Does Not Start - Warm

Check battery condition.
Ensure sufficient secondary spark is available.
Ensure ignition and valve timing are correct.
Verify choke valve is open.
Ensure fuel level is at specified mark on carburetor sight glass.
Ensure fuel system pressure is correct.
Check for contaminated fuel.
Check for clogged fuel return hose.
Check for loose or clogged carburetor jets.
Check for fuel percolation.
Ensure correct vacuum hose routing.
Check float chamber vent solenoid operation.
Check slow fuel-cut solenoid valve operation. A click should heard from solenoid valve as ignition switch is cycled on and off.
Check charcoal canister operation by clamping hose(s) shut. If problem stops, check vacuum hose routing.
Ensure exhaust system is not restricted.