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  1. #1

    Yamaha gp1200 wont accelerate?

    Hey everyone,

    I've had a yamaha gp1200 for a few years now and this season it wont accelerate past 18mph. The rpms wont pass like 3k either. Engine looks good(took the head off inspected the pistons) and holds compression. I don't know much about PWC but i think its a carb issue(clogged screen?). We had similar issues in the past and had them rebuilt by a marina for a crazy price.

    I have a few questions about the shopping list I put together..

    Yamaha D Plate Cat Remove Chip Xl Gp Xlt 1200 R $69.95
    GP1200R/XLL/XLT FILTER KIT,66V $239.95
    Carburetor, 44mm Mikuni Super BN R-Type - Three $599.85
    OIL PUMP BLOCKOFF, 8/11/1200 $14.95
    FUEL FILTER, OE SPEC, 1/4"" $15.95
    Spark Plug, NGK three $14.85

    My plan is to convert into a oil mix setup, get rid of the cat, change plugs and fuel filter, add flame arrestors, and put three new carbs in.

    Are the Hi-Performance Mikuni 44mm Super BN R-Type Carburetor's ready to install? Are they complete for $199 ea?

    "R-Type" models are race equipped, choke body is removed, jetting and pop-off pressure is set for competition use."
    Does this mean I can install them as is with the mods I plan to install? Am I better off rebuilding the stock ones?

    Thanks in advance.


  2. #2
    Moderator OsideBill's Avatar
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    The carbs are not the correct ones for this ski. You are better off finding a used OEM set, that has been rejetted for the filters you want to add.
    read this regarding the carbs and upgrading to aftermarket Flame Arrestors (filters) http://www.greenhulk.net/forums/showthread.php?t=70129
    If you are interested contact me regarding the carbs I have some and would also like to know what is wrong with yours.

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