Can a vacuum leak cause a motorcycle to stall?
If you run into a situation like this, I would recommend replacing the felt with an O-ring. Fuel pump diaphragm and/or tubing leading to intake can also be a source for a leak. The fuel pump diaphragm can also leak fuel through vacuum tubing causing the motor to stall on deceleration.
Can a Honda CB750 have a vacuum leak?
• Do not mistake vacuum leaks for out of synch carbs. Never attempt to synch carbs without verifying that there are no vacuum leaks. The video below takes you for a test ride on an 81’ Honda CB750 with severe vacuum leaks in the carb holders and throttle shafts.
What causes carburetor to pop on Harley Davidson?
The gaskets between the head pipes and the exhaust ports of the heads is a crush fit that will leak if the pipes are removed, reinstalled, or over/under torqued. Cool air drawn into the exhaust at these seals will result in hesitation or popping commonly misdiagnosed as a carburetor problem.
How do you test for a vacuum leak on a Harley Davidson?
The boot seal must be replaced periodically. To test for a vacuum leak, use a propane torch (unlit) and wave the gas around the manifold area while the engine idles. If there is a vacuum leak the gas will be drawn into the leak and cause the engine RPM to slow or fluctuate.
What happens if you Flood a vintage Honda?
Flooding is a common problem in vintage Hondas – especially on bikes that don’t get run much. Flooding can be just a minor aggravation …like hard starting or poor fuel mileage. But, it can also lead to catastrophic problems such as severe engine damage or even a fire!
Why does my Honda engine keep flooding with oil?
Excess fuel overflows and spills into the central plenum then disappears (usually) into the engine …washing down the protective oil film on the cylinders then diluting the oil in the oil pan! This makes tracing the actual source of the flooding more difficult.
What happens to the float needle on a Honda?
Likewise, when the float falls, the float needle opens the fuel inlet and allows fuel to flow into the bowl. In actual operation, the float needle oscillates through a relatively small range of motion.
If you run into a situation like this, I would recommend replacing the felt with an O-ring. Fuel pump diaphragm and/or tubing leading to intake can also be a source for a leak. The fuel pump diaphragm can also leak fuel through vacuum tubing causing the motor to stall on deceleration.
• Do not mistake vacuum leaks for out of synch carbs. Never attempt to synch carbs without verifying that there are no vacuum leaks. The video below takes you for a test ride on an 81’ Honda CB750 with severe vacuum leaks in the carb holders and throttle shafts.
Can a vacuum leak cause a fuel pump to leak?
Fuel pump diaphragm and/or tubing leading to intake can also be a source for a leak. The fuel pump diaphragm can also leak fuel through vacuum tubing causing the motor to stall on deceleration. The video below will show you how to check a fuel pump diaphragm.