OS 1.50 Piston Kit for Kawasaki KLF 300 Bayou, KEF 300 Lakota, and KVF 300 Prairie ATVs is engineered to restore compression and reclaim lost power across the 290cc powerplants in the KLF/KEF/KVF family. The oversize 1.50 mm bore yields a 77.50 mm diameter, delivering a true 290cc displacement for crisper throttle response and improved high‑end performance while maintaining a reliable seal. This kit is designed to meet or exceed Kawasaki engine standards, providing a durable, long‑lasting rebuild option for trail and farm duty. OEM reference part number 13001-1430 ensures precise cross‑compatibility across the KLF/KEF/KVF 300 family.

Beyond merely replacing worn parts, this OS 1.50 piston kit offers a tangible performance improvement for riders facing compression loss, low-end stumble, or reduced top speed from an aging top end. The increased displacement helps restore peak power without resorting to a complete engine rebuild, giving you reliable, repeatable performance in demanding conditions like mud, sand, or steep climbs. As an aftermarket replacement designed to fit the Kawasaki 300 line, it provides a cost‑effective path to restore trail‑ready power and durability.

Comprehensive Vehicle Fitment

Fitment data drawn from model ranges across the Kawasaki 300 family.

Product Specifications

Specification notes reflect oversize 1.50 mm bore, 77.50 mm size, and 290 cc displacement with an ~8.6:1 compression ratio common to this family, based on official oversize piston data for the Kawasaki 300 lineup.

OEM & Aftermarket Cross-Reference Information

Cross-reference data anchors to the OEM Kawasaki reference 13001-1430 and identify the compatible aftermarket replacement for the 1.50 mm oversize kit.

What's Included

This piston kit includes the essential components to complete a top‑end rebuild for the Kawasaki 300 family. The box contents typically include:

• Piston
• Rings (set)
• Piston Pin (wrist pin)
• Circlips

Notes: Gasket kit and other top-end components are not included in this kit; verify what you already have or plan to purchase separately.

Contents and packaging reflect typical aftermarket piston kit configurations (rings, wrist pin, and circlips are standard inclusions in most aftermarket piston kits).

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Specifically engineered for Kawasaki KLF 300, KEF 300, and KVF 300 engines with an OS 1.50 bore, ensuring straightforward installation and reliable seal.
• OEM Cross-Reference: Uses the Kawasaki OEM reference framework (13001-1430) to simplify sourcing and compatibility checks.
• Premium Materials: Aluminum forged piston with robust skirt design for high‑heat, high‑RPM endurance typical of ATV use.
• Precision Engineering: 77.50 mm bore and 64.00 mm stroke engineered to restore correct compression and to maintain proper piston ring seating.
• Performance Restoration: 290cc displacement recovers lost midrange and top‑end power, improving throttle response on trails and fields.
• Value‑Oriented Upgrade: A cost‑effective route to top‑end reliability without a full engine rebuild.

Notes: All performance claims are based on the oversize 1.50 mm kit specifications for the Kawasaki 300 family and typical top‑end rebuild expectations for 290cc engines.

Installation Notes:

• Inspect the cylinder bore for wear or glazing; a worn bore can negate the benefits of an oversize piston if not addressed.
• Orient and install piston rings with correct top/second ring orientation (check markings if provided); ensure end gaps are within spec for the bore size.
• Apply a light coat of assembly lubricant to the piston skirts and rings before installation to prevent dry startup.
• Install the wrist pin and circlips securely; verify the circlip seats fully in the groove to prevent loss during operation.
• Verify piston orientation relative to the connecting rod so the crown faces the combustion chamber; incorrect orientation can cause early wear or failure.
• During break‑in, run at light throttle for the first 20–30 minutes to seat rings, then gradually introduce higher loads; monitor for unusual noises or loss of compression.

Notes: Some tips reference standard piston kit practices; refer to your service manual for Kawasaki 300 series specifics and torque/clearance guidelines where applicable.

Why Upgrade?

Running a worn piston in a 290cc ATV engine can lead to degraded compression, reduced throttle response, and diminished high‑end power, especially under load on trails or farm work. This OS 1.50 piston kit restores compression and displacement, delivering dependable power and longer‑term reliability by rejuvenating the top end and improving sealing for sustained performance.