Reply To: Just got my hands on “new” bike and I need help – GT250
I would stay on the carb system as the FI system on the 25o means you have a lot of EFi parts to stay on top of. Carby is better as its less maintenance and less worry, it’s just better. However, in regards to your cluster , post a picture so we see what it looks like first. If still wanting to go EFi , check the wiring tables posted by another member in this forum , including this too https://hyoriders.club/fuel_induction_manual/ Also wiring diagrams vary wildly so choose the appropriate manual (on this forum) or ManualsLIB site , Hyosung used 4 different harness on EFI models and 4 different ECU, they use different sensors , it is a big thing to match everything right or you get problems trying to run things properly. Common now is DELPHI ECU (it will say it on the ECU) and uses Delphi Harness (2013-2015) and Delphi V2 harness (different connectors and more fuses) (2016-2019) Older ECU is not possible anymore (Sentec, Daewoo, etc due those companies not existing anymore) – Hyosung is using Delphi Electronics going forward , you need a tank that accepts EFi pumps too, and possible EFi throttle bodies and a wide array of sensors, EFi air box, injectors , Exhaust should have 2 ports for lambda (Delphi later models) or 1 lambda port for older Delphi or older ECUs . Though It is hard to comment further until you provide pictures and details of what you have laying on the floor , and possible tell you what system you have. If the harness has been chopped up , it can be saved but be suspicious! There is a reason carby was better outcome for the bike probably and Regulators are common fault for ALL OEM Hyosung and Chinese Junk ones. Use a TrueMOSFET one such as SHINGDEN Japan , if not , just visit ElectroSport USA , they make an “OK-ish” regulator for the bike.
As far as I could document myself in one day, its running on the first gen of Daewoo CDI and harness.
Currently, I have put back on the bike half of the EFI harness, and also mounted the throttle bodies. I have to re-make the fuel lines and vac system since the previous owner took it all out, and i would really need some help(pictures of a standard one) to get it done.
I will try to take the CDI to my workplace, since we have some electricians that could try to fix it. If not possible, I will accept my defeat and switch it back to carburetor(and do it right this time, since it was all messed up) and hoping it would start.
Couldnt start it up anymore since i got home, but the guy I bought it from started it right up.