My Johnson has low compression! Let's try both Marvel Mystery Oil and Johnson/Evinrude Engine Tuner to see if they help.

Johnson playlist:    • Johnson Outboard  

Entire Johnson engine series:
Part 1:    • 1952 Johnson Outboard sitting 47 year...  
Part 2:    • 1952 Johnson Outboard.  Will it Run a...  
Part 3:    • My Johnson Needs An Overhaul, and it'...  
Part 4:    • Understanding 2 Stroke Engines vs 4 S...  
Part 5:    • Does Marvel Mystery Oil Actually Work...  
Part 6:    • Total Rebuild Of My Two Stroke Johnso...  
Part 7:    • Repairing a 1952 Johnson Outboard Engine  

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Unfortunately with only 1 engine worth of data, there's no way to get a real answer as to whether the products work or not. They might work very well, just not in this case.