1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 339Get this manual
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BATTERY CiIHAfIGING SYSTEM Th battery wll self -discharge wh,en the vehIc le isnot in uS9 For thiseason, charge tihe batt,e ry every two weeks to prevent sulfation rom occ,u rring Filling new 'batl:li