Difficult Or No Start: Carbureted

Check battery condition.
Ensure sufficient secondary spark is available.
Ensure engine has sufficient compression.
Ensure ignition and valve timing are correct.
Verify choke valve is closed (engine cold).
Verify choke valve is open (engine hot).
Ensure fuel level is at specified mark on carburetor sight glass.
Ensure fuel system pressure and volume are correct.
Check for correct vacuum hose routing.
Check slow fuel-cut solenoid valve operation. A click should be heard from solenoid valve as ignition is cycled on and off.
Check charcoal canister operation by clamping hose(s) shut. If problem discontinues, check vacuum hose routing. If routing is correct, replace charcoal canister.
Ensure winter grade fuel is not being used in warm climate conditions.
Ensure exhaust system is not restricted.
Ensure that ECU is properly grounded.