‘73 20hp carb help

JasonB

Lieutenant
Joined
Feb 10, 2003
Messages
1,467
Picked up the motor in the title. It has a BA-1A carb. I bought a rebuild kit and found a couple differences. 1- the carb as I got it seemed to have 2 fuel diagrams in the pump. Kit came with one, so that’s what I put back in. 2- The kit, which was listed as a Tillotson kit for this carb included a new needle. It’s a different style. The one in the carb is longer with no spring. The new one is shorter with a spring on top. I put it in and adjusted the float so the seam is parallel to the body when holding it upside down. The drop is maybe 1/2-3/4”

I put everything together and it runs, but is far from right. It will start, but will only run at a fast idle and eventually Boggs out unless I work the throttle a bit.

Should I be concerned about the different style needle and what should the float adjustment be?

It ran better before rebuild, even with trash in it.
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
14,238
A Serial # for the Motor would make it easier to find which Carb Kit is required
The Rebuild Kit you purchased, was it a Genuine Mercury/Quicksilver Kit, or a 3rd Party Kit?
Also when you reinstalled the Carb, did you verify the Sync between the Carb, and the Ignition Advance?

What condition, mechanically, is the Engine in?
Compression #s?
Can the Spark on both Plug Wires, jump a 7/16" Gap?
 
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