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  1. #1
    PWCToday Regular johnlam940's Avatar
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    Apr 2008
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    Cen Tex
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    34
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    66

    What causes new reed petals to break?

    Hi Everyone, I have a 96 Waveblaster 2 760 that has been a nightmare to sort out. Every time I tear into it to fix a problem, I find 2-3 other problems to fix. Here's a quick run down:

    -150/145 psi compression
    -Spark plugs have about 10 hours on them and are dog poop brown in color
    -All stock except choke removed and the turn down air intake hose is missing from the plastic intake/carb cover
    -Freshly rebuilt carbs w/ the SBT kit
    -New seat and needle (1.5)
    -Trying different pop off settings
    -New fuel lines
    -New crank seals
    -Premix @ 43:1
    -Eliminated fuel selector that was leaking (Plumbed w/ shorter lines now. Tank -> shut off valve -> filter/separator -> carbs)
    -New fuel filter/water separator
    -New aftermarket fuel tank check valve (holds pressure....maybe too much? Does the OEM check valve vent if pressure is too high?)
    -Factory carb settings (1-3/4 low, 1/2 high) and factory jets
    -Removed fuel tank and cleaned
    -Replaced reserve fuel pick up hose
    -No tach so no RPM data available
    -Did not have means to do a leak down test when I had the engine out


    Current problem:
    After addressing all of my problems I've found, I replaced the reeds because they were chipped/broken. I go to the lake and I get intermittent bogging on the low end. Sometimes it will stutter and clear out after feathering the throttle, sometimes it would just die after hammering the throttle. No obvious signs of backfire. Top end was awesome though, very strong. I think my pop off was high 40s.

    I go home and tear into the carbs and lower the pop off to around 30psi. Out on the lake I get awesome low end with extra crisp throttle response but a very weak top end (felt like I lost 5 mph) and it became harder to start throughout the day.

    I go home and see that the fuel tank is holding a lot of pressure. It blows the cap off with a decent amount of force when I open it. So I'm thinking high tank pressure is causing fuel to leak past the needle so I change my pop off to around 40 psi. I decided to check my reeds and find that one petal has a huge chunk missing from it and 2 other petals have the tips broken off. These reeds had less than 10 hours on them.

    Are these petals just really sensitive to breakage from a ski that isn't running 100%? I'm getting super frustrated with chasing problem after problem. Any advice before I take it out to the lake again with new reeds? Thanks for any help!
    Last edited by johnlam940; 07-30-2018 at 04:24 AM.

  2. #2
    I dream skis
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    Jan 2007
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    Re: What causes new reed petals to break?

    Are you using oem reeds ?

  3. #3
    PWCToday Regular johnlam940's Avatar
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    Re: What causes new reed petals to break?

    I'm using reeds from SBT.

  4. #4
    I dream skis
    Join Date
    Jan 2007
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    Re: What causes new reed petals to break?

    Try some Oem Yamaha

  5. #5
    PWCToday Regular johnlam940's Avatar
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    Apr 2008
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    Cen Tex
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    Re: What causes new reed petals to break?

    I'll go OEM if they break again but any idea on why the SBT reeds failed so quickly? Backfire? Bouncing off rev limiter? Water splash being sucked into the engine? Cranking a flooded engine due to leaking needle?

  6. #6
    Top Dog Benflynn's Avatar
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    Aug 2015
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    Birmingham
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    1,608

    Re: What causes new reed petals to break?

    Or everything sbt sell is garbage, or enough is you can't trouble shoot around it

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