Description

Sea-Doo RXT X 300 Engine Rebuild Service (2016–2023)

The Sea-Doo RXT X 300 is built for strong acceleration, sharp throttle response, and steady 300-class performance. However, when internal wear starts to build up, you may notice rough starts, weaker response, or power that feels less consistent under load.

At REV6, we tear your engine down completely, inspect every key component, and rebuild it with refreshed internals and corrected clearances. As a result, your RXT X 300 runs cleaner, responds sharper, and gives you confidence every time you hit the water.

Core Requirement

Core required: A rebuildable Sea-Doo RXT X 300 engine core must be supplied for this service. Once your order is placed, we’ll send a prepaid shipping label and coordinate pickup.

Before shipping, remove your exhaust, fuel-related components, electrical parts, and sensors. After that, we handle the rest—from teardown to final rebuild and return shipping.

For step-by-step instructions, visit our Help Center.

If you want to spread out the cost, check out our flexible payment options to keep your rebuild moving.

What’s Included in the Rebuild

• Standard 1-year warranty with optional 2-year no-fault upgrade
• Full inspection of engine core
• Crankcase assembly inspected and refurbished
• Crankshaft assembly inspected and rebuilt
• New high-babbitt crankshaft bearings installed
• Cylinders bored and honed to the next oversize as needed
• New pistons, rings, and wrist pins installed
• Cylinder head rebuilt and resurfaced
• Valve guides inspected and replaced as needed
• Valves and seats recut and vacuum tested for proper sealing
• Camshaft cleaned, inspected, and polished
• Mating surfaces decked and resurfaced for a tight seal
• Timing chain inspected and replaced when needed
• New gaskets and oil seals throughout
• All bearings cleaned, inspected, and replaced as needed
• Assembly completed by a master technician
• Double inspection before shipment

Note: Final build details depend on your engine’s condition.

Built for X-Series Water Performance

The RXT X 300 needs clean starts, strong sealing, accurate bearing fitment, and proper internal clearances to stay consistent during hard use. Because of that, we focus on crankshaft condition, piston fitment, cylinder sealing, gasket integrity, and case health throughout the rebuild.

In turn, your rebuilt engine delivers smoother operation, sharper response, and dependable performance when the machine is working hard.

Turnaround Time

Typical turnaround time is about 2 weeks after your engine core arrives, depending on the condition of your core and parts availability.

Warranty & Support

Every rebuild includes a 1-year warranty. In addition, you can upgrade to a 2-year no-fault plan for extra protection.

Review coverage in our warranty policy, browse answers in our FAQ, or contact our team before ordering.

For first-start guidance, follow our engine break-in procedure. You can also visit the REV6 Blog or watch rebuild content on our YouTube channel.

Need Help Choosing the Right Option?

If you’re comparing rebuild paths or parts options, our Engine Rebuild Kit Guide can help you understand what fits your repair best.

Take Action

If your RXT X 300 is starting rough, losing response, or not running as clean as it should, now’s the time to rebuild it the right way.

Get back on the water with sharp throttle response, smooth acceleration, and confidence in your rebuilt engine.

We proudly support veterans and active servicemembers with available discounts—thank you for your service.