SX/SXi/SXi Pro Factory Pipe tuning

M

mkm492

Location
Central Virginia
I have an Sxi (Twin carb, not a Pro) that came (to me) with a Factory Pipe. I was told that the carbs were rejeted, but there are no other mods, aside from premix conversion. The ski was very fast top end, but kind of a dog low and mid range. I went to the Factory Pipe web site, where they gave instructions for pipe tuning. I can only locate two adjustment screws, and it references 3. Anyway, when I counted turns on the two I could find, they seemed to be bottomed out. I gave them each 1/2 turn open. When I went to ride the thing, it about lept out of my hands. It is stupid fast mid and high, now, but still boggs a little bit on the low end. I splashed water on the pipe and got no sizzle anywhere.

Questions:
Is there a third screw and where did they hide it?
Any tuning tips or base settings for this pipe?

Thanks
 
jetsport484

jetsport484

Are we there yet?
Location
Lake Hartwell, SC
Im guessin you found the top and middle screws. There should be one on the very bottom underneath. you wont be able to see it mounted on the ski, you'll have to feel for it.
 
N3vrSat1sfied

N3vrSat1sfied

Military Member
Location
Fort Worth, TX
i think my top screw is almost all the way out middle screw is flush. and i forget where the third screw is. I know my is set up like any 701 Sj with a factory B pipe
 
M

mkm492

Location
Central Virginia
Thanks, I'll feel around for it. The Factory Pipe web site says the 701 tunes a little differently. Now that I know where to look for it, I can follow their directions for tuning. (Unless anyone out there has a secret formula for an SXi.) This is my first standup and I am amazed at what a squirrely little bullet it is. I haven't totally wiped out going fast, but I'm thinking maybe I should get a helmet on before I do. It's the best mid-life crisis I've had yet, (and cheaper than another woman.)
 
Waternut

Waternut

Customizing addict
Location
Macon, GA
My 750 is squirrely as hell! Reaching top speed on mine is usually followed by a sudden stop and a long swim. The plus side is...you aren't going to hit your head by falling off at speed. You just get whiplash. Most people, including myself, wear helmets because of stabs or various other tricks that can put you between the ski and the water.

I don't know exactly how my pipe is tuned but the middle screw is flush, the bottom screw doesn't exist so consider that closed, and that leaves only the top screw open. The top screw is siezed so I can't count turns for you.
 
M

mkm492

Location
Central Virginia
JJC568 said:
lol, what ride plate do you have on it? my jet dynamics plate made the ski pretty stable, untill i put tubbies on it and lost that high speed stability. All my riding in the surf though so i am ok with that. Check out my build thread http://www.x-h2o.com/threads/42886/post-574337#post574337. if you need anything help let me know. also JFW432 and Sxi4ver are great guys with 750 knowledge as well.
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I put a WORX ride plate on it. It came with a D cut in it. I've only ridden on the lake. All that surf craziness looks like a blast, but I've had to many knee and ankle surguries already. I'll probably stick with little wake jumps and other low risk tricks. I am totally addicted to stand-ups now. What a rush.
 
M

mkm492

Location
Central Virginia
jfw432 said:
My 750 is squirrely as hell! Reaching top speed on mine is usually followed by a sudden stop and a long swim. The plus side is...you aren't going to hit your head by falling off at speed. You just get whiplash. Most people, including myself, wear helmets because of stabs or various other tricks that can put you between the ski and the water.

I don't know exactly how my pipe is tuned but the middle screw is flush, the bottom screw doesn't exist so consider that closed, and that leaves only the top screw open. The top screw is siezed so I can't count turns for you.
Click to expand...
My original settings were what you seemed to have. When I gave them both 1/2 turn open, the ski really woke up mid and high. I'm looking for a little more crack on the low end. I'm going to leave the pipe be for now with what I got, and try adjusting the Low speed screws on the carbs. The plugs seem to be showing rich, but I think that's from the High speed screws, which I'll leave alone.
 
FlightRisk

FlightRisk

Location
Kansas City MO
mkm492 said:
I put a WORX ride plate on it. It came with a D cut in it. I've only ridden on the lake. All that surf craziness looks like a blast, but I've had to many knee and ankle surguries already. I'll probably stick with little wake jumps and other low risk tricks. I am totally addicted to stand-ups now. What a rush.
Click to expand...


What difference did you notice between the D cut and the WORX plate? I was riding some R&D ride plate....porposes bad but carves well. I recently D cut my stock plate, and the porposing I was having seemed to be reduced greatly, no breaking effect either but the ski slides REALLY EASY.
 
M

mkm492

Location
Central Virginia
The ski came with a carbon fiber ride plate that was not attatched, and ended up not fitting. I did a little research on this site and went with the recommended WORX ride plate. It came with a D cut in it. It porpoised real bad (probably because I suck as a rider-being my first standup.) I shimmed the back of the plate with 4 washers, and the porposing went away, but it was not carving as well. As I learned how to ride a little better, I removed two of the washers. With the washers in, I was able to get the nose under for subs. Now it seems harder, cause I haven't been able to do a sub since. I'm hoping with my new found lower speed power, I'll get it to pull me under again. (If I can improve my technique.) Thats why I want to get more low end power. I need to find out more about a timing advance plate.
 
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