40079M08300 Wiseco Std Piston for Kawasaki JT1500 Ultra 300LX 300X 83.00mm 8.4:1

Standard Piston for Kawasaki JT1500 Ultra 300LX/300X

This Wiseco standard piston, part number 40079M08300, is an 83.00mm bore piston with an 8.4:1 compression ratio built to replace the stock piston in Kawasaki JT1500 Ultra 300LX and 300X jet ski engines, restoring reliable compression and power.

Overview

This Wiseco standard piston for Kawasaki JT1500 delivers a direct-fit replacement for worn or damaged factory pistons in Ultra 300LX and 300X models. The 83.00mm bore and 8.4:1 compression ratio match original specifications so the engine runs as intended after a top-end rebuild. It suits riders and mechanics rebuilding a Kawasaki JT1500 who want a dependable standard-size piston.

Built For Performance

• Forged Wiseco construction for added strength under high rpm
• 83.00mm standard bore size matches original cylinder dimensions
• 8.4:1 compression ratio maintains factory engine tuning
• Direct replacement for OEM part number 40079M08300
• Designed for marine jet ski duty cycles and sustained load

Fits These Machines

• for Kawasaki JT1500 Ultra 300LX
• for Kawasaki JT1500 Ultra 300X

On-The-Job Use

• Top-end rebuilds on Kawasaki Ultra 300LX and 300X jet skis
• Restoring compression after piston scoring or ring wear
• Routine engine refresh during scheduled maintenance
• Replacing a failed stock piston with a durable forged unit

Specs At A Glance

Good To Know

Q: Is this piston a standard size or oversize? A: It is a standard 83.00mm bore piston meant to match original cylinder dimensions without overboring. Confirm your cylinder bore before ordering.

Q: Does this fit both the Ultra 300LX and 300X? A: Yes, this piston is listed for the Kawasaki JT1500 Ultra 300LX and 300X. Always verify your model and serial number 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.