gouge was in the lower/thin part of the sleve. Went back to a stock bore after that.
 
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mitco39

Location
Edmonton Alberta
Thanks for the info. I was looking around and might just go with the SBT built engine, has anyone had any good or bad things to say about it?

http://www.shopsbt.com/kaw-1994-750sx/P40-20.html

They said it comes with 2 year warranty that covers everything from water in the engine to blown pistons from running to lean. I wont be able to change out the head if I want to keep the warranty but at this point the ski is plenty fast for me now anyways. He said I can change everything else on it (put on my total loss, exhaust, carbs, ect). It would take all the guess work out of doing this myself atleast right now. Then if I decide I want more power I can just swap out the head and void the warranty.

Any Thoughts before I go ahead and do this?


Thanks guys

Mitch
 
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mitco39

Location
Edmonton Alberta
Also can anyone tell me if this is a stock part or what it is? Who ever had the engine before me had the reeds sitting in this.

pic1.jpg


One of them looks to be in ok shape, the other looks very deteriorated.
 
PWCSAR

PWCSAR

River Rat
Location
Wa
It's a reed stuffer of some kind?? Brand unknown?
 
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