Kawasaki JS550 Repair

First introduced in 1982, the Kawasaki JS550 is an iconic stand-up personal watercraft (PWC) that played a pivotal role in popularizing Jet Ski culture throughout the 1980s and 1990s ¹. It succeeded the earlier JS400 and JS440 models, offering riders a significant leap in power and performance ¹.

The JS550 was a landmark release for Kawasaki as it was the first Jet Ski to feature a newly designed, high-capacity mixed-flow jet pump ¹. It also introduced advanced-for-its-time technology like an automatic RPM limiter to prevent the engine from over-revving when the pump sucked in air or left the water ¹. Because of its lightweight hull, nimble handling, and highly modifiable engine, the JS550 remains a highly sought-after vintage watercraft among stand-up PWC enthusiasts ².

The Kawasaki JS550 can be identified by the following characteristics:

• Decals & Branding: Look for "Jet Ski 550" or "JS550" decals on the side of the engine hood and hull.
• Hull Shape: Features a narrow, classic stand-up hull design constructed of hand-laid fiberglass (earlier models) or Sheet Molded Compound (SMC) (later models) ³.
• Engine Type: Under the hood, it features a water-cooled, 531cc twin-cylinder, two-stroke engine ¹.
• Hull Identification Number (HIN): Located on the right-rear (starboard stern) of the hull, the HIN can be used to decode the exact model year.

• Engine Type: Water-cooled, 2-stroke, inline twin-cylinder ¹
• Displacement: 531 cc (531 cm3cm3) ¹
• Horsepower: ~36 hp to 41 hp (varying by production year/tuning) ^{3 4}
• Pump: High-capacity mixed-flow jet pump with aluminum housing ¹
• Fuel Capacity: ~4.5 gallons (17 liters)
• Dry Weight: ~250–265 lbs (varying slightly by hull material and model year) ³
• Fuel Type: Gasoline (requires gas/oil pre-mix)