Previously-published technical guides note that the engine’s timing is retarded 6-degrees as fuel flow is increased 5-percent more over the final “broken-in” operating tune during the first 2 hours of operation. ![]() This means that the ACE’s electroplated cylinder walls, piston rings and pins, main bearings and valvetrain require hours of heat cycling to properly seat into their machined surfaces – all of which, must be performed by the new owner/operator, meaning you. Rather, inside of the Rotax factory in Gunskirchen, Austria, each engine is checked for basic operation, proper oil and fuel pressure, as well as inspected for leaks prior to being shipped out for final assembly in Juarez, Mexico. ![]() We went to Middle Tennessee’s leading Sea-Doo dealer, America’s Motorsports in Madison to prepare our brand-new 2021 RXP-X 300.
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