- See what YBR 125 are for sale on Ebay UK here
- Buy YBR 125 Parts Here on Ebay UK or Here on Amazon UK
Yamaha YBR 125 workshop manual
by the way i just bought the Yamaha FI diagnostics machine , probably not necessary , but who cares it looks interesting to me , i know nothing about it tbh what its capable of or how to use it so should be fun to learn .
The Yamaha YBR 125 has a built in engine managment system , where a series of flashes on the clocks , engine management light gives out a fault code , find out more here .
Yamaha YBR 125 Fuel Injection System Components
the main components are shown below , ecu , fuel pump (£270) and fuel pipe ( £98) and the fuel injector / throttle position sensor assembly all photoed below .
there are other components obviously like crank position sensor and flywheel ,idle control , wiring loom differences etc etc .
a lot of people ask me if a Yamaha YBR 125 carb engine will fit into an injection model frame but it will not
not unless you change the flywheel-stator at least , it might then be possible but im not sure yet , i will eventually try but have not had time to attempt yet , may be other differences as well .
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| yamaha ybr 125 fuel pump injector pump and level sender unit buy fuel pumps from ebay uk here or Amazon uk here ( be quick they go fast )  or cheaper still the internal pump unit only |
tool i made for 2 stroke injection engine bikes i used to work on , ill add a photo later , its basically just a pressure gauge fitted on a T and in the middle of a spare fuel hose i had ( these fuel pipes cost £90ea from yamaha so your brave to cut them up lol . ) , anyway fuel pressure should be 35 psi at idle .
you should hear the fuel pump prime the circuit on initial turn of the key ,
running the fuel pump - tank out of fuel can cause damage to the pump .
and testing the resistance values of the fuel level sensor is easy also see below link for expected values
at the empty and full positions .
you should hear the fuel pump prime the circuit on initial turn of the key ,
running the fuel pump - tank out of fuel can cause damage to the pump .
and testing the resistance values of the fuel level sensor is easy also see below link for expected values
at the empty and full positions .
You can see all the electrical test procedures for the fuel pump and the fuel level sender unit here . =================================================================
ECU , cannot really be tested unless fitted to a known working bike or swapping it out with a know functioning ECU.
The ECU is located on the frame underneath the tank and is easily removed and refitted to bike .
18 pin fuel injection ecu
Brown - 12Volts
Black/White - 12 VoltsBlack - Ground
Red - Magneto Sensor
Blue - Throttle Body Sensor
Pink/White - Throttle Body Sensor
Black/Blue - Throttle Body Sensor
Brown/White - Throttle Body Sensor
Yellow/Blue - Throttle opening (Variable)
Green/Red - Engine Temperature Sensor
Yellow/Green - Lean Angle Sensor
Orange - Ignition Coil
Yellow/Red - Fast Idle Solenoid
Orange/Black - Fuel Injector
Yellow - Fuel Pump
Blue/Yellow - Rev Counter Pulse
Light Green - Engine Diagnostic Indicator (Amber Light on Instrument Panel)
White/Black - Head Light
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fuel injector , inlet air pressure sensor and throttle position sensor all can be tested via the
Yamaha Fi diagnostics .
check out the posts on how to test these parts below
Temperature sensors
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Yamaha YBR 125 EFI electronic fuel injection videos , excellent information .
see more Yamaha YBR 125 blog posts
thanks for reading the Yamaha Owners blog , if you would like to support us you can by buying your newYamaha YBR 125 off ebay uk here or buying parts for your yamaha YBR 125 from ebay uk
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