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4A Cylinder Head
Trouble shooting and Remedies Fuel System
IMPORTANT! Always take the risk of fire into considera-
tion and therefore always keep a fire extinguisher near by!
Causes Action to be taken
Empty tank ............................. X X Fill the tank!
Closed fuel cock..................... X X Open the fuel cock!
Clogged fuel filter ................... X X X X Clean the filter or replace the filter insert
Fuel pump not pumping .......... X X X X X Fuel pump diaphragm cracked. Replace it.
Fuel line blocked .................... X X X X Blow all lines clean
Carburetor overflowing ............ X X X Needle valve not closing. Float level wrong. Leaking float.
Adjust the level or replace the float.
Wrong idling setting ................ X X X X Adjust the idle accord. to “Technical Data”.
Wrong setting air screw .......... X X X X Set the screw and adjust till smooth running obtained
Clogged jets ........................... X X X Blow the jets. Never try to use hard objects in the jet holes.
Carburetor sucking additional air X X X X Tighten the carburetor and if necessary replace the gasket.
Check the throttle shaft clearance.
Intake manifold loose ............. X X X X Tighten the manifold and replace the gasket.
Acceleration jet clogged ......... X Blow the jet clean.
Throttle does not open............ X X Adjust the throttle linkage
Wrong jet ................................ X X X Check the marking in “Technical Data”
Bad compression ................... X X X Take a compression test and then act according to results
Worn spark plugs ................... Change the spark plugs. See under “Technical Data”.
Wrong breaker points ............. Replace the breaker points and adjust dwell angle
Starting carburetor does not
work properly .......................... X X X Arm to be in closed position when the engine is hot
Wrong ignition setting ............. X X X Check setting with stroboscope and adjust if necessary
Toothed belt not installed
properly .................................. X X Check that the marking on the belt and gear wheel line up.
Adjust immediately!
Faulty acceleration pump ....... X X With engine stopped. Check by opening up the throttle and see if
fuel is spraying into the carburetor.
Symptoms
Difficult to start, cold engine
Difficult to start, hot engine
Starts but stops again
Runs rough at idle
Runs rough, the speed drops
Weak acceleration
Poor fuel economy
Backfires
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