Mercury Outboard Boat

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Bob grubb's virtual Outboard Motor museum

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1947 Mercury KD-4S Rocket

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6 hp @ 4000 rpm  Serial #161730
This cosmetically unrestored motor is one of the last "silver" Mercury's.  The "S" in the model number meant it was equipped with a recoil starter.  I purchased this motor from a collector from NY in 1975.  I did not get around to getting it running until the year 2000.  After a small amount of running, it shuddered and stopped.  I found the crankshaft had broken!  I rebuilt it using another powerhead and the rebuild first ran in 2006 and occasionally since.