CDI YAMAHA 6H0-85540-07-00

Function and technical context

The CDI (Capacitor Discharge Ignition) unit is the essential component of the ignition system in Yamaha two-stroke marine engines. This device manages the generation and distribution of the spark on the spark plugs through an electronically controlled capacitive discharge circuit, guaranteeing precise ignition and synchronized with the engine cycle. CDI reliability is critical to maintaining engine power, optimal fuel consumption and safe starting in any boating conditions. A failure in this unit causes a total loss of ignition, making it impossible for the engine to operate.

When to replace this part?

Symptoms of CDI failure include intermittent misfires, difficulty starting even with a good battery, sudden loss of power while cruising, or complete engine stoppage without signs of fuel supply problems. Although the CDI does not have a fixed preventative maintenance interval like other components, it is advisable to check its operation during each seasonal inspection, especially after prolonged periods of storage or exposure to moisture. Early replacement of a faulty CDI unit avoids running out of propulsion in the water and prevents secondary damage to the engine's electrical system.

Equivalent manufacturer part numbers