Vapor lock is a common issue with Harley-Davidson Sportster 1200 motorcycles, particularly older models. It occurs when the fuel in the carburetor or fuel injection system vaporizes and creates air bubbles. These bubbles prevent fuel from reaching the engine, causing it to stall or run erratically. Vapor lock is more likely to occur in hot weather, when the fuel is more volatile.
2. Fuel Pump Issues
The fuel pump is responsible for delivering fuel from the fuel tank to the engine. If the fuel pump is faulty, it may not be able to provide enough fuel to the engine, causing it to stall or run erratically. Fuel pump issues are more likely to occur in older Sportster 1200 models.
3. Clogged Fuel Filter
The fuel filter is responsible for removing impurities from the fuel. If the fuel filter is clogged, it can restrict fuel flow to the engine, causing it to stall or run erratically. Clogged fuel filters are more likely to occur in older Sportster 1200 models.
4. Dirty Spark Plugs
Spark plugs are responsible for igniting the fuel in the engine. If the spark plugs are dirty or worn, they may not be able to produce a strong enough spark, causing the engine to misfire or stall. Dirty spark plugs are more likely to occur in older Sportster 1200 models.
5. Faulty Ignition Module
The ignition module is responsible for controlling the spark timing in the engine. If the ignition module is faulty, it can cause the engine to misfire or stall. Faulty ignition modules are more likely to occur in older Sportster 1200 models.
