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Help GSXR250 GJ72A - Power problem

Discussion in 'Suzuki 250cc In-line 4's' started by Luejay Orboc, Nov 20, 2024.

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  1. Luejay Orboc

    Luejay Orboc Ljay Premium Member

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    My Bike:
    80s Suzuki GSX-R250 GJ72A
    So what I am experiencing about lacks of power is probably caused by that?
     
    Luejay Orboc, Nov 26, 2024
    #21
  2. Linkin

    Linkin The Mechanic - Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Very likely. It is a huge air leak, and sucking unfiltered air. It will make that cylinder incredibly lean as far as the fuel mixture is concerned.

    I bet if you look at the spark plug, it will be white and clean with zero carbon. Should be a nice tan colour.

    Give me a few minutes and I will get you the links for replacement parts (if available)
     
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    Linkin, Nov 26, 2024
    #22
  3. Linkin

    Linkin The Mechanic - Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    My Bike:
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    13110-05C01 x2 - Left hand, Middle right
    13120-05C01 x2 - Middle left, Right hand

    However those part numbers are discontinued

    Replacement part numbers, you need two of each

    13101-05C01-000 PIPE,INTAKE 1-3, Suzuki
    13102-05C01-000 PIPE,INTAKE 2-4, Suzuki

    Clamps - dependant on type? Check against your frame number

    09402-38303 x4 Type H/J
    09402-38306 x4 Tyke K

    Available on Megazip and Impex, but cheaper on Megazip.

    https://www.megazip.net/zapchasti-dlya/suzuki/pipe-intake-2-4-1310205C01000

    https://www.megazip.net/zapchasti-dlya/suzuki/pipe-intake-1-3-1310105C01000

    Type H/J: https://www.megazip.net/zapchasti-dlya/suzuki/clamp-0940238303000

    Type K: https://www.megazip.net/zapchasti-dlya/suzuki/clamp-0940238303000


    May be worth asking your local Suzuki dealer and see if they can get all the bits you need.
     
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    Linkin, Nov 26, 2024
    #23
  4. Luejay Orboc

    Luejay Orboc Ljay Premium Member

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    Very much thank you mate!

    Though I still have other problem of the bike to ask soon.
     
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    Last edited by a moderator: Nov 26, 2024
    Luejay Orboc, Nov 26, 2024
    #24
  5. Luejay Orboc

    Luejay Orboc Ljay Premium Member

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    I think that my carb is having a hard time to vacuum a fuel.
     
    Luejay Orboc, Nov 27, 2024
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  6. Luejay Orboc

    Luejay Orboc Ljay Premium Member

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    My Bike:
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    So my bike, as of the time this thread was made, is running but the carburetor is not sync. So I watched on YouTube on how to manual tune parallel twin carbs and applied it. Then, I install it back and now the bike won't start. Already did adjusting the idle screw and mixture but nothing helps.

    Any idea?
     
    Luejay Orboc, Nov 27, 2024
    #26
  7. Linkin

    Linkin The Mechanic - Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    It is pointless to make adjustments with a badly split inlet manifold rubber like that. It will never run correctly.
     
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    Linkin, Nov 27, 2024
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  8. Luejay Orboc

    Luejay Orboc Ljay Premium Member

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    I understand. But the bike is in need. I applied gasket maker anyway as a temporary fix till I found a replacement for the intake.

    Just the bike itself. Seems that it is better to not than to sync it cause it did run when it was not synced.

    Confused of what took it to that situation.
     
    Luejay Orboc, Nov 27, 2024
    #28
  9. Luejay Orboc

    Luejay Orboc Ljay Premium Member

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    New problem guys, I think the bike is not charging its battery.

    I already did run the bike and got to 5th gear. Just as I came home, the bike's died and I tried to start it again, it did but barely. The battery turned weak.
     
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    Luejay Orboc, Nov 30, 2024
    #29
  10. Luejay Orboc

    Luejay Orboc Ljay Premium Member

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    Now, I noticed that if I slight aggressively run the bike (e.g taking high rpms before changing to 2nd gear), then I will attempt to stop, it dies instead then starting it again seems to be the battery has been already drained. Then I need to bump start it.

    Also noticed that the bike gets hotter every time this situation happens.
     
    Luejay Orboc, Dec 9, 2024 at 10:22 PM
    #30
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