Harley-Davidson FLS/FXS Twin Cam 88B, 95B, 103B Repair Manual 2000-2005

• Harley FLSTC/FLSTCI Heritage Softail Classic 2000-2005
• Harley FLSTF/FLSTFI Fat Boy 2000-2005
• Harley FLSTFI Fat Boy 15th Anniversary Edition 2005
• Harley FLSTFSE Screamin' Eagle Fat Boy 2005
• Harley FLSTS/FLSTSI Heritage Springer 2000-2004
• Harley FLSTN/FLSTNI Softail Deluxe 2005
• Harley FLSTSC/FLSTSCI Softail Springer Classic 2005
• Harley FXST/FXSTI Softail Standard 2000-2005
• Harley FXSTB/FXSTBI Night Train 2000-2005
• Harley FXSTS/FXSTSI Springer Softail 2000-2005
• Harley FXSTD/FXSTDI Softail Deuce 2000-2005
• Harley FXSTDSE2 Screamin' Eagle Deuce 2004

Spark plugs are available in various heat ranges that are hotter or colder than the plugs originally installed by the manufacturer.

Select a plug with a heat range designed for the loads and conditions under which the motorcycle will be operated. A plug with an incorrect heat range can foul, overheat and cause piston damage.

In general, use a hot plug for low speeds and low temperatures. Use a cold plug for high speeds, high engine loads and high temperature.

The plug should operate hot enough to burn off unwanted deposits, but not so hot that it is damaged or causes preignition. To determine if plug heat range is correct, remove each spark plug and examine the insulator.

Do not change the spark plug heat range to compensate for adverse engine or air/fuel conditions.

When replacing plugs, make sure the reach or thread length (B,Figure 69) is correct. A longer than standard plug could interfere with the piston and cause engine damage.

Refer to Table 8 for recommended spark plugs.

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