Mercury Force 9.9, 15HP Outboards Service Manual, Page 41Get this manual
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JADJUSTING IDLE SPEED NOTE: Idle RPM, in neutral, should be 8001,000 RPMIf adj ustment is requiredShift into gearAdj ust idl SlOp scre (A) to proper positi on (idle 6()()-700 RPM in gear)=