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  1. kevbo

    Superjet sponsons crazy at high speeds

    That design will pull down whenever they touch smooth water, you wont notice it nearly as much in rough water though. Mounting them a little higher will keep them dry when doing speed runs on glass. They will still work the same when you lean and turn.
  2. kevbo

    Custom/Hybrid B-Pipe to Power Factor Pipe carb jetting

    Your pilot is probably rich enough if it sputters a lot at 1/4 throttle. Always open the top screws until power declines and lean from there.
  3. kevbo

    disappointed with my new blaster

    Its over propped. Repitch the impeller and bore the nozzle, that will do a lot for response and acceleration.
  4. kevbo

    Freestyle Spinning Impeller or Cavitation

    If you have an air leak or protrusion like grate bolts, it will vibrate wihile underway at mid to high power. A large hub that is too flat tends to struggle when the ski is first dropped in and not moving forward..
  5. kevbo

    Super Jet Cnc porting top ends

    CNC porting with the sleeves installed requires expensive equipment. Removing/reinstalling sleeves is too time consuming. It is much easier to use hand tools and pay yourself $100/hr. It not like the customer knows what he wants or what he is getting anyway.
  6. kevbo

    Other Autoclave

    Nearly all resins/adhesives contain volatiles that create porosity, this lowers compression and bending strength. Leaving vacuum on the part makes it a lot worse in some cases. It is better to cure with positive pressure with the bag vented, even if you can get only 10PSI. No need to worry too...
  7. kevbo

    Fundamental differences between entry level (or any for that matter) A/M hulls.

    Good luck finding measurements or tech info on anything ski related. MFGs dont provide any and customers simply dont ask. You end up with internet forums full of customers that are either happy or unhappy with their purchase for whatever reason.
  8. kevbo

    Single carb vs dual

    I meant the amount of throttle opening required for the pipe to find resonance rpm. All else equal, a small carb will be opened more than a larger one at this reference point or any rpm below full power.
  9. kevbo

    Single carb vs dual

    I did a test between single 44 and twin 44s on the same engine. The single required 50% throttle to hit the pipe. Twins hit around 40% open. The twins needed to be set richer at part throttle for best response and consumed 15-20% more fuel for surf type riding. The twins made the pipe hit a...
  10. kevbo

    Is this a "Lowered Pole Bracket"?

    I was poking fun at pop culture of a different time and place.
  11. kevbo

    Custom/Hybrid Tuning: staggered jets

    If both carbs are identical the difference between cyls should be slight. Normally one plug will be cleaner than the other. It was common for Seadoo 580-720 and Yamaha 701+ to have a hotter rear cylinder. I tuned two Kawasaki 750s that both had hot front cylinders. Factory 760s had a larger main...
  12. kevbo

    Single carb vs dual

    A big single is OK for freestyle use. I would not recommend one for long full throttle use since they have a tendency to slowly go lean.
  13. kevbo

    wax question

    Disposable foam earplugs.
  14. kevbo

    Is this a "Lowered Pole Bracket"?

    Use a lowered bracket if you drive a Honda and a raised bracket if you drive a truck.
  15. kevbo

    Your thoughts on Solas mag pump stator

    The performance gain is in traction only, they keep working when a stock pump looses thrust. A large hub impeller in a stock pump is about 40% improvement in hookup. The Solas stator makes it complete.
  16. kevbo

    What would cause this?

    Look for missing bearing retainer. It could be detonation it is usually more of a frosted appearance. Also bores this large tend to stick rings before piston tops look that bad.
  17. kevbo

    Yama Mikuni SBN 44mm Max jet size?

    He should be able to slow peak RPM by opening the top screw. Otherwise there is a restriction upstream.
  18. kevbo

    Super Jet Solas Mag Pump Ate My Bearings- How About You?

    A 1205 cant handle much axial (thrust) loading.
  19. kevbo

    Yama Mikuni SBN 44mm Max jet size?

    The main jet hole is huge compared to any jet. I ended up with a 160 and 2 turns out on a stock 44/61X case under a high port 701. You may very well be choking a little at the needle or even at the basket. A 2.0 N/S has more area than all downstream orifices so I always use this size or larger...
  20. kevbo

    Upgrading to solas mag pump, performance or prop change needed?

    A 62T cyl will probably be a little sluggish with a 10-16. If it is just bend the trailing edge 1/8" and try again.
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