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  1. kevbo

    Anyone heard of an opposed Piston, opposed cylinder engine? Its a two stroke.

    Its common for aircraft engines because they weigh and vibrate less than other arrangements.
  2. kevbo

    can a starter be removed without taking the motor out?

    Make sure to connect the cable before you reinstall.
  3. kevbo

    Superjet/FX1 CDI modification

    The pictures show how to eliminate the limit. The resistor just below (closest to the edge) is what is changed to raise the limit.
  4. kevbo

    Timing ?

    The few that actually measure timing are. Its not very practical or necessary for stock electronics set at factory marks.
  5. kevbo

    The physics of tow rope strength?

    I have towed many skis through rough water with a 1/4" nylon rope. In smooth water the strength needs to be only slightly greater than the thrust of the tow ski. Rough water greatly increases the peak load. Nylon will stretch enough to smooth out the shock loads if the rope is long enough.
  6. kevbo

    Superjet/FX1 CDI modification

    Just replace the 91-100k resistor with a 70-75k and seal up the box. This will get the rev limit up to 7300-7500. Lower resistance raises rpm. Why would you want to eliminate the rev limiter on a watercraft?
  7. kevbo

    group k 845 big bore

    Dont get a big bore if you plan on running full speed on pump gas. Big bores are for throttle response, and something to brag about. A ported 62T cyl at 82-83mm will make all the reliable power you can get on pump gas.
  8. kevbo

    08 wammer/XSream-SS846

    Where's the muffler?
  9. kevbo

    Broke another timing key

    Tighten the flywheel bolt more.
  10. kevbo

    Wetjet Kraze

    There was a major recall on the early 701 Wetjets. The kit had half of the parts needed to make a ski. New steering head, pump, seat pan, etc. 96+ models had all the updates. They were good performing boats with lots of maintenance issues.
  11. kevbo

    Installed hooker...now cavitating?

    Make sure the grate bolts have not poked through the shoe. This will cause vibration and make the pump seals leak over time.
  12. kevbo

    best possible stock pump and nozzle setup for a big bore or stroker

    I agree, thats why Im planning to try a 155 with matching inlet. Already been proven in the Blaster 2.
  13. kevbo

    best possible stock pump and nozzle setup for a big bore or stroker

    Everything we have is designed as a bolt-on part for racers. We are just now getting larger, low RPM engines but are still using existing pumps/inlets. There is not much enthusiasm or money flow going into anything but big carbs, big engines, and carbon fiber. Dont expect much new development...
  14. kevbo

    best possible stock pump and nozzle setup for a big bore or stroker

    My only experience with a Mag pump showed exeptional piriming, I didnt do any work with with it. Nobody is posting much top speed gain with Mag pumps so their pressure potiential over stock must be minimal.
  15. kevbo

    best possible stock pump and nozzle setup for a big bore or stroker

    Your 62T cone at 85.5 is about as good as it gets as long as the prop load matches the engine. Anyone getting more/less thrust by changing the pump is just finding tune with the engine and not actually making the pump any better.
  16. kevbo

    Looking for better underlayment foam

    That EVA floor mat is great, same stuff thats in running shoes. Lighter than neoprene yet more firm.
  17. kevbo

    does anyone know how to select an impeller

    First you need to find the full throttle RPM between 20-35 mph.
  18. kevbo

    Wet jet parts = SN Superjet parts?

    The WetJet pump and shaft wont fit a Superjet.
  19. kevbo

    stock waveblaster 1 prop

    Too much load.
  20. kevbo

    question about fx1

    The pump will have to be changed to get any thrust in an FX1. Otherwise all standups are like beer, whatever you like is good.
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