Yamaha Kodiak 450 Spark Plugs

Yamaha Kodiak 450 spark plugs are a device that fit into the cylinder head of an internal combustion engine. It is an electronic part that delivers an electric current from the ignition system to the combustion chamber.

The Yamaha Kodiak 450 is a liquid-cooled 4-stroke engine with a forward-inclined single cylinder arrangement. It has a 421 cm3  displacement with a bore x stroke of 84.5 x 75.0 mm (3.33 x 2.95 in) and a 10 : 1 compression ratio.

Spark Plug Specifications

The spark plug specifications listed are cited from the Yamaha Kodiak 450 factory service manual LIT-11616-KD-46.

• Spark plug qty: 1
• Spark plug type: DR8EA
• Spark plug brand: NGK
• Spark plug gap: 0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
• Spark plug torque spec: 7 Nm (5.1 ft·lb) or 0.7 m·kg.

Spark Plug Maintenance

Spark plugs play an important role in starting the Yamaha Kodiak engine. Spark plug maintenance is very important too. The process of keeping spark plugs in good condition is hardly time-consuming.

You should check the spark plug condition, clean it, adjust the plug gap and replace it if necessary. Periodic maintenance should be performed every 75 hours of use or every 750 miles (1,200 km) whichever comes first.

Spark Plug Service

1. Remove:
   • Take off ATV seat.
   • Remove right fuel tank side panel.

     

2. Remove:
   • Take out spark plug.
3. Check:
   • Check spark plug type (DR8EA/NGK), if incorrect, replace.
   • Be certain the spark plug electrode (1) is not worn or damaged, replace if necessary.
     
   • Check spark plug insulator (2). It should be medium-to-light tan in color, if not, replace plug.
4. Clean:
   • Clean spark plug with a wire brush or spark plug cleaner.
5. Measure:
   • Use a feeler gauge or spark plug wire gauge to measure gap.
     
   • Regap if out of spec 0.6 ~ 0.7 mm (0.024 ~ 0.028 in).
6. Tighten:
   • Clean gasket hole before re-inserting spark plug.
   • Position the spark plug back into plug hole.
   • Finger tighten spark plug before you torque it with a wrench.
   • Torque plug 7 Nm (5.1 ft·lb) or 0.7 m·kg.
7. Install:
   • Put right side fuel tank side panel back on.
   • Fix the seat back into position.

Spark Plug Troubleshooting

This troubleshooting guide will help you trace and correct faults that relate to the spark plug. If the utility all-terrain vehicle is hard to start or fails to start, check the following.

HARD STARTING/STARTING FAILURE
Spark plug improperly gapped Worn spark plug electrodes Wire between spark plug terminals broken Incorrect spark plug heat range Spark plug cap faulty Spark plug lead faulty loose spark plug	Regap plug Replace spark plug Replace spark plug wire Replace with DR8EA/NGK Replace spark plug cap Repair Tighten

Spark Plug Model & Year Application

Spark plug information applies to the following Yamaha Kodiak 450 models.

Year	Model Name	Marketing Name
2005	YFM45FSET	Kodiak 450 4WD SE
2005	YFM45FAT	Kodiak 450 4WD
2005	YFM45FAHT	Kodiak 450 4WD Hunter
2006	YFM45FABGGV	Kodiak 450 Outdoorsman Edition Hunter Green
2006	YFM45FABGHV	Kodiak 450 Outdoorsman Edition Camo
2006	YFM45FAHV	Kodiak 450 4WD Hunter
2006	YFM45FASEV	Kodiak 450 4WD Special Edition
2006	YFM45FAV	Kodiak 450 4WD