Inliners International Forums General Discussion Engines carb tuning: wideband AFR, plug reading, eyeball..

Tom,

Which wideband are you using?

Under cruise - the plugs should be white - most EFI systems will run the engine at 15:1 AFR. If the plugs are not overheating then your fine.

Under full power 12.5 to 12.8 is a good number. That is IF the intake manifold it distributing fuel equally.

The wideband will "average" all the cylinders.