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  1. kevbo

    Superjet blowing out ADA o rings

    Its unlikely any manufacturer will improve anything that was designed for an out of production vehicle. The problem can largely be fixed by lapping the deck and possibly shimming domes. Sometimes a new complete head is necessary.
  2. kevbo

    Has anyone put a Yamaha 701/760 in a SXR800 hull?

    Its the pump more than the engine.
  3. kevbo

    Unequal cylinder temps on tpe 964

    You basically have two engines that are tied together. Tune each cylinder individually.
  4. kevbo

    Other Best or better?

    Use the stock box whenever possible unless you just want to make noise. Factory "B" and type 4 dry pipes work at lower rpm so they are more versatile, they will work well with pump gas and stock ignitions. Most laydown pipes are shorter and work at higher rpm when run dry. This makes it more...
  5. kevbo

    Flywheel balancing?

    I was thinking crankwheels designed for 77mm pistons. They are much lighter than stock 84mm pistons. The engine is soft mounted so ideally it should gyrate evenly on both ends.
  6. kevbo

    Flywheel balancing?

    An out of balance flywheel could be beneficial if its at the right place. Our cranks were originally designed for pistons much lighter than the giant slugs we all use today.
  7. kevbo

    Flywheel balancing?

    On a solid part, balance wont change as its rotated. And, in the jetski world, nobody cares. Everyone knows the name on their carburetors, no one knows the area of their exhaust port or their engines peak RPM.
  8. kevbo

    b pipe ski vibration

    All my two cyl skis have a noticeable vibration zone around 1/4 throttle. The engine doesnt shake any more but the hull resonates at this frequency. The weight of the stock pipe prevents the engine from moving as much so it feels smoother. Engines really shake with a dry pipe/manifold since...
  9. kevbo

    Has anyone put a Yamaha 701/760 in a SXR800 hull?

    You will need some kind of tuned pipe in order to get a 760 to make any power. The stock Superjet exhaust will hurt higher port cylinders more than ones with lower port timing. Plus the smaller Kawasaki pump needs more power and rpm to make the same thrust than a Yamaha pump can at low speeds...
  10. kevbo

    Lithium batteries... are they safe

    LIPOs got a lot safer as smart chargers became widely available. In the beginning everyone I know torched one with a nicd charger. They are still power kegs if mishandled. I have a bunch of large 3 cell packs, I may make an external box and see how well they work.
  11. kevbo

    Lithium batteries... are they safe

    All the consumer stuff uses LI-FE cells, those are relatively safe LI-PO batteries are very dangerous by comparison.
  12. kevbo

    Super Jet advice on what to do next

    You have a 19 year old ski that has not been maintained.................. They aren't making enough new units so nearly everything available is in similar condition. What do you do next? Either dump the ski or spend a lot of money.
  13. kevbo

    Nose cones

    The main benefit for yamahas is sealing water out of the threads, Kawasakis are much more crutial because of splines.. I glue the rubber cones in with silicone. This kind of atention to detail pays off over time. Your grandkids may want to change the prop thirty years from now.
  14. kevbo

    Career out of High school

    I worked in engineering for a few years. Those guys were (for the most part) very intelligent. Extremely rare to find one who can ride and wrench though. Probably from lack of interest and/or being too fat as a kid.
  15. kevbo

    Career out of High school

    Theres definately an element of that, like protecting guys that either cant show up or show up drunk. The union came in handy when an A-hole supervisor threw the contract at me and said "where does it say I have to be fair"? I smiled, threw it back and said "where does it say I have to do any...
  16. kevbo

    Career out of High school

    People are extremely subjective. When the boss likes you, every skill you have and everything you know fall into place like magic! Its entertaining to watch management tout the accolades of "their" chosen ones then turn around and scapegoat anyone they dont like. Its really funny when a union...
  17. kevbo

    Career out of High school

    Sounds like a trade school recruitment commercial. No blue collar job requires formal education. Its unwise to spend time and money for education if its not required or even valued. The number one most important thing is your relationship with the owner or boss. Without nepotism status, you are...
  18. kevbo

    650/X-2 X2 build help!

    1208 is used because its cheap. Jetski hulls are subject mainly to bending loads. The finish treatment of the fiber is most important since the primary load is interlaminar shear. A plain weave tooling cloth with the proper finish is easy to use and next cheapest compared to 1208. 7781 cloth is...
  19. kevbo

    solas 14.7-18.5 is this too tall for a stock 92 snsj

    Excuse the thread drift. They should have kept a stand alone X2 class, it was the most accessible for beginners and at the same time, very popular with older guys. The racing organization sold out a lot of participants and ultimately destroyed the whole class.
  20. kevbo

    solas 14.7-18.5 is this too tall for a stock 92 snsj

    I tried the 14-17 "S" prop. It was still a bit much but required little bending to find max thrust. Most Solas impellers run from too steep to way too steep for stock cylinders ported or not. The only ones that I found useable out of the box were the 9-15, 11-16, 12-18 Kawasaki Concords. For...
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