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  1. Replies
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    25,239

    Re: Polaris MSX 150 - IFB

    Welcome. Instructions, videos or books about??? the Polaris MSX 150? They are a rare, 1-year only craft from a manufacture that hasn't made pwc since 2004.
    Best source of Polaris knowledge......
  2. Replies
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    564

    Re: Rebuilt jet pump lasts an hour

    Thanks for the confirmation. I suspected that was the case regarding the concave area in the rear of the stator. The impeller shaft and thrust washer were both cupped into that concave area...
  3. Replies
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    564

    Rebuilt jet pump lasts an hour

    Hi Gang,
    A friend recently picked up a nice '96 GTX. It has no thrust and bad jet noises so he had me take a look. I pulled the pump and it was a mess. The needle bearings were destroyed. The...
  4. Replies
    3
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    1,334

    Re: Carb issues 750 slt

    Hard to see clearly where all the lines are going... assuming the IN line is looping around behind the mounting bracket... it does appear you are plumbing it in correctly.

    How are you determining...
  5. Replies
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    25,239

    Re: Polaris MSX 150 - IFB

    The System Interface Box (SIFB) is a mushroom shaped module that plugs into the wire harness above the battery... below the ECU. If you're having starting/stopping or rev limiting at 3400rpms......
  6. Replies
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    25,239

    Re: Polaris MSX 150 - IFB

    Thanks for sharing the SIFB bypass trick. Definitely useful for troubleshooting.

    The OEM SIFB in addition to reverse rev limiting also has an auto-powerdown feature where after ~2mins with the...
  7. Replies
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    4,331

    Re: SL780 head torque spec

    Polaris Fuji (blue) engine 650/750/780

    Crankcase Bolts (8mm) 16ft.lbs.
    Crankcase Bolts (10mm) 26ft.lbs.
    Cylinder Head Nuts (8mm) 18ft.lbs.
    Cylinder Base Nuts (10mm) 28ft.lbs.
    Carburetor...
  8. Replies
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    8,382

    Re: My msx 150 smokes at idle

    Welcome. Rare and expensive-to-fix ski you got there. I'm pretty familiar with them myself. When they run right... they are awesome... great power and great on fuel... in a very well regarded hull...
  9. Replies
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    11,022

    Re: 2004 MSX 150 oil change

    Have you checked the O2 sensor? If this is faulty, it will mess up idle and I've heard one fellow report it caused a ~5900rpm limit by the ECU. He replaced his O2 and had his codes cleared (dealer...
  10. Replies
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    11,022

    Re: 2004 MSX 150 oil change

    That idle is high. Webers idle steady at 1500-1550. I suspect a leak in the rubber boot that connects the throttlebody to the intake manifold. I've even seen a pic of a puncture/tear in this...
  11. Replies
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    11,022

    Re: 2004 MSX 150 oil change

    The flush kit "Tee" goes in the hose from the heat exchanger to the bottom of the oil tank. It's way down in there. This this tread for Polaris install PDF attachment....
  12. Replies
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    11,022

    Re: 2004 MSX 150 oil change

    Yeah... most attempts at cleaning the MAP sensors doesn't seem to work... but worth a try. I can see where the intake MAP might be worse... if a good bit of oil was ingested and pooled in the intake...
  13. Replies
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    11,022

    Re: 2004 MSX 150 oil change

    Welcome!
    By "cleaning out"... I'm guessing you mean after your engine has ingested oil... likely due to either: overfilling the oil, ski rollover, or water leak into oil (usually oil tank leak)...
  14. Replies
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    1,621

    Re: What kind of 650sx flywheel is this?

    Thanks guys!

    Sounds like my stator is on and aligned properly... so I'll button up the front again and continue my checks into other causes. Grounds, carb (possible main jet blockage), fuel tank...
  15. Replies
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    1,621

    Re: What kind of 650sx flywheel is this?

    Thanks for the fast reply!

    The replacement stator was same as original... so same number and color of wires. All wire colors matched up. The 2 yellow ones I assumed didn't matter which of the 2...
  16. Replies
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    1,621

    What kind of 650sx flywheel is this?

    Hi Gang,
    My '91 650sx lost spark. I replaced the CDI/coil and still nothing. So I replaced the stator. Mine was black and toasty looking... the replacement was very nice looking.

    So this was...
  17. Replies
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    1,474

    Re: Polaris MSX150 Overheats more than normal?!

    If you did remove it... those chopped up weeds that passed through your pump would get sucked up into the fresh water system. First stop... the intercooler. I would not recommend it. Overtime you...
  18. Replies
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    5,378

    Re: 650sx can't be ridden fast... porpoises badly

    Wow... that's a serious plate extension! Looks like you gotta watch the shins on that puppy.

    Well... thanks to Lomofo... I now have an Ocean Pro Race plate and an R&D top loader grate. Put them...
  19. Replies
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    5,378

    Re: 650sx can't be ridden fast... porpoises badly

    I've installed a 145main, 115pilot, 2.0 n/s, black spring (80g) and have popoff at 22psi.
    I have both mixture screws set to 3/4 turn out. (I've set the low mix based on testing... but I haven't...
  20. Replies
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    5,378

    Re: 650sx can't be ridden fast... porpoises badly

    Thanks for the advice gang!

    I'm sure it's mostly an experience issue like many of you point out... just need more ride time to learn the proper positioning and throttle.

    Was talking with my...
  21. Replies
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    5,378

    650sx can't be ridden fast... porpoises badly

    Hi Gang,

    So I got my 650sx back on the lake this season and it's been running great since you guys helped me dial in the proper settings for the SBN-44 carb.

    This year I want to tackle the...
  22. Replies
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    Re: 2004 Polaris msx1100 axcell problem

    I'd be curious what the boat guy did when it was "gone through". I'd bet it's way too full of oil. Remedy that first. I like to pull the wire connector on top of the fuel tank for the fuel pump...
  23. Replies
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    9,164

    Re: 2004 Polaris msx1100 axcell problem

    That's great compression! But yeah... oil sounds off. How long did the engine get run before the problems? I ask cause sometimes oil will have a little condensation in it and appear a little...
  24. Replies
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    9,164

    Re: 2004 Polaris msx1100 axcell problem

    If we could read the codes without the Polaris dealer-only digi-wrench... then it would be easy to figure out what's tripping up the ECU. Yeah... it's definitely an ECU limp mode or problem... since...
  25. Replies
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    1,302

    Re: how to make a home-made pop-off gauge

    I like it! Thanks for the details.

    I made one similar... used a lower pressure gauge so I could better read it between 15psi - 20psi... the range I set pop-offs at for my Polaris carbs.
    ...
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    Re: 2004 polaris msx 110 turbo problems

    Hi Budman,
    The vast Polaris online presence has migrated over to Greenhulk (dot net). There is a very good Polaris-MSX/Matrix section that has good posts and information about our Weber-engined MSX...
  27. Thread: 2004 msx 150??

    by ripcuda
    Replies
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    17,493

    Re: 2004 msx 150??

    Polaris' last year for manufacturing PWCs was 2004. That was also the debut year for the "all new", 1st Polaris 4-stroke PWC, Weber-made 750cc twin cylinder intercooled and-turbocharged... 2004...
  28. Replies
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    6,862

    Re: replating weber cylinders

    Old thread... but I wanted to update it with recent information... in-case folks are searching.

    I've been working with Randy (user RJ above) at WeberPower (dot com) to fix one of my Weber blocks...
  29. Replies
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    25,239

    Re: Polaris MSX 150 - IFB

    I realize this is an old post... but in-case others stumble across this wondering the same...

    The System Interface Bus (SIFB)... is a part no longer available from Polaris. And it's a pretty...
  30. Thread: turbo ski

    by ripcuda
    Replies
    1
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    4,584

    Re: turbo ski

    Howdy. That compression is bad. I'd bet you have either failed nikasil plating in the cylinders (more likely), warped block from bad overheating (less likely) or a blown headgasket (less likely). ...
  31. Replies
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    1,887

    Re: 650sx with mods... need carb tuning advice

    Based on your recommendations... I've installed a 145m, 115p, 2.0n/s, black spring and have popoff at 22psi. I set both mixture screws to 1 turn out to start. I also rebuilt the fuel pump side of...
  32. Replies
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    Poll: Re: sbn44 carb help

    Hey direwolf... my ski sounds very close to yours in mods. I too am rejetting my SBN44 from the stock (125m,100p,2.3n/s,65g) to the same as you (145m, 115p, 2.0n/s,80g).

    What are your High/Low...
  33. Replies
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    Re: Westcoast dome identification

    Great info!

    I have 7030 domes on my Westcoast 7500 head (650sx). My compression is 158F,153R.

    Does this compression require premium 91 octane?
    Or can I run 87 or 89 octane?

    Thanks!
  34. Replies
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    1,887

    Re: 650sx with mods... need carb tuning advice

    Appreciate the advice!

    I've got a good 2.0 needle valve/seat and a black Mikuni spring to use. So, I've ordered a 145 main and 115 pilot jet.

    What should I set my High and Low mixture screws...
  35. Replies
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    1,887

    650sx with mods... need carb tuning advice

    Hi Gang,
    Just got out my wife's '91 650sx standup this weekend. We bought it early last season. It runs fine once warmed... but I always have to peg the throttle (WOT) when starting... like it's...
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