Forums 🚥 PiT STOP 🔧 Hyosung Technical Help GT125 2003 Performance Issues Reply To: GT125 2003 Performance Issues
Hello, I now know what the issue is: the rear manifold has delaminated from the metal base plate and was moving when the engine was revved. I have separated it from the plate and hope that I can rejoin them. I also need to place an order for the screws that hold the needle jet base in place as one sheared in half tonight.
It sucks when that happens, don’t forget to make sure the “orings” are in good spec otherwise we generally replace them anytime the manifolds are off.
Please save that manifold, if there is a hyosung part that is in major scarcity , it would be those rubber inlets and korea stopped making them a long time ago. You don’t want to spend 3 figures asking MotoGB/Sinnis to give you one (real Hyo UK) (not the fake spares uk one , they don’t have it.)
I won’t digress as i will assume you know what you’re doing and have seen loads of youtube videos on restoring classic bike intake inlets or cars that used to run carbs in the ancient days.
Oh yeah, i have manifolds also with base plates disintergrated, blame korea for the poor sealing, i just didnt get time to fix them up yet before i flog em away. I may just keep them as salvage for when my cnc guy eventually makes me half-rubber/half-metal ones , since he already does cnc stuff for hyos on my repquires (ie. rearsets, clip on bars etc, making cables of any on demand)
// Meditation doesn't mean you have to sit still....