1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 42Get this manual

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Figure 6 Idle Adjustment Screw MerCruiser 888-215-22511-TR and 255 II-TR
Figure 9 Typical Choke SettingMerCruiser 90-120-140160165888-2 15-22 Sll-TR and 255U-TR
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