Cylinder Piston Gasket Top End Kit For HiSUN UTV ATV MSU400 YS400 84.34mm Bore

Top End Kit for HiSUN UTV ATV MSU400 YS400

This cylinder piston gasket top end kit restores compression and sealing on 84.34mm bore engines found in HiSUN and Massimo 400 UTV and ATV models.

Overview

This top end kit delivers the cylinder, piston, and gasket components needed to refresh worn 400-class engines. It serves riders and mechanics rebuilding HiSUN or Massimo UTV and ATV powerplants that have lost compression or are burning oil. Each kit is sized to the 84.34mm bore so the top end goes back together with correct clearances.

Built For Performance

• 84.34mm bore sizing matched to the 400cc engine platform
• Cylinder, piston, and gasket set combined in one top end package
• Piston machined for proper ring land fit and compression sealing
• Gaskets cut to seal the cylinder base and head joints
• Components sized for the HiSUN and Massimo 400 engine family
• Serviceable replacement parts for rebuilt or refreshed top ends

Fits These Machines

• for HiSUN UTV 400 models
• for HiSUN ATV 400 models
• for Massimo 400 models
• for MSU400 machines
• for YS400 machines

On-The-Job Use

• Top end rebuilds after low compression or oil consumption
• Routine engine refresh on high-hour UTV and ATV units
• Workshop repairs on HiSUN and Massimo 400 engines
• Restoring power for trail, farm, and utility riding

Specs At A Glance

Good To Know

Q: What does a top end kit include? A: It groups the cylinder, piston, and gaskets needed to reseal and refresh the upper half of the engine. Confirm bore size against your original cylinder before ordering.

Q: How do I know this kit fits my machine? A: Match the 84.34mm bore and the MSU400 or YS400 model listing to your unit. Serial number and production run can affect fit, so verify before purchase.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.