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  1. #1
    PWCToday Regular oddballs41's Avatar
    Join Date
    Dec 2011
    Location
    New Mexico
    Age
    37
    Posts
    103

    Blown up water box....twice.

    I posted about a limp mode issue thinking it was electrical. I am having a fuel problem. It is very intermittent. Smooth or rough water. Cold or warm. It doesn't matter. Two weeks ago I was trying to figure it out. I cranked it for about 5 seconds. I closed the hood and put up the tools. Tried one more time and it blew up the waterbox. Finished the weekend on the X2 and went home. It started right up later that week.

    Found another waterbox and put it in. Started and ran fine. Rode for about a hour, then it started again. Loaded up. Started tryin to figure it again. Started at the tank. The pick up is fine. All the fuel lines are clear. The filter is clear. I took apart the carb. Everything looked fine in it. There was a little bit of fiber looking debris in the carb filter. Put it back together and it cranked and fired briefly. Cranked about 4-5 seconds and it blew up another waterbox.

    1995 Yamaha WaveBlaster
    Pro-Tec pipe
    Blosion f/a
    Blosion head with 37 domes
    Watcon rear exhaust
    135 main
    Unknown pilot

    I remember reading somewhere that some people would put a jet in the fuel return to maintain carb pressure. Maybe that's what's needed?

    Any help or advice would be appreciated.
    1992 X2 - 42.8 mph on gps at 4100' elevation
    1992 X2 - 750 build
    1994 XIR - 1100 triple build
    1995 WaveBlaster - 47 mph on gps at 4100' elevation
    1994 WaveBlaster - ???
    1997 GP 1200 - blown up
    2000 SuperJet - stock
    1998 XL 1200 with a Shuttle Craft

  2. #2
    I dream skis JC-SuperJet's Avatar
    Join Date
    Jul 2013
    Location
    Cypress, TX
    Posts
    644

    Re: Blown up water box....twice.

    Somehow the crankcase is loading up with fuel either due to incorrect jetting, incorrect carb screw adjustment, leaking Needle Valves or maybe worn/creased carb check valves.

    But make sure the fuel tank check valve is working and the arrow points toward the tank. If it's in backward, the increasing tank vapor pressure will force fuel thru the carbs (when engine is not running) and flood the crankcase. Fuel will even backflow thru the fuel Return line. Molotov ****tail...

    By the way, the OEM Blaster fiberglass water boxes always blow-up. A matter of when, not if.
    Last edited by JC-SuperJet; 07-03-2017 at 10:18 PM.

  3. #3
    PWCToday Regular oddballs41's Avatar
    Join Date
    Dec 2011
    Location
    New Mexico
    Age
    37
    Posts
    103

    Re: Blown up water box....twice.

    I will be ordering a rebuild kit asap. I did check the check valve and it was flowing the right way. I'm also going to contact Pro-Tec and see what they recommend for this elevation. Maybe I'll do reeds as well. I started searching and reading about the stock ones blowing up this afternoon. Time to look for a aftermarket one. I'll check the screw adjustments in the am.
    Last edited by oddballs41; 07-03-2017 at 11:11 PM.
    1992 X2 - 42.8 mph on gps at 4100' elevation
    1992 X2 - 750 build
    1994 XIR - 1100 triple build
    1995 WaveBlaster - 47 mph on gps at 4100' elevation
    1994 WaveBlaster - ???
    1997 GP 1200 - blown up
    2000 SuperJet - stock
    1998 XL 1200 with a Shuttle Craft

  4. #4
    PWCToday Regular oddballs41's Avatar
    Join Date
    Dec 2011
    Location
    New Mexico
    Age
    37
    Posts
    103

    Re: Blown up water box....twice.

    Reeds are fine. Called Pro-Tec and put in what they recommend. The low was two out and high was three and a half out. Corrected that. Carb rebuilt. New needle and seat. Stock waterbox reglassed for now.
    Last edited by oddballs41; 07-22-2017 at 12:53 AM.
    1992 X2 - 42.8 mph on gps at 4100' elevation
    1992 X2 - 750 build
    1994 XIR - 1100 triple build
    1995 WaveBlaster - 47 mph on gps at 4100' elevation
    1994 WaveBlaster - ???
    1997 GP 1200 - blown up
    2000 SuperJet - stock
    1998 XL 1200 with a Shuttle Craft

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