If you do try the Lawnboy again maybe drop gas down the carburetor instead of Go Juice. To see if that will help. It would nice to see that thing run again. Especially since those are so rare.
That lawnboy is possibly late 50s, very early 60s. These brick tops are C Engines. Since they are a 3-ring piston design you have to run these on a richer mix than 32:1.
Excellent video Bah 53 :) also so far very good on those machines fire up and think Lawn Mower Lawn Boy need little help out on repairs and it be a go !
Clean the points on the lawn boy to get better spark and use some 2 cycle gas in the carb never want to use starting fluid don't have oil in it can damage the bearings on the crankshaft