RCB 9C-311

BULLETIN 9C-311

PAGE 4OF4

UNLOADER ADJUSTMENT

SETTING: 1955-56 - .360" -GAUGE, BT-108

With the throttle valves held wide open, the choke valve should be open just enough to admit the large end of Gauge BT-108, Dimension .360", between the upper edge of the choke valve and the inner air horn wall. To adjust, bend the tang on the throttle lever as shown with Bending Tool BT-69.

THROTTLE VALVES WIDE OPEN


	QUICK REFERENCE			SPECIFICATIONS
CARBURETOR No.		7005810	7006825	7008004	7008005	7008387	7008388
SMALL VENTURI		1/8"	1/8"	1/8"	1/8"	1/8"	1/8"
LARGE VENTURI		1-3/32"	1-3/32"	1-3/32"	1 -3/32"	1-3/32"	1-3/32"
MAIN METERING JETS		.052	.053"	.051	.052	.052	.052
IDLE NEEDLE HOLES		.040	.040	.040	.040	.040	.040
SEC. DISCHARGE HOLES	LOWER	.0285	.028	.0285	.028	.030	.028
	MIDDLE	.0265	.026	.0265	.026	.0255	.026
	UPPER	.0325	.028	.0325	.028	.030	.032
SPARK DRILLINGS		.040(2)	.040(2)	.040(2)	.040(2)	.040(2)	.040(2)
PUMP JETS		.028	.026	.026	.026	.026	.026
POWER RESTRICTIONS		.037	.037	.0335	.0335	.029	.038
CHOKE	CHANNEL	.089	.089	.089	.089	.089	.089
RESTRICTIONS	BY-PASS	.040	.040	.040	.040	.040	.040
IDLE TUBE RESTRICTIONS		.028	.030	.028	.030	.029	.028
ADJUSTMENTS		1955				1956
			DIMENSION		GAUGE No.	DIMENSION		GAUGE No.
FLOAT LEVEL		1-5/32"			BT-107	1 74"		BT-129
FLOAT DROP		1-29/32"			BT-107	1-29/32"		BT-1 29
PUMP ROD		15/16"			BT-1O7	57/64"		BT-129
AUTO CHOKE		INDEX				IINDEX
CHOKE ROD		.089			BT-108	.089		BT-108
UNLOADER		.360			BT-108	.360		BT-108
TUNE-UP		1955				1956
SPARK PLUG GAP		.035"				.035"
BREAKER POINT GAP		.016"				.016"
CAM DWELL			26° - 33°			26°-33°
IGNITION TIMING		4° B.T.C. @ IDLE				4° B.T.C. @ IDLE
IDLE R.P.M.		STANDARD—475 NEUTRAL				STANDARD—475 NEUTRAL
		POWERGLIDE—425 DRIVE				POWERGLIDE—425		DRIVE

CARBURETOR TOOLS AND GAUGES LISTED ARE AVAILABLE THROUGH UNITED MOTOR SERVICE

Rochester Carburetor

A GENERAL MOTORS PRODUCT — A UNITED MOTORS LINE

FORM 1228 l.P.S.

PRINTED IN U.S.A.