2006 Arctic Cat Y-6/Y-12 50cc and 90cc Service Manual, Page 19Get this manual
NOTE: Always compress the hydraulic brake lever several times to check that the brakes are firmIf the brakes are not firm, bleeding the system will be necessary (see BLEEDING in this sub-section) Break-In Procedure
A new ATV and an overhauled ATV engine require "break-in" periodThe first month is most critical to the life of this ATVProper operation during this break-in period will help assure maximum life and performance from the ATVDuring the first three hours of operation, always use less than 12 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 not to overload the engine too oftenWhen 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 timeAfter the completion of the break-in period, the engine oil should be changedOther maintenance after break-in should include checking of all prescribed adjustments and tightening of all fasteners