Carburetor - Rochester e4me & e4med 4-bbl GMC Cab & Chassis S15

COMPONENT TESTING

Note. Specific component testing information not available. Refer to tests performed under TESTING .

APPLICATION

GENERAL MOTORS (ROCHESTER) CARBURETOR NO.

IDENTIFICATION

The Rochester E4ME or E4MED carburetor number is stamped on the float bowl, near secondary throttle. (Scheme 12) If float bowl is replaced, follow manufacturer's instructions to transfer part number to new float bowl. Some models have machined pump wells to reduce the pump well taper.

The E4ME and E4MED Quadrajet carburetors are used on California light duty trucks with the Computer Command Control (CCC) system. Most light duty trucks with 5.7 application use California engines with CCC. The first letter "E" indicates the carburetor is a part of the CCC system.

Carburetor Identification Label. Scheme 12

Note. Transfer part number if float bowl is replaced.

DESCRIPTION

The E4ME and E4MED carburetors are a 2-stage, downdraft design. Each bore has a triple venturi system. The secondary side has 2 large throttle bores. Fuel metering is based upon the amount of air passing through the secondary bores. A baffle is attached to the secondary system, above the main well bleed tubes. This deflects incoming air to improve secondary nozzle operation on heavy acceleration.

The E4ME and E4MED carburetors use an electrically-actuated choke assembly, and 2 vacuum break diaphragm assemblies. Both models are used in conjunction with the Computer Command Control (CCC) System. The carburetors are equipped with an electrically-actuated mixture control solenoid mounted in the float bowl. Fuel metering is controlled by stepped metering rods that operate in removable jets.

The E4MED model carburetor incorporates a float bowl mounted dual capacity fuel pump and a combined mixture control/dual capacity pump solenoid assembly. The dual capacity pump is controlled by the coolant temperature sensor. As coolant temperature approaches 170°F (77°C), an internal solenoid is energized, opening a by-pass valve. Pump capacity is reduced by about one-half.

Carburetors may be equipped with an Idle Speed Control (ISC) unit mounted on the fuel bowl. Controlled by the ECM, the ISC maintains curb idle speed and acts as a dashpot on deceleration. On A/C equipped vehicles without ISC, an Idle Speed Solenoid (ISS) controls idle speed during A/C operation.

ELECTRIC CHOKE

Note. Preferred air temperature for this test procedure is 60-80°F (15-27°C).

1. Engine must be cool so that choke plate is closed when throttle is partially opened. Start engine and time the interval required for choke plate to reach full open position. If choke plate does not fully open within 3-1/2 minutes, proceed with test.
2. With engine running, check voltage at choke heater connection. If voltage is over 12 volts, replace electric choke unit. If voltage is low or zero, check wiring harness and repair as necessary.
3. Choke unit power supply is through the oil pressure switch. Ensure switch circuitry is good. If procedure in step 2 does not correct the problem, replace oil pressure switch.

ADJUSTMENTS

Note. For all on-vehicle adjustments not covered in this article, see appropriate TUNE-UP article.

FLOAT LEVEL (EXTERNAL CHECK)

1. Remove air cleaner and gasket. Insert Float Gauge (J-34935-1) down "D" shaped vent hole. Lightly press down on float gauge and release. Ensure that gauge moves freely and does not bind. (Scheme 12)
2. With float gauge released, start engine and allow to idle. Read gauge at point that lines up with top of air horn casting. Float level must be within 1/16" (1.6 mm) of specification.

Wet Float Level Adjustment. Scheme 13

CHOKE VALVE ANGLE GAUGE

Note. Allow float gauge to float freely.

Carburetor adjustments be performed using a Choke Valve Angle Gauge (J-26701). Preparations and actual adjustment may vary with application, however, procedure for using the angle gauge to inspect choke valve angle remains the same. (Scheme 13)

1) With choke valve closed, place angle gauge magnet squarely on choke valve. Align degree scale on angle gauge so that 0°

mark is opposite pointer. Rotate leveling bubble on angle gauge to center.

2) Align specified degree mark 180° opposite pointer. Perform individual adjustment preparation as necessary. If bubble is centered, adjustment is correct. If not, adjust carburetor using appropriate adjustment procedure.

Choke Valve Angle Gauge. Scheme 14

Note. This gauge must be used to perform some adjustments.

AUTOMATIC CHOKE

Choke coil cover is attached with rivets. Adjustment is not required. If removal of choke coil cover is necessary, refer to DISASSEMBLY and REASSEMBLY procedures under OVERHAUL in this article. Remove choke cover only if major overhaul or choke cover replacement is required.

CHOKE UNLOADER

Note. Choke coil lever and choke rod (fast idle cam) adjustments must be correct before proceeding with adjustment. Adjustment is performed with choke valve angle gauge. DO NOT remove choke cover for this adjustment.

1. Attach rubber band to Green tang of intermediate choke shaft. Open throttle to allow choke valve to close. Set up angle gauge. Hold secondary lock-out lever away from pin. (Scheme 15)
2. Hold throttle lever in wide open position. To adjust unloader, bend choke unloader tang on fast idle lever until bubble of choke valve angle gauge is centered. Remove gauge.

Choke Unloader Adjustment. Scheme 15

CHOKE COIL LEVER

Note. Choke cover gasket must not interfere with ground contact provided by metal plate at rear of cover assembly.

1. Remove retaining rivets and choke cover with coil assembly. Position fast idle cam follower on high step of cam. Push up (counterclockwise) on choke coil tang to close choke valve. (Scheme 16)
2. Insert a.120" drill or pin gauge in hole provided in choke housing. Lower edge of choke lever inside housing should just touch drill or pin gauge. To adjust lever, bend choke rod. (Scheme 16)

Choke Coil Lever Adjustment. Scheme 16

CHOKE ROD (FAST IDLE CAM)

Note. Choke coil lever must be adjusted before servicing choke rod. Adjustment is performed with choke valve angle gauge. DO NOT remove choke cover rivets for this adjustment.

1. Attach rubber band to Green tang of intermediate choke shaft. Open throttle to allow choke valve to close. Set up angle gauge. Place fast idle speed cam follower on second step of fast idle cam against shoulder of highest step.
2. If cam follower does not contact cam, turn in fast idle speed screw additional turns. (Scheme 17) To adjust rod, bend tang on fast idle cam until bubble of choke valve angle gauge is centered.

Choke Rod (Fast Idle Cam) Adjustment. Scheme 17

PRIMARY (FRONT) VACUUM BREAK

Note. Choke adjustments should be correct prior to this adjustment. Use choke valve angle gauge but do not remove choke cover.

1. Attach rubber band to Green tang of intermediate choke shaft. Open throttle to allow choke valve to close. Set up angle gauge.
2. Using an outside vacuum source of at least 18 in. Hg, seat primary (front) vacuum break diaphragm. If air valve rod restricts vacuum break plunger from being seated, bend rod to allow full plunger travel. Be sure leaf bucking spring is seated against lever, (if equipped). (Scheme 18)
3. On models equipped with air bleed, remove rubber cover from filter and plug vacuum tube. If bleed hole is in end of diaphragm, plug hole with a piece of tape. Remove tape after completing adjustment.
4. To adjust, turn vacuum break adjustment screw with vacuum still applied. Adjustment is correct when bubble of choke valve angle gauge is centered.

Primary (Front) Vacuum Break Adjustment. Scheme 18

SECONDARY (REAR) VACUUM BREAK

Note. Choke adjustments should be correct prior to this adjustment. Use choke valve angle gauge but do not remove choke cover.

1. Attach rubber band to Green tang of intermediate choke shaft. Open throttle to allow choke valve to close. Set up angle gauge.
2. Use an outside vacuum source to supply 18 in. Hg vacuum. Seat secondary (rear) vacuum break diaphragm. If air valve rod restricts vacuum break plunger from being seated, bend rod to allow full plunger travel. (Scheme 26)
3. On models equipped with air bleed, remove rubber cover from filter and plug vacuum tube. If bleed hole is in end of diaphragm, plug hole with a piece of tape. Remove tape after completing adjustment. NOTE: On delay models with air bleed, plug end cover with an accelerator pump plunger cup. Remove tape or cup after completion of adjustment.
4. On models equipped with hex adjustment, use a 1/8" hex wrench to adjust screw in rear cover of vacuum break with vacuum applied. Adjustment is correct when bubble of choke valve angle gauge is centered.
5. On models without hex adjustment, support rod at "S" and bend vacuum break rod with vacuum applied. Adjustment is complete when bubble of choke valve angle gauge is centered.

FLOAT LEVEL (DRY SETTING)

1. Remove air horn and gasket. Remove solenoid plunger, metering rod, and float bowl insert. If it is necessary to remove solenoid adjustment screw, count and record revolutions necessary to softly bottom screw using Mixture Adjustment Wrench (J-28696-10). (Scheme 19)
2. Install Adjustment Base (J-34817-1) to float bowl. Position Float Weight (J-34817-3) in base with contact pin idle on outside edge of float lever. Using Float Adjustment Gauge (J-9789-90), measure distance from top of casting to surface of float at 3/16" (4.7 mm) from top of casting to surface of float at 3/16" (4.7 mm) from large end of float.
3. If float level is over 1/16" (1.6 mm) out of specification, use Float Lever Bender (J-34817-15) to adjust float as necessary. Remove bender and measure to confirm that float level is within specification.
4. Check float alignment. Return solenoid lean mixture adjustment screw to original position (turns recorded during removal). Reassemble carburetor.

Dry Float Level Adjustment. Scheme 19

MIXTURE CONTROL SOLENOID PLUNGER TRAVEL

Note. This preliminary adjustment is required so that mixture control solenoid is near specifications before final adjustment. Final adjustment is made with carburetor installed and engine running. See appropriate TUNE-UP article.

Scheme 20

Scheme 21

1. Remove air horn, solenoid mixture screw, rich limit stop, solenoid plunger, metering rod with springs and mixture control solenoid. (Scheme 20)
2. Inspect mixture control solenoid bore and plunger for wear or sticking. Check metering rods for sticking, improperly installed springs, foreign material in jets or incorrect part number. (Scheme 20): Removing Mixture Control Solenoid
3. Position Mixture Control Solenoid Gauge (J-33815-1) over the throttle side metering jet rod guide. Temporarily install mixture control solenoid assembly in float chamber. Align solenoid end pin with hole centered in boss on bowl floor. (Scheme 21)
4. Hold solenoid plunger "DOWN" with light finger pressure and as close to plunger shaft as possible. Using Wrench (J-28696-10), slowly turn solenoid adjustment screw clockwise until plunger contacts gauge. (Scheme 22)
5. Slowly turn solenoid adjustment screw counterclockwise until the plunger breaks contact with gauge. The adjustment is correct when solenoid plunger is contacting both the solenoid stop and gauge. (Scheme 21): Installing Mixture Control Solenoid Gauge
6. Note position of "T" handle on wrench. Count and record the number of turns required to turn the solenoid adjustment screw clockwise until the solenoid bottoms out against float bowl.
7. Remove solenoid adjustment screw, rich limit stop, mixture control solenoid, plunger, solenoid adjustment screw spring, and gauge. Install solenoid adjustment screw spring, mixture control solenoid, and plastic filler block.
8. Install primary metering rods and springs. Install mixture control solenoid plunger, rich limit stop, and solenoid adjustment screw. Using wrench, turn solenoid adjustment screw clockwise until mixture control solenoid bottoms out against float bowl.
9. Turn wrench counterclockwise the exact number of turns recorded in step 6. Install new air horn gasket and install air horn on carburetor. Tighten carburetor screws using tightening sequence. (Scheme 32)

Adjusting Mixture Control Solenoid. Scheme 22

SOLENOID RICH MIXTURE STOP SCREW

Note. This preliminary bench adjustment is required so that solenoid rich mixture stop screw is near specification before final adjustment. Final adjustment is made with carburetor installed and engine running. See appropriate TUNE-UP article.

Scheme 23

1. With mixture control solenoid plunger travel properly set and air horn installed, insert Float Gauge (J-34935-1) in vertical "D" shaped vent hole in air horn casting.
2. With gauge installed, read mark on gauge that lines up with top of air horn casting. Record reading. Lightly depress float gauge and again read mark on gauge that lines up with top of casting. Record reading. (Scheme 23): Solenoid Rich Mixture Stop Screw Adjustment
3. Record the difference of 2 readings taken in step 2. This difference is the total solenoid travel. Using Mixture Adjustment Wrench (J-28696-10), turn rich mixture stop screw until total solenoid travel (difference between readings) is 1/8" (3.2 mm). (Scheme 23)
4. After adjustment, install lean mixture screw and solenoid rich mixture stop screw plugs. Plugs are installed to seal settings and prevent fuel vapor loss. (Scheme 24)

Installing Mixture Stop Screw Plugs. Scheme 24

IDLE MIXTURE SCREWS & AIR BLEED VALVE (BENCH ADJUSTMENTS)

Note. This preliminary adjustment is required so that mixture screws and idle air bleed valve are near specifications before final adjustment. Final adjustment is made with carburetor installed and engine running. See appropriate TUNE-UP article.

1. With idle mixture plugs removed, lightly seat idle mixture needles. Using Idle Mixture Socket (J29030), back off each screw 3 turns to complete initial adjustment.
2. The idle air bleed valve is sealed with a riveted cover. If idle air bleed cover was previously removed, proceed to step 3. Shield air horn with shop towel to prevent chips and debris from entering carburetor. Drill out rivets and remove remaining segments with a drift and small hammer.
3. To adjust air bleed valve, insert idle Air Bleed Valve Gauge (J-33815-2) in throttle side "D" shaped vent hole of air horn casting. Place upper end of tool over cavity next to valve. (Scheme 25)
4. Lightly push down on gauge so that solenoid plunger is against solenoid stop. Adjust idle air bleed valve so that gauge will pivot to contact top of air bleed valve. (Scheme 25) No additional adjustment is necessary.

Idle Mixture and Air Bleed Valve Adjustment. Scheme 25

Secondary (Rear) Vacuum Break Adjustment. Scheme 26

AIR VALVE ROD - FRONT

1. Use vacuum pump to apply 18 in. Hg vacuum to dashpot. (Scheme 27) With primary (front) vacuum break diaphragm seated, plug air bleed hole (if equipped) with tape. Hole is located in end of diaphragm.
2. Make sure air valve is completely closed. Measure clearance between rod and end of slot in lever. Clearance can be checked using a.025" drill or pin gauge. (Scheme 27)
3. Bend rod to adjust clearance in slot to.025" with vacuum still applied. Remove tape and reconnect vacuum hose to diaphragm.

Air Valve Rod Adjustment (Front). Scheme 27

AIR VALVE ROD - REAR

1. Use vacuum pump to apply 18 in. Hg vacuum to dashpot. (Scheme 28) With secondary (rear) vacuum break diaphragm seated, plug purge bleed hole (if equipped) with masking tape. Hole is located in end of diaphragm.
2. Make sure air valve is completely closed. Measure clearance between rod and end of slot in lever. Clearance can be checked using a specified drill or pin gauge. (Scheme 28)
3. Bend rod at point shown to adjust clearance in slot to.025" with vacuum applied. Remove tape and reconnect vacuum hose to diaphragm.

Air Valve Rod Adjustment (Rear). Scheme 28

SECONDARY THROTTLE VALVE LOCK-OUT

1. To adjust lock-out lever side clearance, hold choke valve and throttle valves completely closed. (Scheme 29) Measure side clearance between pin and lock-out lever. Specified lock-out lever side clearance is.015". To adjust, bend pin.
2. To adjust lock-out lever opening clearance, push down on tail of fast idle cam and open choke valve completely. Measure opening clearance between end of pin and toe of lock-out lever. Specified clearance is.015". To adjust, file end of lock-out pin. Make sure all burrs are removed.

Secondary Throttle Valve Lock-Out Adjustment. Scheme 29

DISASSEMBLY

Note. Before servicing, carburetor should be placed on Holding Fixture (J-9789-118) to prevent damaging throttle valves.

Air Horn

1. Remove ISC or ISS bracket and assembly. Remove upper choke lever from choke shaft by removing retaining screw. Rotate upper choke lever to remove choke rod from slot in lever.
2. Remove choke link from lower lever inside float bowl casting. Remove link by holding lower lever outward with small screwdriver and twisting link counterclockwise.
3. Disconnect secondary metering rods by removing small screw in top of metering rod hanger. Lift up on rod hanger until secondary rods clear air horn. Metering rods are removed from hanger by rotating ends out of hanger holes.
4. Remove pump link retainer. Remove link from pump lever. Remove vacuum hose from front vacuum break unit and note location for reassembly reference. Remove 11 air horn screws and 2 countersunk screws located near venturi. NOTE: DO NOT remove pump lever from air horn or possible damage to air horn could result. Use care not to damage mixture control solenoid connector, TPS adjustment lever, and small tubes protruding from air horn. DO NOT attempt to remove tubes.
5. Remove secondary air baffle deflector (if equipped) from beneath 2 center air horn screws. Remove air horn from float bowl by lifting straight up. Air horn gasket should remain on float bowl.
6. Remove primary (front) vacuum break diaphragm. Remove air valve rod from vacuum break and air valve lever. Use fingers to remove TPS plunger by pushing plunger up through air horn seal.
7. Invert air horn and remove staking that holds TPS seal and pump plunger stem seal retainers. Use care when removing retainers and seals to prevent damage to air horn casting. Discard retainers and seals. Use a small punch to drive solenoid adjustment screw plug out of air horn and discard.
8. Further disassembly of air horn is not required for cleaning purposes. DO NOT remove choke valve, air valve or air valve shaft. Instructions for replacing the air valve closing spring and plastic cam are provided in service kit.
9. The air horn idle air bleed valve is preset and sealed at the factory. The idle air bleed valve should not be removed unless "System Performance Check" of Computer Command Control system indicates need for adjustment or repair.

Note. Air horn idle air bleed valve should be cleaned in low volatile cleaning solvent. DO NOT place air horn (with idle air bleed valve) in carburetor cleaner. Tamper-resistant plugs may be removed during carburetor service for on- vehicle final adjustment.

Air Bleed Valve

1. To replace idle air bleed valve or disassemble air horn for immersion in carburetor cleaner, cover internal bowl vents and air inlets to bleed valve with tape.
2. Drill rivet heads off bleed valve cover with a 7/64" drill. Drive remainder of rivet out of tower with drift and small hammer. Lift out cover and remove remaining pieces from inside tower.
3. Turn valve counterclockwise and remove from air horn. Remove and discard "O" ring seals from air bleed valve. Air bleed valve is serviced as a complete assembly.

Note. A missing air valve cover indicates that idle air bleed valve setting has been changed from original factory setting.

Float Bowl

1. Remove air horn gasket and discard gasket. Remove pump plunger and return spring from pump well. Remove solenoid attaching screw. Using Mixture Adjustment Wrench (J-28696-10), remove mixture control solenoid adjustment screw, solenoid plunger, and solenoid plunger rich limit stop as an assembly.
2. DO NOT remove plunger return spring or connector wires from solenoid bodies. The mixture control solenoid, plunger and connectors, are serviced as an assembly. Remove plastic insert from top of mixture control assembly. Carefully lift each metering rod out of its metering jet guide.
3. Ensure that return spring is removed with each rod. Remove and discard gasket from top of solenoid connector. Remove solenoid adjusting screw tension spring from float bowl, next to float hanger pin. Remove float assembly and float needle by pulling up on retaining pin.
4. Using Seat Remover (J-22769), remove needle, seat and gasket. Remove large mixture control solenoid tension spring from boss on bottom of float bowl, located between metering jets.
5. Remove staking holding TPS in bowl with a small screwdriver. Lightly depress and hold TPS down against spring tension. Carefully remove staking from around TPS by prying upward with a small chisel against the metal piece (not bowl casting).
6. Push up on electrical connector to remove TPS and connector assembly from bowl. Use care not to damage sensor. Remove spring from bottom of TPS well in float bowl. If necessary, remove primary main metering jets using Metering Jet Remover (J-28696-4). DO NOT damage metering rod guide upper areas. NOTE: Secondary jets are integral and if damaged, float bowl must be replaced.
7. On E4MED carburetor, use Accelerator By-pass Valve Wrench (J-34928) to remove accelerator by-pass valve gasket. Remove pump discharge ball retainer with bowl inverted to catch ball as it falls. Remove secondary air baffle, if replacement is required.
8. Remove hose from rear vacuum break assembly. Remove 2 attaching screws from float bowl. Remove rear vacuum break and bracket assembly. Rotate assembly to remove vacuum break link from slot in plunger.
9. Remove fuel inlet nut, gasket, filter assembly, and spring. Discard filter assembly and gasket. Remove 3 throttle body attaching screws and lock washers. Remove throttle body assembly with insulator gasket.

Choke Cover

1. Align a 5/32" drill on choke cover retaining rivets and remove rivet head. Using a drift and hammer, drive remainder of rivets out of choke housing. Remove 3 retainers and choke cover from choke housing. Remove retaining screw and washer from inside choke housing.
2. Slide choke housing away from float bowl. Remove secondary throttle valve lock-out lever from float bowl. Invert bowl and remove lower choke lever from inside bowl cavity. To disassemble choke shaft from choke housing, remove coil lever retaining screw from end of choke shaft.
3. Remove thermostatic coil lever from flats on choke shaft. Slide intermediate choke shaft out of choke housing. Remove fast idle cam from choke shaft. Remove cup seal from float bowl insert. DO NOT remove insert.

Idle Mixture Needle Plug Removal. Scheme 30

Exploded View of Rochester Model E4ME and E4MED 4-Barrel Carburetor. Scheme 31

Throttle Body

Remove accelerator pump link from throttle lever by rotating link until tang on link aligns with slot in lever. Further disassembly of throttle body is not required for normal cleaning. Throttle valve screws are permanently staked in position. Throttle body is serviced as complete assembly.

Idle Mixture Plug Removal

1. From carburetor base, make 2 parallel cuts in throttle body using a hacksaw. (Scheme 30) Cut each side of idle mixture plugs down to steel plug, but no more than 1/8" beyond locator points. Drive punch at 45° angle near ends of saw marks until casting breaks away and exposes steel plug.
2. Hold punch vertically and drive it into steel plug. Hold punch at 45° angle and drive plug out of casting. Repeat process for remaining mixture needle plug. When removing or installing needles, inspect for damage or wear. Refer to appropriate TUNE-UP article for final adjustment.

CLEANING & INSPECTION

1. Use a regular carburetor cleaning solution. Soak components long enough to thoroughly clean all surfaces and passages of foreign matter.
2. DO NOT soak any components containing rubber, leather or plastic. DO NOT soak air horn with idle air bleed valve, electric choke, ISS, ISC, TPS, thermostatic choke cover, vacuum break diaphragms or pump plunger installed.
3. Remove residue after cleaning by rinsing components in solvent.
4. Blow out all passages with dry compressed air.
5. If float bowl needs replacement, inspect for letters "MW" (next to fuel inlet) on casting. These letters indicate a machined pump well, and determine type of pump needed. Replacement float bowl also must have "MW" letters.

REASSEMBLY

Note. Always use new gaskets and seals. Verify all new gaskets fit correctly. Make sure all holes and slots are punched through and correctly located.

Reassemble carburetor in reverse order of disassembly.

1. The intermediate choke shaft lever and fast idle cam are assembled correctly when tang on lever is beneath fast idle cam. When installing float and retaining pin, make sure open end of float retaining pin faces accelerator pump well.
2. When installing fuel inlet valve, hook pull clip over edge of flat on float arm. DO NOT hook clip in holes to float arm. When installing mixture control solenoid, make sure pin on end of solenoid aligns with hole in raised boss at bottom of float bowl. After assembly perform mixture control solenoid travel adjustment. See «ADJUSTMENTS»(/gmc/cab-chassis-s15/1985-1988/remont/testing-diagnostics/#carburetor-rochester-e4me-e4med-4-bbl__adjustments) in this article.
3. When installing idle air bleed valve, lightly coat 2 new "O" ring seals with automatic transmission fluid. Thick seal goes in upper groove and thin seal goes on lower groove. Adjust air bleed valve. See «ADJUSTMENTS»(/gmc/cab-chassis-s15/1985-1988/remont/testing-diagnostics/#carburetor-rochester-e4me-e4med-4-bbl__adjustments) in this article.
4. If choke coil cover was removed, it will be necessary to install service rivet retaining kit. Before installing cover, place fast idle screw on high step of fast idle cam. Align notch in cover with raised boss on housing cover flange and install rivets.
5. Place fast idle screw on high step of fast idle cam. Install choke coil cover, aligning notch in cover with tab on cover retainer (supplied in service kit). Be sure coil tang engages pick-up lever. Install blind rivets. NOTE: Choke cover gasket must not interfere with ground contact provided by metal plate at rear of cover assembly.
6. Install air horn screws and tighten evenly, securely and in sequence shown. (Scheme 32)

Air Horn Screw Tightening Sequence. Scheme 32

SPECIFICATIONS

CARBURETOR ADJUSTMENT SPECIFICATIONS

See also:
• TESTING
• ADJUSTMENTS