WSM Crankshaft Position Sensor 004-521 Replaces 420966570 for Sea-Doo 900 / 1000 / 1503 Jet Ski

This is a crankshaft position sensor from WSM, item 004-521, a replacement for OEM 420966570. It is listed for Sea-Doo 900, 1000 and 1503 engine PWC. The crank sensor tells the ECU engine position and speed, so it is a common part to replace when a ski cranks but won't start, stalls, or runs erratically.

Fits

• Sea-Doo jet skis with 900, 1000 and 1503 engines (confirm your model and year with us before ordering)

Replaces OEM part numbers

420966570

Not sure it fits your ski? Call or text 954-914-6465 with your hull ID (HIN) and we'll confirm before you order.