Reply To: GT250 EFI Throttle Body Synchronization
Just like the carbs , you can look at the throttle body ports , and use a “sync tool” that measures the vacuum that is being pulled by each cylinder, you want them to be almost identical to each other
As you don’t want 1 cylinder to pull more air than the other one when you open throttle , it can disregulate all the other sensors that detect air in the bike from air box down to the lambda sensor , usually there is 1 port per cylinder with a pipe going to the ISCV
So you can connect the Idle Solenoid Valve (ISCV) as normal but in the middle of each pipe , get a “t-junction” piece that will allow you to connect a third hose each cylinder , then those extended extra hoses go to your carb sync tool to see how well your throttle is in sync or not.
Also, it sounds very stupid but sometimes I used to have this issue dealing with customer bikes , after many struggles , i replaced the stator and it was working okay but the stator did not give me symptons …but sometimes it will act very strange causing the tachometer to jump around 1000 to 2000 rpm , so the ECU is not sure what to do as the flywheel timings are erratic.
Hope this gives you ideas ?