I BOUGHT THE 4 HP JOHNSON AT A YARD SALE, IT WAS STUCK. GOT IT WORKING. NEED NEW FLOAT FOR CARB. MOD# 4W71D SER# E3863954 HOW OLD? THE 25 HP JOHNSON I GOT IN A JUNK PILE. THE LOWER UNIT WAS STUCK IN GEAR. I GOT IT FREED UP. NOW WORKING ON POWERHEAD. IT WAS ALL APPART. HOW OLD IS THIS ONE? MOD# 25R77S SER# E4682462 THANK YOU.