2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 10Get this manual
Break-In Procedure A new ATV and an overhauled ATV engine require "break-in" periodThe first 10 hours (or 200 miles) are most critical to the life of this ATV Proper operation during this break-in period will help assure maximum life and performance from the ATVDuring the first 10 hours (or 200 miles) of operation, always use less than 112 throttleVarying the engine RPM during the break-in period allows the components to "load" (aiding the mating process) and then "unload" (allowing components to cool)Although it is essential to place some stress on the engine components during break-in, care should be taken to overload the engine too oftenDo not pull traIler or carry heavy loads during the lO-hour break-in periodWhen the engine starts, allow it to warm up properlyIdle the engine several minutes until the engine has reached normal operating temperatureDo not idle the engine for excessively long periods of timeDuring the break-in period, maximum of 112 throttle is recommended; however, brief full-throttle tions and variations in driving speeds contnbute to good engine break-inDuring the break-in period (or whenever the brake pads are replaced), the hydraulic brake pads must be burnishedSlow disc-speed hydraulic brakes must be properly burnished in order to achieve maximum stopping power