Vertex Complete Engine Rebuild Kit WR101-052 - Kawasaki KX85 2007-2013

Product Description

The Vertex WR101-052 Complete Engine Rebuild Kit provides a full-service mechanical overhaul package for Kawasaki 85cc two-stroke minicycles. Engineered specifically for 2007 to 2013 KX85 models, this kit packs every essential bottom-end and top-end replacement component into a single package. At the top end, a precision-matched Vertex piston kit featuring a standard compression piston, rings, wrist pin, and circlips restores factory cylinder sealing, compression ratios, and responsive throttle power across the powerband.

The rotating bottom-end assembly is anchored by a Hot Rods heavy-duty stock stroke crankshaft paired with a heavy-duty wrist pin bearing. Engine durability and smooth gearbox action are maintained through a Hot Rods transmission bearing kit that includes complete transmission bearings, an output shaft collar, and a sprocket lock washer, as well as a counter balancer bearing kit. A full Vertex gasket set, complete oil seal kit, main bearings, and a water pump rebuild kit deliver airtight crankcase crank chamber integrity and reliable coolant retention throughout demanding race conditions.

Top Features: Vertex Complete Engine Rebuild Kit

• All-inclusive two-stroke engine rebuild package combining top-end and lower-end rotating components.
• Vertex standard compression piston kit supplied complete with rings, wrist pin, and clips.
• Hot Rods heavy-duty stock stroke crankshaft assembly including small-end wrist pin bearing.
• Comprehensive transmission bearing package featuring main bearings, counter balancer bearings, and countershaft seal kit.
• Complete top and bottom Vertex engine gasket kit with full oil seal set and water pump rebuild kit.

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

Fitment List

Frequently Asked Questions

Q: What main assemblies are supplied in the WR101-052 package?
A: The kit comes complete with a Hot Rods crankshaft assembly, Vertex piston kit, complete gasket kit, oil seals, main bearings, transmission bearings, water pump rebuild kit, and wrist pin bearing.

Q: Does this kit change the factory engine displacement or stroke?
A: No, this kit uses a standard compression piston and a stock stroke heavy-duty crankshaft designed to maintain original 85cc factory engine specifications.

Q: Does the transmission kit include the output shaft hardware?
A: Yes, the transmission bearing kit includes the full set of transmission bearings, the output shaft collar, and the sprocket lock washer.

Expert Pro-Tip: When performing a full crankcase rebuild on a KX85, avoid drawing the case halves together using the case bolts, which can misalign bearings or side-load the crankshaft webs. Use dedicated crankcase assembly tools to draw the crankshaft into the main bearings, and freeze the bearings while gently warming the aluminum cases for a smooth, drop-in fit. Always lubricate the small-end wrist pin needle bearing with quality two-stroke oil before final cylinder installation to prevent dry scuffing during initial startup.

Recommended Pairings:

• Kawasaki KX85 Performance Parts & Upgrades
• Kawasaki 2-Stroke Performance Parts
• Motorcycle Tools Performance Parts & Upgrades

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