SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    Jan 2002
    Posts
    586

    Default This is starting **** me off

    At 270 hours my GP1200 detonated due to creased fuel pump check valves.
    Put on a new SBT top end and rebuilt the carbs including new throttle shafts.
    Ran like a champ for 30 hours. Yesterday anything over half throttle and the
    RPM's would drop. Took carbs apart and the check valves are creased again What going on here?

  2. #2
    Joined
    May 2003
    From
    Houston, TX
    Posts
    372

    Default Re: This is starting **** me off

    I feel your pain...

    Seriously, I agree with you and don't understand how Mikuni gets away with it. TS says that carbs have wear parts with a limited life, but I think they should last longer than 30 hours. What brand of carb kit did you use?
    "Helping you make smart choices about your money - so you can live a better life."

  3. #3
    Joined
    Jan 2002
    Posts
    586

    Default Re: This is starting **** me off

    THey were Mikuni kits. I've heard this creasing problem is unique to Yamaha
    triples and caused by using the choke to much, or liquid in the case etc.
    I've studied the Mikuni flow diagram and I can't see how the the choke could
    affect the valves. It also looks to me like the pump diaphram would take the blow from too much pressure from the case due to liquid. I was hoping John
    Kubiak, Bill Oneill, Or TS would have some insight.

    By the way did you get your pump duct repaired?

  4. #4
    Joined
    Mar 2003
    From
    SBT
    Posts
    21,545

    Default Re: This is starting **** me off

    Do a search, I posted a long thread with pictures on this a couple years ago.
    SBT Tech Support is here to help with your problems.
    We try to answer each question quickly and accurately.
    Please do not use Private Messaging for Tech Support, use the forums.

  5. #5
    Joined
    Jan 2002
    Posts
    586

    Default Re: This is starting **** me off

    I searched under every phrase I could think of and couldn't find anything.

    I seen to remember your post about it but now that I need it I can't find it :(

  6. #6
    Joined
    Aug 2001
    From
    Louisville,KY/So.IN
    Posts
    236

    Default Re: This is starting **** me off

    get rid of your cranking at startup and you get rid of 90% of creasing.

    lose the choke and put a primer kit in.
    97 venture11/1200, 01gp12r stage1, 02F12X
    dav_dman@yahoo.com

  7. #7
    Joined
    Jan 2002
    Posts
    586

    Default Re: This is starting **** me off

    Looking into ordering one today. Thanks for the advise

  8. #8
    Joined
    Jan 2002
    Posts
    586

    Default Re: This is starting **** me off

    Got the primer ordered. :emoticont Are any carb adjustments needed?. I'll be using the stock flame arrestor

  9. #9
    Joined
    Aug 2001
    From
    Las Vegas, Nevada
    Posts
    1,220

    Default Re: This is starting **** me off

    Nope.
    John Kubiak
    Powersports Technical Training Professional
    Las Vegas, Nevada
    Sea-Doo Tech 13736
    PWC Tech since 1988 (22 years)
    PowerSports since 1976 (34 years)
    NEVER BUY TIRES AT A "BLOW-OUT" SALE
    Please do not use Private Messaging, use the forums.

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