2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 147Get this manual

2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 147

ENGINE Balance Shaft Installation See "Balance Shaft Timing" on page 5.561Balance shafts are identical but should be installed
until SINGLE dot on crankshaft gear is visibleAlign single dot of drive gear between two dots of balance gearAlign bearing
locating ring in groove on crankcase and fully seat the shaftVerify balance shaft timing is correct by comparing to illustration