This topic contains 3 replies, has 2 voices, and was last updated by  ♠️ MARCEL 9 months ago.

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  • #1862

    ♠️ MARCEL
    Administrator
    • Topics: 32
    • Replies: 171
    Joined:
    Nov 7, 2018
    @mf448kxn6
    Location:
    North UK
    Riding:
    GTR
    Points: 2,272

    Hey welcome!

    Sorry I didn’t reply sooner, I have just read this so , my best replies are already found in these below
    (GV125 / GT125 / GT125R = are the same engine anyway)

    #1. topic link 1

    #2. Topic link 2

    #3. topic link 3

    If the infomation on the links above did not help, let us know exactly what steps were taken & if the bike made any improvements at all?

    I hope this is just a quick fix for you.

    // Meditation doesn't mean you have to sit still....

  • #1864

    Ryan onions
    Member
    • Topics: 1
    • Replies: 2
    Joined:
    Nov 7, 2018
    @chunkymunky1989
    Location:
    West Midlands
    Riding:
    Gt125r
    Points: 54

    Thanks Marcel I apreciate the advice il try these steps will the upjet to a 90 jet make much difference and to be honest I don’t think the fuel lines have ever been changed upon inspection they look really aged as my gtr is a 09 plate but I plan to try these steps u advised as I herd ur a hyosung guru  but any further tips would be much appreciated

    Cheers Marcel all the best

    Ryan

  • #1865

    ♠️ MARCEL
    Administrator
    • Topics: 32
    • Replies: 171
    Joined:
    Nov 7, 2018
    @mf448kxn6
    Location:
    North UK
    Riding:
    GTR
    Points: 2,272

    * Any * pipe on bike = must be replaced within 2-4yrs max.
    Rubber rots inside too. And gums up parts. Stock lines have tiny holes (slower flow)

    Braided fuel and air lines last 10 years , and they run colder (meaning heat resistant) so your fuel doesnt turn gassy on a hot day.

    Big holes flow more air and fuel.     So your carbs get fuel quicker ,    big  vacuum lines help your pump flow fuel better (it works like a pulse)

    So more air in the vacuum system helps.

    Giant filters (a good one!) Hold more clean fuel as a mini reserve plus your carb has less dirt going to it.   Cant trust every Petrol station out there.

    So  yes air and fuel lines help.   Any extra info is at /shop/ page  or    search  *fuel* in the search bar ^ for a diagram .  Pictures will reveal the differences.

    Next up.  Stock jets are crap. I’ll leave it at that lol.
    Bigger jets = slight torque boost, rear engine is COLDER since petrolium has cooling effect.

    To understand or how to swap carb jetting  Search *Carb* ^

    There is a lot that can be done on these machines,  but one warning.  They hate *china* copy parts!  Eg. Cheap £1 lines. 😉

    For anything else (tune wise), copy this link  or tap below
    https://m.facebook.com/groups/345623961212?view=permalink&id=10154079865506213

    It saves me rewritting as i get asked often but  i am amending the list above as i have done a lot more since then.

    Will be finding time to make a proper  101 Book for all things  GT125R  tuning  with probably 3 pages but should be enough to allow people to do things without paying mechanics robbery prices.

    Also i have uploaded as many service manuals in forum as (125/250 = same frame)  so books also contain a lot of maintenance info etc…

    Ofcourse,   if  try everything I said in the previous replies , your bike WILL run better!

    // Meditation doesn't mean you have to sit still....

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