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  1. kevbo

    Freestyle Affordable Power......... It's COMING

    Maintenance in the jetski world occurs sometime after it quits running.
  2. kevbo

    Blackjacks

    The big engines can move enouth air to make a true bore carb work. A small engine, especially single carb can be difficult to tune for sustained full throttle. Use a standard SBN46, it has a smaller venturi that is more forgiving on single setups.
  3. kevbo

    Blackjacks

    A 46 will feel more responsive than a standard 44. This mod is most beneficial after port work and a low pitched impeller, otherwise a waste of time/money. Since you are value conscience, get a good pipe, port work, and the best pump/prop you can afford. Carb mods are very expensive for what you...
  4. kevbo

    Super Jet Help with piston wash

    Spotless pistons are mostly a standup thing. They spend a lot of time at part power and must be tuned very rich in this range for good response. A peaked out sitdown will have clean plugs and dirty pistons.
  5. kevbo

    Super Jet Help with piston wash

    It is common to see dark plugs and clean pistons in standups that arent getting much full throttle use.
  6. kevbo

    Engine Air Supply

    If you look carefully you will see the flat sides of the hull move inward slightly when the throttle is blipped. It will do this even with large hood vents. The hull inlet does not need to be as large as the carbs because intake pulses get averaged. I you are getting a lot of oil canning and...
  7. kevbo

    Hotter front cylinder

    Are you talking water temp or combustion temp?
  8. kevbo

    Remote fuel pump mounting ideas

    It is best to mount the pump above the case so no liquid can get trapped in the pulse side.
  9. kevbo

    ported cases

    This is the first time I have found fetskiers comparing the size of their holes.
  10. kevbo

    sbn 44 jetting heeeelllllllllppppp

    Make sure it sputters some at 1/4 throttle and tune the top screw for best full throttle acceleration.
  11. kevbo

    Other AVGAS LL100 info for the poorride community (unable to buy C12)

    I dont run premix in my car either so WTF.
  12. kevbo

    Other AVGAS LL100 info for the poorride community (unable to buy C12)

    The TEL in avgas will raise octane faster at lower mix ratios.
  13. kevbo

    Freestyle Looking for 62t 760 freestyle specifics 64x Decking Porting

    The top screws supplement the main circuit. Are they closed?
  14. kevbo

    So this is what the X has come down to

    All internet forums are like this, they always have been and always will be. People spend about three seconds forming an opinion and then spent the rest of their lives defending it. It is a lot better now than before the internet, when we had to rely on a shop or magazine to get information. It...
  15. kevbo

    62t motor carb settings

    Are you sure its not over loaded.
  16. kevbo

    Superfreak sunk and recovered 36 hours later..

    Scuppers=sinkers. Plus, its owner was sure that it wouldnt happen. Im waiting for a hull to banana peel from an internally vented tank.
  17. kevbo

    Super Jet Ewci for superjet worth it?

    They can make a substantial difference on a setup that has too much prop and/or low compression. If you are not racing, get a low pitched impeller and bore your nozzle.
  18. kevbo

    Kawasaki 650 to 750

    A 750sx E-box will fit perfectly mounted flat over the battery. You will need to make a bracket or box around the battery. A stock twin carb flame arrestor is too big. A 650 stator and cdi will work ok for low port 750SX cylinders.
  19. kevbo

    Other Crank bearing crush?

    Look for .002" interference at 70*F. Case/bearing fit gets no attention because its not a problem, even when they are severely worn. All wear can be eliminated with careful surface prep and loctite. It really doesnt matter, I saw a set of horribly chaffed cases on a race engine that never...
  20. kevbo

    milling stock head help

    The squish needs to be recut once its milled enough to make a difference. I have taken one down to the squish and still had .070 with a stock gasket but the squish casting is not very accurate.
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