About the 400EX Engine
The 400EX engine is a powerful and popular choice for off-road enthusiasts. Manufactured by Honda, this engine is known for its reliability and performance. It is a four-stroke, single-cylinder engine with a displacement of 397cc. The 400EX engine features a high compression ratio, allowing it to deliver impressive power and torque. Whether you’re tackling rough terrains or participating in competitive racing, the 400EX engine is designed to provide a thrilling riding experience.
400EX Head Bolt Torque Specs
When working on the 400EX engine, it is crucial to ensure that the head bolts are tightened to the correct torque specifications. This helps maintain the integrity of the engine and prevents any potential issues. Here are the recommended head bolt torque specs for the 400EX engine:
| Head Bolt | Torque Specs (ft. lbs.) | Torque Specs (Nm) |
|---|---|---|
| 1 | 16 | 22 |
| 2 | 16 | 22 |
| 3 | 16 | 22 |
| 4 | 16 | 22 |
| 5 | 16 | 22 |
| 6 | 16 | 22 |
| 7 | 16 | 22 |
| 8 | 16 | 22 |
Steps to Torque the Head Bolts
To properly torque the head bolts on your 400EX engine, follow these steps:
1. Start by cleaning the head bolt threads and the corresponding holes in the engine block. This ensures a clean and accurate torque reading.
2. Apply a small amount of engine oil or assembly lubricant to the threads of each head bolt. This helps reduce friction and ensures proper torque values.
3. Begin tightening the head bolts in a crisscross pattern. Start with bolt number 1, then move to bolt number 2, and so on. This pattern helps distribute the torque evenly across the cylinder head.
4. Use a torque wrench to tighten each head bolt to the specified torque value. Gradually increase the torque in multiple stages, following the recommended sequence.
5. Once all the head bolts have been torqued to the specified value, double-check each bolt to ensure they are properly tightened.
By following these steps and using the recommended torque specifications, you can ensure that the head bolts on your 400EX engine are properly tightened, providing a secure and reliable seal.
Conclusion
The 400EX engine is a powerful and reliable choice for off-road enthusiasts. When working on the engine, it is important to torque the head bolts to the correct specifications to maintain its integrity. By following the recommended torque values and using a proper torque wrench, you can ensure that the head bolts are tightened properly, allowing the engine to perform at its best.