GT90 Carburetor Help

Discussion in 'Performance Mods' started by Phabbits, Aug 7, 2017.

  1. Phabbits

    Phabbits New Member

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    Hello All!
    I am fairly new to the gas motorized bike scene, and I was wondering if anyone could help me identify the extra line coming out of my carburetor. I purchased the carburetor as a part of the GT90 conversion kit from gasbike.net, and they did not have any instructions that they could provide. I believe that the lowest line going out is for draining the carb, and the middle one is for overflow, but any affirmation or correction would be appreciated. Thanks! FullSizeRender.jpg IMG_0628.jpg
     

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  2. Frankenstein

    Frankenstein Well-Known Member

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    It's hilarious how each one of these say standard of Japan. Different brands and design haha! 2017-08-07 20.13.03.jpg

    You are correct in your assumptions with the 2 lines, the remaining nipple is the fuel connection.
     
  3. Phabbits

    Phabbits New Member

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    Awesome, thanks for helping me. There is very little information of this that I could find on the Internet.
     
  4. Phabbits

    Phabbits New Member

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    Sorry to bring back an old thread, but I have a few more questions. I recently completed the build, but know the engine will not start. The drainage hole is constantly leaking fuel, but I do not know how to stop it. I was wondering if anyone could tell me what the brass and silver screw was for. I believe that the silver one sets the idling speed, but I am not sure. Any help would be greatly appreciated.
     
  5. Street Ryderz

    Street Ryderz Well-Known Member

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    The brass one is the air screw to set idle mixture,The silver one is the idle adjust to set the slide height!
     
  6. Phabbits

    Phabbits New Member

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    Thanks, sorry for the stupid question. I now completely reassembled the kit, only problem is it won't start. It fires one time, then smoke comes out of the engine. I believe that it is that the studs holding down the cylinder are to long, but I am not sure. I'll give you all an update when I figure it out.
     
  7. keagan

    keagan New Member

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    Hey Phabbits! could you give me a little help? I am building the GT90 my self and I'm wanted to know anything that could help with this build (like carb setups what kind of fuel to run in it things to replace before building!)

    Thanks Keagan
     
  8. Phabbits

    Phabbits New Member

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    Hey Keagan!
    So sorry it took me so long to reply. I had just left for college, and did not think of checking my thread. I would be glad to help you anyway I can, although I am fairly new to the motorized bike scene myself. One thing I noticed right away about the build though, is that there are three different style crank rods for these kind of motors, and unfortunately the engine I was originally trying to upgrade had a different style crank than the GT90 kit, so I had to get a different engine to upgrade. I am still trying to figure out the carb setup myself, so I am not sure how much help I will be there, and I am not sure what fuel mixture I am going to run in it, but I am thinking 16:1 for the break in. If your are trying to install this with the sickbikeparts shifter kit, please be aware that the casing is different, and will require an amount of filing, and sawing. Once again I am sorry that I have not checked the thread till now, but for now on I will try to keep up with it. Hope that helped, and I was not too late!
    Regards,
    Gabe
     
  9. Phabbits

    Phabbits New Member

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    I have another thread that you may find helpful where I am trying to figure out why the motor won't start, it's titled GT90 Conversion Kit Won't Start
     
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