1. The carburetor is bolted to the intake manifold with four nuts. Over time, nuts can loosen from vibration and temperature changes, causing vacuum to leak.
2. If you suspect a vacuum leak, pick up a piece of hose that is approximately the same diameter as the fuel supply hose. Start the engine, hold the end of the hose to your ear, and run the other horse around the base of the carburetor. If a leak exists. You will hear a hissing sound.
3. Remove the air filter assembly, marking each hose to be separated to facilitate subsequent installation.
4. Install the mounting nuts into the carburetor base and tighten them securely. The manufacturer does not indicate the exact value of the tightening torque for these nuts.
5. Tighten nuts securely and evenly. Do not drag them, because the thread may break.
6. If, after the nuts are properly tightened, a vacuum leak still exists, remove the carburetor and replace its gasket - see Section 4.
7. Install the air filter and connect all hoses.