66E-11311-00-94 Engine Cylinder for Yamaha GP-R 800 2003-2005

Engine Cylinder for Yamaha

Engine cylinder for Yamaha personal watercraft, direct replacement for OEM part 66E-11311-00-94, built to restore compression and dependable power in your 800cc engine.

Overview

This engine cylinder for Yamaha is a replacement component for your 800cc personal watercraft engine, providing the bore surface and cooling passages that keep combustion stable and temperatures in check. It is built for riders who need to refresh or rebuild a worn top end on a Yamaha GP-R 800. The cylinder matches the OEM part number 66E-11311-00-94 for straightforward fitment.

Built For Performance

• Direct fitment for OEM part number 66E-11311-00-94
• Cast and machined to match the original bore dimensions for the 800cc engine
• Integrated cooling passages maintain consistent cylinder temperatures
• Robust wall thickness for durability under sustained load
• Precision machined mating surfaces for proper sealing with the head and gasket

Fits These Machines

• for Yamaha GP-R 800 (2003-2005)

On-The-Job Use

• Top end rebuilds on 800cc Yamaha personal watercraft
• Restoring lost compression on high hour engines
• Replacing a scored or damaged cylinder after a piston failure
• Routine maintenance on seasonally used watercraft

Specs At A Glance

Good To Know

Q: What should I check before installing this cylinder? A: Confirm piston size and bore clearance against your service manual and verify the part number 66E-11311-00-94 matches your engine. Clean the mating surfaces and use a fresh gasket during assembly.

Q: Does this cylinder include a piston or gasket kit? A: No, this listing is for the cylinder body only. Pistons, rings, bearings, and gaskets are typically ordered separately for a full top end rebuild.

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