Reply To: Carb vs EFI 650 + ECU Swap
Hmmm, your 650 should have a Japan Mitsubishi ECU (if it says 2008-2010 on the chassis) , it is not a bad ECU , but any EFI will be a little slower for emission laws in certain countries, so Hyosung just used a universal map of their own , so it behaves the same way whatever country it is sold to
Have tried this first (use the service manual on the forum for tutorials),
- compression check
- valve clearances
- TPS check
- Fuel Pump can’t be checked easily but check strainer isn’t gunked up or if the motor sounds weaker, get a new pump, it helps a LOT.
- Pour injector cleaner for bikes inside your fuel tank (all of it) => Ride until the tank is low on fuel, so the cleaner mixed with fuel can try to “soft-clean” your fuel system so to speak, maybe injectors could just simply need a clean. Worst case scenario (brand NEW injectors will make the bike alive again)
Report back with your figures?
Check the last owner didn’t add performance filters or upgraded his jets or did some kind of tuning or change sprockets to alter gearing to make you feel like its faster than your EFi.
EFi is supposed to be more snappier on throttle than a carby one in general.
But ….. a properly tuned carb model will have a small edge of a stock EFi.
Unless you’re also smart or know someone that lives inside DELPHI ECU’s , you can ask them to tune your ECU if it says DELPHI with the harness etc , there is a risk, a small mistake can render the ECU dead completely.
So check your bike with the manual & do the cleaning suggestion , then see how you feel and weigh your thoughts on that.
Keep us posted!