Reply To: Umbau von Gt125r motor auf GT250 Motor

[♠️ M77]

Use 250 jets pilots and mains, because of bigger pistons, or it will be lean and burn a hole in the piston.

Don’t worry about the vacuum pump, all 125 / 250 are using 650cc pump – Hyosung uses a 650cc pump on their 125/250 motors. So if a GV650 can use the vacuum pump, your 250 will never max it out.

Good luck!