Ariens 306cc Series User Manual download pdf (Page 10)

Dirty or heavy exhaust smoke 1. Too much engine oil in the engine Adjust

2. Worn piston rings or cylinder Replace

3. Worn valve guides Replace

4. Scored or scuffed cylinder wall Replace

5. Worn valve stems Replace

6. Defective stem seal Replace

7. Worn oil ring side rails Replace

No spark or poor spark 1. Defective ignition coil Replace

2. Defective spark plug Replace

3. Open-circuit wiring connection Check and repair

Spark plug fouled with carbon 1. Incorrect gasoline Replace

2. Dirty air cleaner element Replace

3. Too cold spark plug Use hotter plug

Spark plug becomes fouled

too soon

1. Worn piston rings Replace

2. Worn piston or cylinder Replace

3. Excessive clearance of valve stems in valve guides Replace

4. Worn valve stem oil seal Replace

Spark plug electrode over-

heated or burnt

1. Too hot spark plug Use colder plug

2. Overheated the engine Tune up

3. Loose spark plug Tighten

4. Too lean fuel mixture Check for air leak

Spark Plug Service

Recommended spark plugs: Torch Plug: F6RTC

Cross References

• Champing plug cross reference is: RN9YC (some tables show RN9YCC)

• NGK plug cross reference is: BPR6ES

• BOSCH plug cross reference is: WR6DC

• NOTICE

Using an incorrect spark plug may cause engine damage.

1. When engine is cool, disconnect the spark plug cap and remove any debris from the spark plug area with high pressure air.

2. Remove the spark plug with a 13/16-inch spark plug wrench.

3. Inspect the spark plug. Replace it if the electrodes are worn or if the insulator is cracked or chipped. Spark plug gap should

be set to 0.027 - 0.030 inches.

4. Install the spark plug carefully to avoid cross threading. Screw in spark plug by hand until it stops turning.

5. Tighten the spark plug with a 13/16-inch spark plug wrench. Tighten 1/4 turn after the spark plug seats.

• NOTICE

A loose spark plug can overheat and damage the engine. Over-tightening the spark plug can damage the threads in the

cylinder head.

6. Attach the spark plug cap. Ensure spark plug cap snaps into place securely.

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Ariens 306cc Series User Manual Page 10