Re: 1948 Elgin 3.5 hp first run issue

[Buccaneer]

Gas tank was shiny clean inside and I made a new in tank
screen. Will recheck the gas cap vent though.
It is a twin cylinder. Will look at the spark plugs.
It didn’t make any "mis-fire" noises, i.e., sputtering,
popping, etc. Just sounded like it went abruptly to half
throttle, then built back up to full speed, all in a matter
of ten seconds or so.

Prepare to be boarded!