One of the common complaints about my FJ09 is snatchy fueling and excessive engine braking. It IS a little difficult to control the throttle smoothly, especially at low speeds. This is because, apparently for emissions reasons, when you back off the throttle the injectors cut off completely. LOT of engine braking. Opening the throttle back up without chain snatch takes some practice.
So, there's a company out in Washington that will re-flash your ECU to correct these things and will also change several other settings to your specification or a custom flash if you've gone to an aftermarket exhaust or suchlike.
They're having a sale so I'm going to have their basic stock flash done which will cure the snatchy throttle issue and also have them remove the electronic speed limiter and lower the "fan on" point to 200°. Even in Maine, the bike will go north of 220° at a stop light in July.
The ECU is under the gas tank.
Removing the gas tank on my 1979 Yamaha XS650:
Open seat
Take off one fuel line.
Remove one bolt.
Remove tank.
Removing the gas tank on my 2016 Yamaha FJ09:
Upper Tank Trim. (4 fasteners)
Upper Tank Shroud. (4 fasteners and 2 rubber bung mounts)
Rear Tank Shroud. (4 fasteners)
Lower Tank Shrouds.(3 fasteners, a bung mount and some velcro on each side)
Turn Signal Panels.(3 fasteners, an electrical connector, a bung mount and a clip on each side)
Rear tank mount bolts.(2 fasteners)
Front tank mount bolts.(2 fasteners)
Just so I can lift the tank up far enough to undo two multipin connectors and slide the ECU out. And I cheated and just propped the tank up while removing the ECU instead of unhooking yet another connector and two hoses from the fuel pump and taking the tank all the way off.
Fortunately, there was a tutorial. Sufferin' Teapot, there's a lot of plastic on that bike.
Almost makes me want to go back to carburetors. Almost...
So, there's a company out in Washington that will re-flash your ECU to correct these things and will also change several other settings to your specification or a custom flash if you've gone to an aftermarket exhaust or suchlike.
They're having a sale so I'm going to have their basic stock flash done which will cure the snatchy throttle issue and also have them remove the electronic speed limiter and lower the "fan on" point to 200°. Even in Maine, the bike will go north of 220° at a stop light in July.
The ECU is under the gas tank.
Removing the gas tank on my 1979 Yamaha XS650:
Open seat
Take off one fuel line.
Remove one bolt.
Remove tank.
Removing the gas tank on my 2016 Yamaha FJ09:
Upper Tank Trim. (4 fasteners)
Upper Tank Shroud. (4 fasteners and 2 rubber bung mounts)
Rear Tank Shroud. (4 fasteners)
Lower Tank Shrouds.(3 fasteners, a bung mount and some velcro on each side)
Turn Signal Panels.(3 fasteners, an electrical connector, a bung mount and a clip on each side)
Rear tank mount bolts.(2 fasteners)
Front tank mount bolts.(2 fasteners)
Just so I can lift the tank up far enough to undo two multipin connectors and slide the ECU out. And I cheated and just propped the tank up while removing the ECU instead of unhooking yet another connector and two hoses from the fuel pump and taking the tank all the way off.
Fortunately, there was a tutorial. Sufferin' Teapot, there's a lot of plastic on that bike.
Almost makes me want to go back to carburetors. Almost...