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1959 Gray Marine YH Carburetor

1959 Gray Marine – Fireball 8, models 135 & 170

Carburetor number 2939S. 2618S along with a .082 jet was used as a replacement so you might see either carburetor.

Idle vacuum – 18 inches.
Flange – 1 3/4″, 3 bolt pattern.
Vented using an inside balance tube to air horn ahead of the choke valve.
Idle adjustment – 1/4 – 1 3/4 turns open. For richer mixture, turn screw out. Idle speed should be above 500 rpm in neutral.
Intake ball check in diaphragm housing – .115- .120″ diameter.
Choke – set on index.
Main jet – .082″

Adjustments

Float Level
With gasket removed, bowl cover inverted and float resting on pin in seated needle, the distance from the bowl cover to the top of float should be 9/16″. Do not depress float lip against spring loaded pin in needle, but let float rest on its own weight. Adjust by bending float lever.

Float Drop
With bowl cover assembly held in upright position, the distance between bottom of float (at free end) and bowl cover should be 2 1/8″. Adjust by bending stop tab on float arm.

YH Exploded

1-1027S Body flange assembly 63-178 Diaphragm spring retainer
1A-78 Fange gasket 75-1338 Metering rod standard .050″ x .039″
2-134 Throttle valve 100-16 Throttle lever adjusting screw
3-749S Throttle shaft and lever assembly 101-28 Throttle shaft arm attaching screw
7-107 Choke valve 101-136 Coil housing attaching screw
11B-69 Rivet plug 101-149S Body flange attaching screw and washer assembly
11B-79 Rivet plug 101-160S Bowl cover attaching screw and washer assembly
11B-220 Rivet plug 101-282S Diaphragm housing attaching screw and washer assembly
11B-223 Rivet plug 101-284 Piston housing attaching screw
11B-271 Idle port rivet plug 111-59S Metering rod arm assembly
14-433S Choke piston lever, link and shaft assembly 114-84S Throttle shaft arm assembly
15-35S Strainer nut assembly 115-165 Choke connector rod
17-51 Pump check needle 116-13 Pump intake check ball
20-22 Needle seat gasket 117-146 Pump lifter link
20-35 Bowl strainer gasket 117-148 Fast idle link
20-43 Piston housing gasket 117-154 Throttle shaft arm connector link
21-128S Float and lever assembly 120-158 Metering rod jet .082″
24-27 Float lever pin 121-185 Coil housing gasket
25-273S Needle pin, spring and seat assembly 121-209 Body flange gasket
30-14 Bowl strainer gauze 121-278 Body gasket
30A-44 Idle adjustment screw 146-241S Bowl cover and strainer assembly
39-10 Choke valve attaching screw 150-170 Choke piston pin
39-11 Throttle valve attaching screw 150A-10 Pin spring
47-14 Welsh plug 160-123 Choke piston
61-242 Metering rod spring 170-253S Piston housing and plug assembly
61-291 Throttle lever adjusting screw spring 170-274S Pump discharge housing assembly
61-389 Pump discharge spring 170AK-250S Thermostatic coil and housing assembly
61-390 Upper pump spring 172-24 Choke connector rod retainer
61-426 Idle adjustment screw spring 186-24 Coil housing baffle plate
63-58 Coil housing retainer 186-54 Fuel bowl baffle plate
63-104 Throttle shaft retaining ring 203-53S Pump discharge assembly
63-135 Upper pump spring retainer
Updated on 04/13/2022

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