Manufacturer Part Number:
021-550
Cross-Reference OEM Part Numbers:
Kawasaki OEM: 59256-3704
Engine: 549cc 2-Cylinder 2-Stroke Reed Valve — Bore × Stroke: 72.5mm × 66.5mm — 41 HP @ 6000 RPM
Pump Thrust: 368 lbs
Jet Pump Housing: 140mm diameter — mixed-flow jet pump design
Notes:
• The Kawasaki JS 550 was the first mass-produced stand-up jet ski — launched in 1982
• All 1982-1989 JS 550 models use the same jet pump and impeller
• Early pump housings lack a stainless steel liner — consider upgrading to lined housing
• NOT compatible with JS 550 SX (1990-1995) which uses a different pump design
Specifications:
• Blades: 3
• Housing Diameter: 140mm
• Material: OEM replacement grade
• Fits: Kawasaki JS 550 1982-1989
Features:
• Direct replacement for OEM Kawasaki impeller 59256-3704
• Mixed-flow jet pump design — provides 368 lbs of thrust from the 549cc 2-stroke engine
• Restores factory performance when replacing a worn, damaged, or cavitation-pitted impeller
Installation Notes:
• Inspect pump housing liner condition — early JS 550 housings lack stainless liner
• If housing shows scoring or wear, consider upgrading to a lined housing for longer impeller life
• Check wear ring clearance before installing — excessive gap causes cavitation and reduced thrust
• Apply marine-grade anti-seize to impeller shaft before installation
PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.
WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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