Forums 🚥 PiT STOP 🔧 Hyosung Technical Help Starting/ running issues – GT125

  • This topic has 2 replies, 3 voices, and was last updated 1 year ago by Simon.
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    • #8163
      • Topics: 7
      • Replies: 17

      I’m after some help/ advice. Bought a project 2016 GT125R in Feb. Turned out the engine was goosed ( found oil pump teeth sheered off and so was ran with no oil pump 😖) Sourced a running 2nd hand engine. Fitted engine along with upgrade fuel filter, fuel pipes, vacuum pipes and EGR blank. Turns out wiring loom was also bodged/ rotten so that was replaced along with the airbox and starter solenoid. It now starts! But will only start with choke on and with throttle twisted a bit whilst pressing start button. Smokes a bit and smells like it’s over fuelling. BUT if choke turned off it wont start or run. Does it sound like the carb needs overhauling? It also has a full black widow exhaust but not sure if been upjetted etc. Bike had been sat about 8months. If a carb overhaul and new jeta is needed what sort of price is this to have done?

    • #8164
      • Topics: 7
      • Replies: 86
      2015 GT250

      Pull the carbs, remove every jet, blow carb cleaner through all the ports. Pilot jets are probably cheesed up as they have the smallest orifices.

    • #8165
      • Topics: 1
      • Replies: 203
      Gt250 f1

      Definitely fuel problems, the carbs really need stripping & ultrasonic cleaning.

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