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  1. #1

    Rebuilding GP1200 with a few mods

    Hi all...Im rebuilding my 1998 Gp1200 and looking to do a few mods and would like to ask the advise of people that have done it before.
    Im going to port the cases and mild porting of the cylinder,mill the head to 150psi,rejet cards to 135/110 115 spring and 1.5 n/s with return drilled out and 105 jet in return line.
    Doing these mods will i need to run extra fuel to the cards? I remember reading a post about a second fuel line but couldn't find it again for the life of me lol so if any help on this would be great thanks.


  2. #2
    Yamaha artisan Cutlass's Avatar
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    Dual fuel feed to the carbs is a great reliability mod. Most people do ok with a single fuel line but if you want the most reliable fuel feed to the carbs then go for the dual fuel feed.

  3. #3
    Moderator OsideBill's Avatar
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    If you are doing porting you will need more fuel to the carbs.
    Who is doing the porting?
    The jets will need to be 105 pilots and 140 mains, 2.0 N&S and Gold spring.
    Dual fuel supply to the carbs is recommended as a safety feature.

  4. #4
    Quote Originally Posted by OsideBill View Post
    If you are doing porting you will need more fuel to the carbs.
    Who is doing the porting?
    The jets will need to be 105 pilots and 140 mains, 2.0 N&S and Gold spring.
    Dual fuel supply to the carbs is recommended as a safety feature.
    Thanks for the reply

    I will be doing the porting. I have done a few superjets now and all has been good so will do my trusty GP.
    Where do you put the second fuel line?..Do i remember correctly that i just tee into the line between middel and front carb?

  5. #5
    Moderator RX951's Avatar
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  6. #6
    Quote Originally Posted by RX951 View Post

    Thanks for that very helpfull

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