Troubleshooting

Stromberg 97 carburetors can experience flooding due to several possible causes. Here are some common factors that can contribute to flooding in Stromberg 97 carburetors:

1. Incorrect fuel level: If the fuel level inside the carburetor bowl is set too high, it can lead to excessive fuel entering the engine, resulting in flooding. This can happen due to a misadjusted float or a faulty needle and seat assembly.

2. Stuck float: The float in the carburetor is responsible for regulating the fuel level. If the float becomes stuck in the open position, it won't be able to control the fuel flow properly, leading to flooding.

3. Worn or damaged needle and seat, or float valve: The needle and seat assembly regulate the flow of fuel into the carburetor bowl. Over time, these components can wear out or become damaged, causing fuel to continuously flow into the bowl and leading to flooding. This is the #1 cause of flooding. Needles can be damaged by putting pressure on them while adjusting the float. Look for score lines on the viton tip.

4. High fuel pressure: If the fuel pressure from the fuel pump is too high, it can overwhelm the carburetor's ability to regulate the fuel flow, leading to flooding.

5. Ventilation issues: Proper ventilation is crucial for the carburetor to function correctly. If the vents or breather tubes are blocked or restricted, it can disrupt the air-to-fuel ratio and cause flooding.

To address flooding issues in Stromberg 97 carburetors, it is essential to inspect and clean the carburetor, ensure proper adjustment of the float and fuel level, and replace any worn or faulty components as necessary. Regular maintenance and proper tuning can help prevent flooding problems.

Several factors can contribute to a Stromberg 97 carburetor being hard to start. Here are some common causes:

1. Fuel system issues: Problems within the fuel system can make starting difficult. Insufficient fuel pressure, a clogged fuel filter, or a faulty fuel pump can result in inadequate fuel supply to the carburetor, making it hard to start the engine.

2. Ignition system problems: If the ignition system is faulty, it can lead to difficulties in starting the engine. Issues such as worn spark plugs, a weak ignition coil, or a malfunctioning distributor can prevent proper ignition and cause starting problems.

3. Choke malfunctions: The choke mechanism on the carburetor helps provide the engine with a rich fuel mixture during cold starts. If the choke is not functioning correctly or is misadjusted, it can make starting the engine more challenging.

4. Incorrect carburetor adjustment: Improper carburetor settings, such as an incorrect idle mixture or idle speed, can make it difficult to start the engine. A lean fuel mixture or excessively high idle speed can hinder the starting process.

5. Vacuum leaks: Vacuum leaks in the intake manifold or carburetor gaskets can disrupt the air-fuel mixture and make starting the engine harder. Unmetered air entering the system can lead to a lean fuel mixture, causing starting difficulties.

6. Engine mechanical issues: Problems within the engine itself, such as low compression, worn piston rings, or a malfunctioning valve train, can make starting more challenging. These issues can affect the engine's ability to draw in and ignite the fuel-air mixture properly.

To address hard starting issues with a Stromberg 97 carburetor, it is recommended to check the fuel system and ignition system for any problems or malfunctions. Ensure that the choke is functioning correctly and adjust the carburetor settings properly. Additionally, inspect for any vacuum leaks and address any engine mechanical issues that may be contributing to the problem. Regular maintenance, including spark plug replacement and fuel system cleaning, can also help improve starting performance.

Hard Starting When Hot

• After running the engine and warmed up, turn off and look down the carburetor to see if gas is dribbling from the venturi. If so, then the discharge check ball may be leaking, or a non vented gas cap is being used, or perhaps the fuel bowl vent is plugged off.
• After turning off a hot engine and you smell gas then the carburetor may be boiling the gas, causing it to evaporate, thus making it hard to start.