R16 Twin Carburetor Tuning Update

I adjusted the carburetors. Based from the spark plugs, it was previously running lean at idle. I opened up the pilot screws out to 1/8 turn (the previous baseline setting was at 2.75 turns opened from fully closed position) to enrich the air-fuel mixture.

Lean mixture causing the center electrode of the spark plug to burn at a higher temperature shown by the white color on the ceramic casing.

Good burn indicated by the tan color on the electrode after adjusting the pilot screws 1/8 turn in open position.