Specifications

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C. ENGINE MISSES UNDER LOAD
Cause Remedy
Spark plug fouled. Clean and regap spark plug.
Spark plug porcelain cracked. Replace spark plug.
Improper spark plug gap. Regap spark plug.
Pitted magneto breaker points. Clean and dress breaker points. Replace badly
pitted breaker points.
Magneto breaker arm sluggish. Clean and lubricate breaker point rod and arm.
Check for spring tension.
Faulty condenser. Check condenser on a tester; replace if defective.
Improper carburetor adjustment. Adjust carburetor.
Improper valve clearance. Adjust valve clearance.
Weak valve spring. Replace valve spring.
D. ENGINE LACKS POWER
Choke partially closed. Open choke.
Improper carburetor adjustment. Adjust carburetor.
Magneto improperly timed. Time engine.
Loss of compression. Check compression.
Lack of lubrication. Fill crankcase to the proper level.
Air cleaner restricted. Clean or replace air cleaner.
Valves leaking. Grind valves.
Valve timing inaccurate. Check timing marks on camshaft and crankshaft
gear.
Carburetor dirty or damaged. Clean, repair carburetor. See Carburetor Chapter 2.
Ignition system malfunction. Check and repair system.
E. ENGINE OVERHEATS
Engine improperly timed. Time engine.
Carburetor improperly adjusted (lean). Adjust carburetor.
Air flow obstructed. Remove any obstructions from air passages in shrouds.
Excessive load on engine. Check operation of associated equipment.
Reduce excessive load.
Carbon in combustion chamber. Remove cylinder head and clean carbon from head
and piston.
Lack of lubrication. Fill crankcase to proper level.
F. ENGINE SURGES OR RUNS UNEVENLY.
Fuel tank cap vent hole clogged. Open vent hole.
Governor parts sticking or binding. Clean, and if necessary repair governor parts.
Carburetor throttle linkage or throttle shaft Clean, lubricate, or adjust linkage and deburr throttle
and/or butterfly binding or sticking. shaft or butterfly.