Compatibility: Compatible with 9.9 engines from 1985 to 2006; For F9.9 from 1998 to 2008; For F13.5A from 2005 to 2007. Material: The motorcycle starter relay is made of materials to ensure long term use, improving practicality and operating efficiency while delivering reliable and stable performance. Benefits and performance: Provides a strong starting current under adverse conditions, enabling quick and stable starts every time. Easy to install: Simplified installation with no modification, cutting, or drilling required. Just the old or damaged parts and plug in directly. Use scenarios: Scenario 1: Replacing a worn or failing relay on 9.9 and F9.9 engines to restore reliable starts during boating trips or on cold mornings. Scenario 2: Serving as a dependable replacement for F13.5A engines (2005–2007) during weekend fishing or camping trips where fast, reliable starts are essential. Scenario 3: Emergency backup on remote locations where quick swap in without tools or alterations keeps the engine ready to start.