09/08/2008
When delving into the world of ATV performance, particularly for the popular Suzuki LTZ400, one of the fundamental components that often sparks curiosity is the crankshaft. Many riders ponder whether their LTZ400 comes equipped with a crank as standard, and what options are available for enhancing its performance. This article aims to shed light on the LTZ400's crankshaft and explore the exciting possibilities offered by reputable performance specialists like CT Racing.
The LTZ400's Standard Crankshaft
Yes, the Suzuki LTZ400, like virtually all internal combustion engine vehicles, comes equipped with a crankshaft as a core component. The crankshaft is the heart of the engine's rotational power, converting the linear motion of the pistons into rotational motion that ultimately drives the wheels. It's a robust and precisely engineered part designed to withstand the considerable forces generated during combustion. For standard trail riding and recreational use, the stock LTZ400 crankshaft is generally reliable and sufficient.
When Performance Demands More: The Role of Upgraded Cranks
However, for those venturing into more demanding disciplines such as motocross, competitive off-road racing, or simply seeking a significant power increase, the stock crankshaft might become a limiting factor. This is where performance upgrades come into play. When you talk about 'big bore' kits, such as the 440 or 453 kits developed by CT Racing for the LTZ400 and its 'big brother' the RMZ450, these often involve increasing the engine's displacement. This inherently places greater stress on the crankshaft.
CT Racing's Expertise and LTZ400 Packages
CT Racing, a name synonymous with high-performance engine work, has extensive experience in developing and servicing engine components for top-tier motocross racers. Their work on the RMZ450, a motorcycle sharing significant engineering DNA with the LTZ400, translates directly into benefits for LTZ400 owners. They have honed their skills through collaboration with factory teams and professional riders, ensuring their performance packages are both potent and reliable.
The knowledge gained from these high-level operations is now available in a package designed specifically for your Suzuki LTZ400. These packages are engineered to deliver impressive performance gains, making your LTZ400 equally adept at tackling sand dunes, fast off-road trails, and demanding MX tracks.
Understanding Big Bore Kits
CT Racing offers a compelling 440 big bore motor package. This kit is meticulously designed to enhance the LTZ400's power output while maintaining a high degree of usability. For this kit to perform optimally and reliably, it's crucial to note that it requires a National caliber exhaust system and appropriate rejetting. CT Racing provides specific jet kits to ensure your carburettor is perfectly tuned for the increased displacement, ensuring a smooth and powerful delivery of power.
The 440 kit is specifically contoured for running on pump gas, offering a convenient and accessible performance upgrade. This means you don't necessarily need to source specialised fuels to enjoy the benefits of this particular big bore package.
The 453 Kit: Unleashing Beastly Power
For riders seeking an even more aggressive power increase, the 453 Kit is described as a 'Beast.' This kit is competitive with factory-built 450cc machines, especially when paired with an FCR carburetor. The typical power output for the 453 kit hovers in the mid-50s for horsepower. However, this significant leap in performance comes with specific requirements. The 453 kit, with its larger valves and high compression ratio, demands a minimum of 100 octane fuel.
To achieve this octane rating, you can blend your fuel by mixing 108-112 octane race gas with standard super unleaded pump fuel in a 50/50 ratio. This ensures the engine operates safely and efficiently, preventing detonation and maximising the power potential of this formidable kit.
Key Considerations for Crankshaft Upgrades
When considering a big bore kit or any modification that significantly increases engine power, it's essential to understand the implications for the crankshaft and other internal components:
| Modification | Potential Impact on Crankshaft | Required Fuel Octane | Supporting Modifications |
|---|---|---|---|
| Stock LTZ400 | Designed for standard operation | Regular Unleaded | None |
| CT Racing 440 Big Bore Kit | Increased stress due to larger displacement | Super Unleaded (Pump Gas) | National caliber exhaust, jet kit |
| CT Racing 453 Big Bore Kit | Significantly increased stress, potential need for stronger crank | Minimum 100 Octane (blendable) | National caliber exhaust, FCR carb, potentially upgraded crank |
Frequently Asked Questions
Q1: Does the LTZ400 come with a crankshaft from the factory?
Yes, every LTZ400 is equipped with a crankshaft as a fundamental part of its engine.
Q2: Can I use the stock crankshaft with a big bore kit?
For milder big bore kits like the 440, the stock crankshaft may suffice if the overall build is not excessively aggressive. However, for more extreme kits like the 453, or if you plan on very hard riding, it is highly recommended to consider an upgraded or reinforced crankshaft to handle the increased stresses and prevent potential failure.
Q3: What are the benefits of a big bore kit for the LTZ400?
Big bore kits significantly increase the engine's displacement, leading to substantial gains in torque and horsepower. This translates to quicker acceleration, higher top speeds, and improved overall performance, especially in demanding riding conditions.
Q4: Is it difficult to install a big bore kit?
Installing a big bore kit is a complex engine modification that requires mechanical expertise, specialized tools, and a thorough understanding of engine assembly. It is generally recommended to have this work performed by a qualified performance shop like CT Racing.
Q5: What is the difference between the 440 and 453 kits?
The 440 kit offers a moderate increase in displacement and is designed to run on pump gas with supporting modifications. The 453 kit is a more extreme upgrade, providing a significant power boost comparable to factory 450s, but it requires higher octane fuel and potentially a stronger crankshaft.
Conclusion
In summary, your Suzuki LTZ400 absolutely comes with a crankshaft as standard. For those looking to push the boundaries of performance, CT Racing offers expertly developed big bore kits that can transform your ATV. Whether you opt for the versatile 440 kit or the formidable 453 kit, understanding the associated requirements, such as exhaust systems, fuel octane, and potentially crankshaft upgrades, is crucial for achieving optimal performance and ensuring the longevity of your engine. Always consult with reputable performance specialists to make informed decisions about your LTZ400's build.
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