Idle Drop Procedure


If the engine must be running to do some work, make sure the area is well ventilated. Never run the engine in an enclosed area. The exhaust contains poisonous carbon monoxide gas that may cause loss of consciousness and may lead to death. Run the engine in an open area or with an exhaust evacuation system in enclosed area.


• Make sure the carburetor synchronization is within specification before pilot screw adjustment (page 3-16).

• The pilot screws are factory pre-set. Adjustment is not necessary unless the carburetors are overhauled or new pilot screws are installed.

•The engine must be warm for accurate adjustment. Ten minutes of stop-and-go riding is sufficient.

• Use a tachometer with graduations of 50 rpm or smaller that will accurately indicate 50 rpm change.

I.Turn the pilot screw clockwise until it seats lightly, and then back it out to the specification given below.


Damage to the pilot screw seat will occur if the pilot screw is tightened against the seat.


Pilot screw wrench 07KMA MN90100


49 states/Canada type: 2-3/4 turns out California type: 2-1/2 turns out

07kma Mn9010007kma Mn90100


Pilot Screw Wrench 07kma Mn90100

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  • Serena
    How to adjust idle on a 98 cbr 1100xx?
    8 years ago

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