1952 Mercury KH-7 KH7 Cruiser
Just got back from Mississauga after picking up my new motor, shot a vid.
KH7 History- Mercury racing outboards back in the 50's known as the KG7H/Q
Hurricane were the motor to beat. They were 10hp motors knows as the
"green top" motors, if you don't know much about Mercury's they put out
more like 16+ horsepower, they were the
sleeper motor of the day. The last production motor to have the Hurricane
20 CI powerhead with the integral gas tank was the KH7 Cruiser. Only built
in 1952 it was knows as the "transition motor". Features on the KH7 such as
forward , neutral and reverse as well as a twist grip throttle were not
found on the KG7. It was Mercury's plan to put these features on the 1951
version of the KG7 but were late in production so they included it on the
1952 model and renamed it the KH-7. The 1953 Model was the Mercury Mark 15
which used a remote fuel tank and included all the other features as the
KH-7. IMO this motor is relatively rare, research shows only 10,000 were
produced. This particular model was purchased from a collector in Ontario.
He bought it from a collector in the US. It has the factory lower unit
without the drill modification, does not have a telltale hole drilled in
the block like so many others and has the matching powerhead with lead plug
1957 Mercury Mark 10
I run my 1957 Mercury Mark 10 on my 1968 Montgomery Ward Sea King.
Motor details: Twin cylinder (alternate firing order),
forward-neutral-reverse shifting and throttle in the tiller handle,
trolling lever, 10hp @ 4,000 rpm, max 5,000 rpm, adjustable friction
co-pilot, vacuum fuel pump, two prop choices (two and three-blade).
Motor is original except for some assorted gaskets, fuel line, impeller,
tank hose and primer bulb, and fuel pump check valves.
The boat, named "Uncle Herbie" for my great-uncle, was purchased from a
friend for $150 and has a newly painted and textured floor, fuel tank
frame, reinforced and improved transom, and painted seats with no-sink foam
1949 Mercury KF7 Super 10 Lightning
If you like this video please vote for it in the Mercury Films Festival!
This Mercury KF7 Lightning has been completely rebuilt and has about 5
hours on it.The water was a little rough due to some wakeboarders, so it
was difficult to run at full throttle for an extended period.
1952 Mercury KH-7 IDLE SOLVED!!!!
Bought a new float to replace the old chipped cork float , still didn't
solve the pop and lack of idle. Did however notice that if I partially
close the choke it would idle down nice, obvious fuel/air mix issue. Pulled
out the idle orifice tube and found a tiny tiny pebble stuck in the bottom
of it. Blew it out, replaced the tube back in the carb, the video is the
result of finding that f****ng pebble!