Reply To: Just got my hands on “new” bike and I need help – GT250
Doo a deep dive in your area to find any wrecked 250 EFi, they would be great for parts. Daewoo uses an OEM black pump that has a different pressure rating (harder to find) , Delphi pumps are OEM Blue and have OEM numbers printed on them. airbox EFi has port to slot in the ISC valve (idle speed controller) , and it sends 2 air pipes down to the throttle bodies. The pump splits 1 fuel pipe in to a T-Piece which joins 2 smaller pipes feeding either injector (front + rear )
Okay, but what about the return line? I cant figure it out. Thanks a lot!
have to see what your setup looks like, not all needed and itβs complicated to give a straight answer due to differences between the older and newer pumps and wether the past owners have made modifications to the fuel railing systems such as using a Kemso aftermarket pump or changes to the pressure relief valves on the pumps. The older black pumps had different pressure ratings and had 1 pipe ==2 pipes ==then single pipe down to the frame == then 2 final pipes to either throttle body where the injector is. Most of the time , you will see a single hose leaving the pump going to the middle section of the bike frame. It breaks off in to Front Pipe and Rear Pipe after that junction. The 250 is a little less complicated than the 650 thankfully. You will deal with more air pipes for the throttle bodies , air lines from airbox to Electric Valve Pump which sends even more air down the exhaust pipes (emissions control) (Some bikes out of UK actually have far more , like the american versions for some kind of extra emissions control) , more pipes from either engine cylinder going in to the airbox etc.
Alright, from what you said, I found out that my model doesn’t have a return line.
Yesterday I stripped the wiring loom for the injectors+throttle body sensors and found out that the some wires were broken, the wires for the injectors had the insulation melted (probably from touching the engine) and covered up + some weak connections. Soldered everything up and insulated them very well and hoping not to have to do this to the main harness, also hoping that the injector wires didn’t generate a short and fry the CDI.
Fuel lines are done, I just need to do the air lines from the air box, add a fuel filter, finish swapping the carby wiring loom with the EFi (about 50% done), check for spark, add a new battery and crank it up. Hope I can get it starting this week.