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With a Commando engine you will always need to jet on the rich side of maximum power to avoid piston damage.How rich depends on the piston in use.Most engines will do OK with full throttle mixture around 12.8 or 13 to 1.Maximum power seems to be about 13.3 to 13.5 to 1.To darken a plug's insulator immediately with unleaded fuel requires a mixture around 11.5 to 1.[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/main-jet-test.22045/post-329307[/URL]
With a Commando engine you will always need to jet on the rich side of maximum power to avoid piston damage.
How rich depends on the piston in use.
Most engines will do OK with full throttle mixture around 12.8 or 13 to 1.
Maximum power seems to be about 13.3 to 13.5 to 1.
To darken a plug's insulator immediately with unleaded fuel requires a mixture around 11.5 to 1.
[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/main-jet-test.22045/post-329307[/URL]
