There is what looks like a valve cap on the airflow meter (the big alloy box connected to the intake manifold with the large rubber bellow).

You remove the little cap and insert a long allan key (size 4, 5 or 6, check haynes). by turning the allan key you increase or reduce the backpressure on the airflap inside, thus changing the mixure. You need a CO meter to check correct setting. Basically you are best of having that done in a workship.

Timing is adjusted by moving the distributer housing with a strobe light on the crankshaft pully, just like in the old days with the breaker type. There are no fancy feed back loops or knock sensors to worry about. As it is breakerless it only needs adjusting once.

All is fairly basic, trick is to find a mechanic that still has the old tuning skills and doesn't cost an arm and a leg.

Reg,

Jorn, Oslo Norway