Our custom combination of +.200 longer Molnar connecting rods, combined with our custom .100 shorter Wiseco pistons, provides higher RPM and HP when used together.
• 1+ mm oversized valves
• Kelford cams, Beehive springs, and titanium retainers
• Kelford cams Stage 4 Billet Camshaft
•Stage 4 CNC Ported head
- Bronze valve guides
- CNC port
- 3-angle valve job
- equalized and evened out chambers
- machined to fit 1mm over valves
stage 4 upgrade
Our custom combination of +.200 longer Molnar connecting rods, combined with our custom .100 shorter Wiseco pistons, provides higher RPM and HP when used together.
• 1+ mm oversized valves
• Kelford cams, Beehive springs, and titanium retainers
• Kelford cams Stage 4 Billet Camshaft
•Stage 4 CNC Ported head
Bronze valve guides
CNC port
3-angle valve job
equalized and evened out chambers
machined to fit 1mm over valves
This setup could be used on 93 to 100 octane fuel or E85
*Ruthless Racing SEA-DOO Carbon Fiber Rear Air Intake Kit:" The rear air intake kit provides direct, high-volume air to your supercharged engine, resulting in significantly improved acceleration and top speed. It replaces the restrictive stock air box with a 4-inch Marine Grade K&N air filter for easy installation and a clean look, giving you access to your engine compartment."
*Ruthless Racing Pitch Solas CUSTOM Concord Impeller: Increases low-end thrust and top-end speed on Sea-Doo 300 HP PWCs. Constructed of high strength stainless steel, Solas Impellers feature a polished hub and exclusive hub-end water seal for reduced cavitation.
*Ruthless Racing SEA-DOO 300 Open Loop Cooling Kit: Our Sea-Doo 230/300 Open Loop Cooling Kit dramatically reduces engine operating temperatures for improved performance and reliability. It includes an adjustable water flow regulator for optimum temperature control. The original closed-loop system quickly becomes heat-soaked in high-performance applications. The open-loop system increases cooling efficiency via a steady supply of cool external water.
*RUTHLESS SEA-DOO 4-TEC 4-BOLT SUPER PUMP SEAL (Launch Pump Seal):
PERFECT FOR LAUNCHING 🚀 ZERO CAVITATION
These upgraded performance seals replace the weak OEM seal that often fails in performance applications, providing better acceleration and reduced cavitation.
*ARP SEA-DOO 1503/1630 CYLINDER HEAD STUD KIT:
"An ultra-high-strength cylinder head stud kit is essential when upgrading internal components on your high-boost Sea-Doo engine. These studs are precision-machined from premium grade 8740 alloy and heat-treated to exacting tolerances, resulting in dramatically increased reliability and ease of maintenance."
*NGK Iridium IX Racing Spark Plug - for 300/325 Pack of 3:
NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.
*Ruthless Racing SEA-DOO 2018 to 2025 RXPX SINGLE REAR EXHAUST KIT
*FUELTECH NANO WIDEBAND W/ 02 sensor & 6FT HARNESS KIT
This setup could be used on 93 to 100 octane fuel or E85
-Send your factory head to our shop after making a purchase. The exchange will be prompt. We will send the cylinder head after receiving yours. PLEASE CALL IF YOU HAVE ANY QUESTIONS.