Reply To: Johnson FD-12 Won’t Run

[Bob Wight]

With the original air pulse pump fed from the air nipple on the manifold, I had removed the reed plate check valves and plugged one of the two ports to get pressure and vacuum off one cylinder (I’ve used this approach on several other motors when I used an air pulse pump).  See pic of reed plate plug.

 

In the 2nd test run with the new pump fed from the bypass cover, I left the reed plate plug in place and capped off the air nipple on the manifold.   Not sure if it will make a difference, but today I pulled the manifold and reed plate and re-installed the check valves on the reed plate.   In pulling the manifold and reed plate off, I also opened up the carburetor again just to make sure nothing was amiss there – it all seems OK.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."