Service Manual

3-36
Table of Contents
Twin Cylinder Engine Service Manual
February 2017 - Digital Edition
TWO BARREL CARBURETOR AND FUEL SYSTEM
Carburetor Testing
Pop Off Test
1. With carburetor removed, position with float bowl up.
2. Using a hand pressure tester, apply pressure to the fuel inlet.
NOTE: Follow tester instructions.
3. While pumping, observe the pressure increase.
4. Stop pumping, observe the pressure drop slightly, then stabilize as the float weight closes the needle and holds
pressure. The pressure should not drop to zero.
NOTE: An exact pressure value isn’t required to measure the integrity of the float and needle to hold
pressure.
5. If pressure drops, evaluate needle tip and seat condition. Replace needle or carburetor as needed.
Fuel Solenoid Test
1. Remove fuel shut-off solenoid from the carburetor.
2. Hold the solenoid vertically, with the solenoid valve pointing up, to keep the solenoid valve and spring from
falling out.
NOTE: Refer to section 3, page 34 for proper assembly.
3. Apply 12V DC power and ground to the solenoid leads. The solenoid valve should retract inside the solenoid
body.
NOTE: The solenoid should make an audible “click” when the key switch is turned on.
4. Remove the voltage and the spring should push the solenoid valve back out.
5. Replace assembly if test fails as the solenoid is not serviceable.