Vertex Replica Top End Piston Kit 23637B — Kawasaki KX85 / Big Wheel 2001-2024

Vertex Replica Top End Piston Kit 23637B — Kawasaki KX85 / Big Wheel 2001-2024

Product Description

Get your mini-racer back to the front of the pack with the Vertex Replica Piston Kit. Explicitly engineered as a premium direct-fit OE replacement, this top-end rebuild setup restores lost factory compression and crisp throttle response. When a small-bore race bike starts logging high track hours, upgrading to a specialized Vertex 2-stroke piston ensures reliable power delivery, crisp acceleration, and maximum mechanical longevity.

Proudly manufactured in Italy, Vertex uses a gravity-cast aluminum alloy enriched with 18% silicone to tightly regulate thermal expansion and reduce ring land wear. The entire piston structure undergoes a precise T-5 hardening and tempering heat treatment cycle to boost structural strength, while a high-tech molybdenum disulphite coating is applied to the skirt to lower operational friction and facilitate a flawless break-in process. This kit keeps your rotating assembly operating smoothly under severe racing loads.

Top Features: Vertex Replica Piston Kit

• 18% Silicon Aluminum Alloy: Advanced cast construction minimizes dimensional shifting under high exhaust port heat for stable piston-to-wall clearances.
• Molybdenum Disulphite Skirt Coating: Lubricious barrier protects the critical cylinder cross-hatch pattern and accelerates initial break-in seating.
• Full T-5 Thermal Treatment: Hardening and tempering cycles maximize the alloy's structural integrity to withstand aggressive, high-rpm track conditions.
• Comprehensive Rebuild Components: Bundled complete with a precision-ground wrist pin, high-tensile wire circlips, and factory-matched piston rings for a secure refresh.

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Sub-Model
2001-2024	Kawasaki	KX85
2001-2018	Kawasaki	KX85 Big Wheel (BW)

Frequently Asked Questions

Q: Why should I choose the "B" size over an "A" size piston?
A: Small-bore cylinders naturally experience microscopic cylinder wear after a few top-end cycles. The "B" size piston features a fractional increment change (48.45 mm) over the baseline "A" size to take up that minute clearance gap, cleanly sealing compression back to original specifications.

Q: Are the wrist pin and small-end bearing included in this box?
A: The kit includes the wrist pin, piston rings, and circlips. The small-end needle bearing is a separate replacement item and should always be replaced freshly during a top-end rebuild.

Expert Pro-Tip: When installing your piston rings, pay close attention to the small identification markings near the ring gap end. These stamped marks must always face upward toward the cylinder head. Additionally, always make sure the ring ends seat perfectly over the anti-rotation locating pins in the piston ring grooves before attempting to slide the cylinder down over the top assembly.

Recommended Pairings:
o Kawasaki KX85 Performance Parts & Upgrades
o Kawasaki KX 2-Stroke Performance Parts
o Premium Motorcycle Chemicals & 2-Stroke Oil

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