Jensen 541 - Engine; Engine Misfires; Engine Starts and Stops; Engine Runs on Wide Throttle Only

ENGINE IGNITION
MISFIRES.
-High tension leads to spark
plugs shorting.
-Incorrect spacing of sparlc
plug points.
-Cracked sparlc plug porcelain.
-Battery Connection loose.
-- Faulty or damp cap.
ENGINE STARTS
AND STOPS.
IGNITION
CARBURETTER
Water in Carburetter.
-Petrol line partly cholted.
-Fuel pump pressure low.
-Fuel pump filter cholted.
-Needle valve faulty or dirty.
LOW tension connection loose.
-Faulty switch contact.
-Dirty contact points.
MECHANICAL
-Valves sticking.
Valves burnt or
broken.
-Valve spring broken
Incorrect valve
clearance.
__ I -
I
CARBURETTOR.
-Petrol line blocked.
-Water in petrol.
---Needle valve sticlting.
-Fuel pump faulty.
--Petrol exhausted.
--Air
lealts.
ENGINE RUNS ON WIDE
THROTTLE ONLY.
I
CARBURETTER
MECHANICAL.
1
-Slow running adjusting screw
--Valve sticking.
incorrectly adjusted.
IZvalve burnt or broken.
Valve spring broken.
--P---------------
MECHANICAL and IGNITION
ENGINE DOES NOT GIVE CARBURETTER
FULL POWER.
-Ignition retarded.
--Timing too far advanced.
--Excessive carbon deposit.
C Loose bearing or pistons.
2
I---
+
;<
-- High tension lead shorting.
--Valve burnt or bad seating.
--Incorrect valve clearance.
--Plug leads crossed.
--
Faulty cap.
--Petrol supply faulty.
. .. -
-Petrol feed faulty.
--Inlet valve not closing.
-Ignition timing incorrect.
-Carburetter flooding.
ENGINE RUNS
-I IMPERFECTLY. ,-Weak mixture. ENGINE KNOCKS.
9
-Air leaks in induction pipe.
-Jet partly choked.