Re: Newer 18hp carb on an early 60’s Johnson 18?

[johnyrude200]

Well I gave the motor a run today and it all worked out, so that is a viable compatibility option for those who wish to do so. You’ll have to do the modification to the carb orifices and nuts to account for the narrower intake on the older motors, but it works.

It took a little bit longer to get the link and sync set up properly, but it idles down fine and runs smooth at all ranges.

I will note that with the early 70’s 18hp carb, this early 60’s motor behaves much like the 70’s version in that when cold, they can stall out suddenly, and blubber initially when throttling up fast from idle. Out goes a big plume of smoke, then the motor clears out and runs as usual.