Idle gear for the water pump for Rotax Evo engines. Plastic gear with 28 teeth on outer ring, 13 on inner ring. This gear is an essential component of the Rotax engine, as it powers the water pump to propel the cooling system circulation in the engine.
This gear sits on the water pump impeller unit, and is powered by crankcase gears in the Rotax FR125. Due to their plastic construction, these gears can wear out, especially in extreme weather conditions such as extreme cold.
Each water pump idle gear is sold separately, as pictured.
Part Number 634035.