RB Concept engines - Idle Needle; Idle Air Screw; Adjustable Spray Bar

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IDLE NEEDLE

2) The idle needle controls the amount of fuel going into the engine when

the throttle is fully closed. Turning this needle clockwise makes the fuel

mixture leaner, and turning it counter clockwise makes the fuel mixture

richer.

3) The idle air screw adjusts the opening gap when the throttle is in the

closed position and determines the idle rpm. Turning this screw clockwise

makes the idle rpm higher, and turning it counter-clockwise makes the

idle rpm lower.

IDLE AIR SCREW

AJUSTABLE SPRAY BAR

4) The adjustable spray bar, allows the adjustment of the position of the

spray bar inside the carburetor, and if you are not an experienced person

we suggest you leave this flush on the outside of the carburetor housing.