YAMAHA GRIZZLY 700 Stalling At Idle

Throttle Position Sensor (TPS)

The TPS uses a potentiometer to signal throttle plate angle to the ECU; over time, the resistive element at the idle contact point wears down, creating signal 'noise' or dropouts. When the ECU receives an erratic signal at idle, it fails to calculate the correct injector pulse width for the current air intake, leading to an immediate lean stall. Replacing the sensor restores a linear voltage-to-angle relationship necessary for stable fuel delivery.

Reverse Switch Assembly

This switch is a plunger-style contact that grounds the ignition circuit to activate a rev-limiter when the transmission is in reverse. Internal spring fatigue or contamination allows the switch to intermittently contact the ground terminal due to engine vibrations at idle, causing the CDI to truncate the ignition spark even in neutral or forward gears.

SKU: 3GB-82540-01-00

NGK Iridium Spark Plug

The Grizzly 700 engine runs a high-compression single-cylinder configuration that is highly sensitive to plug fouling from the factory's lean-burn mapping. An Iridium plug provides a more concentrated spark kernel with lower voltage requirements, which helps prevent flame-out during the weak combustion cycles typical of a lean-stalling idle condition.