Attention! The described adjustments are made on the engine. The adjustment procedure when assembling the carburetor is indicated in the instructions that came with the repair kit.
Air damper diaphragm adjustment
1. Start the engine.
2. At idle, disconnect the vacuum hose between the carburetor and the vacuum distributor (1 - move here, 2 - vacuum distributor, 3 - air damper diaphragm).
3. The air damper diaphragm rod should quickly return to its original position under the action of the spring.
4. After connecting the hose, the rod should retract within 5-15 seconds (1 - attach at this location).
Air damper diaphragm adjustment
1. Start the engine when the coolant temperature is not higher than 5°C.
2. Disconnect and reattach the hose at the diaphragm.
3. Make sure the diaphragm rod stays still.
4. After warming up the engine, disconnect the hose on the diaphragm, the diaphragm rod should return to its previous position (the arrow indicates the point of attachment).
5. Connect the hose, - while the damper should open slightly under the action of vacuum in the diaphragm.
Choke Cable Adjustment
1. Remove the air filter and fully pull out the choke cable handle until the choke is fully closed.
2. Slide the handle away from you - the damper should open completely.
Fast idle adjustment
1. Warm up the engine to normal operating temperature, switch off the ignition and remove the air filter.
2. Completely close the air damper.
3. Disconnect the vacuum hoses from the ignition distributor and muffle.
4. Disconnect the vacuum hoses from port S of the vacuum control valve and plug.
5. Connect a tachometer and set the fast idle speed to 1800 rpm (rotation adjustment screw).
6. Open the choke, the idle speed should drop to normal.
Adjusting the quality of the mixture at idle
Attention! Check the ignition setting, the condition of the distributor cap and runner, spark plugs and high-voltage wires. Make all adjustments. As a rule, a violation of the normal composition of the mixture is associated with air leakage.
1. Warm up the engine and remove the air filter.
2. Loosen the idle speed screw until the engine starts to run rough (throttle valve must be fully closed).
3. Tighten the mixture adjustment screw until the engine speed drops noticeably, then back off the screw until the engine speed increases to maximum.
Attention! If, before adjusting the quality of the mixture, in order to maintain the operation of the engine, it was necessary not to turn out, but to tighten the idle speed adjustment screw, then check the idle speed and repeat the mixture quality adjustment. This ensures that the mixture composition is set at full throttle.