Fuel injection issue:
- A problem with the fuel injection system, such as a clogged fuel injector or a faulty fuel pump, can cause the engine to stall when you change down gears.
- This is because the engine is not getting the proper amount of fuel when you decelerate, causing it to stall.
Idle air control valve issue:
- The idle air control valve (IACV) regulates the amount of air that bypasses the throttle plate when the engine is idling.
- A faulty IACV can cause the engine to stall when you change down gears because it is not allowing enough air to enter the engine, causing it to stall.
Throttle position sensor issue:
- The throttle position sensor (TPS) tells the engine control unit (ECU) how far the throttle is open.
- A faulty TPS can cause the engine to stall when you change down gears because the ECU is not getting the correct information about the throttle position, causing it to stall.
Clutch issue:
- A slipping clutch can also cause the engine to stall when you change down gears because the clutch is not fully engaging, causing the engine to stall.
These are just a few of the possible causes of why your Kawasaki ZX12r might be stalling when changing down gears. If you are experiencing this issue, it is important to have it diagnosed by a qualified mechanic to determine the exact cause and have it repaired.
