Forums 🚦#HYOCULTURE ☕️ New Member Intros Hello, I have a new project.

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    • #4254
      Ricky Groves
      Member
      • Topics: 3
      • Replies: 5
      Joined:
      Apr 10, 2020
      @rickg
      UK South
      RT125 2009

      Hello all.

      I have recently joined because my lad has bought a pile of scrap new project.

      He can now ride a 125cc, stepping up from his 50cc. He bought a Hyosung RT125 from a friend who said it had an electrical issue with the back lights and the exhaust kept coming loose.

      Once at home in the garage it became clear that in it’s 10 years it has been very abused. I think the previous owner probably only had two tools in his tool box, a x-point screwdriver and a hammer.

       

      The list of faults is very long but we have been working through them in a hope to return it to the road. It has not been to the MOT station for 3 years.

       

      The exhaust issue was interesting. The rear silencer had been rubbing on the tyre because only one bolt was holding it on at the back. Turns out it is not the silencer for this bike, only the rear mount touches the frame, the forward mount touches the inside of the rear mudguard.

      The header pipe couldn’t be tightened to the head because someone has stripped the stud threads out of the head and tried gluing them back in with silicon and/or Metalset or Polyfilla or GunGum or some other unsuitable product.

      The header pipe didn’t meet the silencer at the correct place and had been resting on the plastic engine casings on the left side, melting them slightly. This is because it is from an RX125, not RT125. It had also had some metal let into it just ahead of the flange to allow it to clear the frame.

       

      There are many other problems, but we will probably give this bike a name and run a project thread as it gets rebuilt and ready for the road.

      We have noticed that there aren’t many of these around and it looks like spares supply is sketchy and pricey.

      Did Hyosung engineer this bike or did they “borrow” parts from other bikes in their range or from other manufacturers (Suzuki for instance)? Can I source a part used on a different bike?

    • #4255
      ♠️ MARCEL
      Administrator
      • Topics: 38
      • Replies: 429
      Joined:
      Apr 10, 2020
      @mf448kxn6
      North UK
      GTR

      Hey welcome!

      Sounds like the bike has been through hell and back that’s for sure!  My goodness.

      Good on you for trying to resurrect it back to its original state, though i understand there will be some days of cursing!  (tip the swear jar later!)

      To answer you , yes there is some few things that were shared with some other hyosungs but not much.  We don’t know the year of your bike because some single piston hyosungs either had the legacy single camshaft engine and the later models had the dual camshaft heads , sometimes even the electronics vary slightly . Having specifics of your bike would be ideal, you can always attach an image in this topic of how the engine looks etc,

      There is a 2MB limit per image size but a site called picresize can scale down any big images down to forum sized 2MB ones ,  or  use imgur . com website (no size limit) => copy the “FORUM BBCODE” share links, and paste them here , the site will pull the images remotely even.

      Also what kind of parts where you planning to change? you are correct to say there isn’t many on the UK roads at present but much more worldwide , ie the EU where some countries still have 125s .  Parts etc depend on what it is what. If i can’t get a part from the trade myself , i can always point to your nearest dealer (incase they break old ones) or another one closer to me.

      If i’ve learned anything while fixing and stripping hyosungs, some things were done inhouse that couldn’t be found on other brands that’s for sure.

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

    • #4258
      Ricky Groves
      Member
      • Topics: 3
      • Replies: 5
      Joined:
      Apr 10, 2020
      @rickg
      UK South
      RT125 2009

      Thanks for the welcome Marcel.

      The bike is 2009, it has a DOHC 4 valve head engine fitted, the number matches the V5 so I presume it is the correct and original engine.

      I know other engines will fit but given it’s condition I don’t think the V5 would have been updated if a transplant had been done.

       

      I’ll start a new thread later with pictures and details of what we have.

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