Buyer Research

2021 Kawasaki Ultra 310R — Should You Buy One?

Typical asking price: $14,000–$18,500. There are 2 high-severity known issues you need to know before handing over a check.

Kestrel Take

A supercharged big-water beast — the Ultra 310R makes 310 hp and rides the biggest, most stable hull in the class, making it a favorite for rough-water and offshore riding. The supercharged four is strong; verify its service (Kawasaki superchargers are more robust than some but still need attention) and the pump. A low-hour, freshwater (or well-flushed) 310R with clean compression is a hugely capable performance ski.

Known Issues for the 2021 Kawasaki Ultra 310R

Ranked by wallet impact. These are documented, recurring problems — not freak accidents.

Supercharger / engine serviceHigh — wallet impact

Verify the supercharger and engine service history and compression; the 310 makes big power and hard use takes a toll.

Repair cost range: $300-$3,000+

Engine hours / hard useHigh — wallet impact

Big supercharged skis get ridden hard; verify hours and service.

Repair cost range: $300-$5,000

Wear ring / pump conditionMedium

High power stresses the pump; inspect the wear ring and impeller.

Repair cost range: $150-$700

Salt corrosion / flushingMedium

Verify flushing and inspect for corrosion — many Ultras are ridden offshore in salt.

Repair cost range: Varies

Walk-Away Red Flags

✗No supercharger/engine service record
✗High hours, hard use
✗Salt without flushing
✗Poor compression

Good Signs

✓Documented supercharger/engine service
✓Reasonable hours, clean compression
✓Flushed/freshwater, healthy pump

Found a specific Kawasaki Ultra 310R?

This page covers what goes wrong on the 2021 Kawasaki Ultra 310R in general. The Kestrel report covers this specific car— the asking price vs. market, the photos, the seller's description, and a BUY / NEGOTIATE / WALK AWAY verdict with a negotiation script.

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Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.