Honda BF75 BF100 Outboards Service Manual, Page 94Get this manual
HONDA BF75BF 00
2COOLING SYSTEM
Water is drawn into the water pump (2) from the port screen (1) under the anticavitation plateIt is then pumped through water pipe (3) into the water jackets (4) to cool the entire length of each cylinder wallAfter coaling the cylinders, the water is directed into the cylinder head (S), and from there back outside through the exhaust pipe
(7) with thQ QxhOilutt gas:gs:
A thermostat (5), located at the outlet of the cylinder jackets, opens and closes to the water temperature from the cylinder jackets to maintain constant cooling water temperatureWhen the water is coldit cannot pass into the cylinder head; That is, it is just circulated through tile intake manifold (111The water from the pump outlet is directly returned outside through the water check pipe (9) and exhaust pipe via the bypass tube (8)The pump is an impeller type and is located on the gear caseIt