Some of the early flushable motors did not flush the lower unit and water pump, so be mindful of which you have...I'm like Spare...use the flush if ya wanna, but run 'em on the muffs too for the best clean out...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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