Ariens 306cc Series User Manual download pdf (Page 9)

Noisy Engine Excessive Valve Chatter

1. Too large valve clearance Adjust

2. Weakened or broken valve spring Replace

3. Worn tappet or cam lobe Replace

4. Worn and burnt camshaft journal Replace

Noise seems to come from piston

1. Worn down piston or cylinder Replace

2. Fouled with carbon combustion chamber Clean

3. Worn piston pin or piston pin bore Replace

4. Worn piston rings or ring grooves Replace

Noise seems to come from crankshaft

1. Rattling bearings due to wear Replace

2. Worn and burnt main bearings Replace

3. Worn and burnt pin bearing Replace

4. Too large endplay Adjust

Noise seems to come from outside of engine

1. Loose trim item Tighten

Engine runs poorly in high

speed range

Defective engine internal/electrical parts

1. Weakened valve springs Replace

2. Worn camshaft Replace

3. Valve timing out of adjustment Adjust

4. Too narrow spark plug gaps Adjust

5. Defective ignition coil Replace

6. Clogged air cleaner element Replace

7. Clogged fuel line, resulting in inadequate fuel supply

to carburetor

Replace

8. Worn bearings Replace

9. Blown head gasket Replace

10. Ignition coil air gap too wide Adjust

11. Dirty/gummed up carburetor Clean

12. Stale fuel Replace

Defective air ﬂ ow system

1. Carburetor gasket leak - sucking air causing engine to

run lean

Replace

Engine lacks power Defective engine internal/electrical parts

1. Loss of valve clearance Adjust

2. Weakened valve springs Replace

3. Out of adjustment valve timing Adjust

4. Worn piston ring or cylinder Replace

5. Poor seating of valves Replace

6. Fouled spark plug Replace

7. Incorrect spark plug Replace

8. Clogged air ﬁ lter element Replace

9. Carburetor gasket leak - sucking air causing engine to

run lean

Replace

10. Too much engine oil Adjust

11. Air ﬁ ns clogged on engine causing to overheat Remove debris

12. Not enough oil in engine Adjust

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Ariens 306cc Series User Manual Page 9

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