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Those are for attaching a CO meter to adjust the fuel mixtures. Quoting from the factory service manual: "CAUTION: It is not possible to accurately gauge the setting of each individual carburettor using a CO meter which takes a measurement solely from the silencer outlet. A meter which is adapted to take measurement from the exhaust downpipe for each individual cylinder must be used. Using the silencer outlet to measure CO will result in incorrect mixture adjustment, high fuel consumption, high CO emissions and rough running."

Correct mixture setting (outside USA)
2.5 - 4.5% CO at idle (950-1050 RPM)

Correct mixture setting (USA)
1.0% CO at idle (950-1050 RPM)
 
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