4-17. CARBURETOR ADJUSTMENT.
This task covers:
Tool Kit, General Mechanic's: Automotive
TM or Para
Air cleaner removed.
Fuel is very flammable and can explode easily. To avoid serious injury or death:
Keep fuel away from open flame or any spark (ignition source).
Keep at least a B-C fire extinguisher within easy reach when working with fuel or on a fuel system.
Do not work on fuel system when engine is hot; fuel can be ignited by a hot engine.
Clean fuel tank to purge any flammable liquid or vapors before welding, grinding, or using any heat
producing device near the fuel tank.
Post signs that read: "NO SMOKING WITHIN SO FEET OF VEHICLES" when working with open
fuel, fuel lines or fuel tanks.
Do not overtighten needles marked L or
H, damage will result.
(1) Turn needle marked L (1) CW (inward)
until it is fully seated. This is the idle fuel
(2) Turn needle marked H (2) CW (inward)
until it is fully seated. This is the high speed
(3) Open needle L (1) l/2 turn (CCW). Open
needle H (2) one full turn (CCW).
(4) Start engine (para 2-9). Allow to warm up. Run engine at idle. Turn needle L (1) CW (inward) until engine
slows. Open needle L l/4 to l/2 turn for smooth operation.