Reply To: 1958 envinrude 35 HP big twin running rough

[David Stanton]

After reading your post again, since you had it running great at first, I’d first check your points adjustment again and if that doesn’t fix it, go back into the carb and look for any small fleck of dirt, and spray carb cleaner through all passages again with needle valves removed. With new gas lines, I’d be suspicious of small rubber fragments shaved loose when pushing gas lines onto mating nipples. This can happen downstream of the filter. That bit me twice this summer.
Dave