Suzuki King Quad 700/750 Big Bore Upgrades

Suzuki King Quad 700/750: Unleashing More Power with Big Bore Kits

The Suzuki King Quad 700, and its successor the 750, are renowned for their robust build, excellent handling, and versatility in the off-road world. Often described as "bulletproof," these machines offer a fantastic blend of utility and sport. However, for riders seeking that extra edge in torque and horsepower, the aftermarket offers a compelling solution: big bore kits. This article delves into what a big bore kit entails for your King Quad, the types of pistons available, and crucially, whether machining is a necessary step in the process.

What is a Big Bore Kit and Why Consider One?

A "big bore" modification refers to increasing the internal diameter (bore) of the engine's cylinders. For the Suzuki King Quad 700, this typically means increasing the bore size from its stock 102mm to larger sizes, such as 104mm or 106mm. This increase in cylinder bore, when paired with a suitable piston, effectively increases the engine's displacement. For instance, going from the stock 695cc to a 106mm bore can result in a 750cc or even larger displacement, leading to a significant boost in torque and overall power output. This added grunt is particularly beneficial for tackling challenging terrain, hauling heavy loads, or simply enjoying a more exhilarating riding experience.

CP-Carrillo Pistons: The Pinnacle of Performance

When opting for a big bore upgrade, the quality of the piston is paramount. CP-Carrillo is a highly respected name in high-performance engine components, and their piston kits for the Suzuki King Quad 700/750 are designed for riders who demand the ultimate in performance and durability. These are not your average off-the-shelf pistons; they are forged, meaning they are manufactured by shaping aluminium at high temperatures, resulting in a much stronger and more resilient component compared to cast pistons. This enhanced strength is crucial for handling the increased stresses associated with higher compression ratios and larger displacements.

CP Pistons offer several key features:

• Forged Construction: Provides superior strength, durability, and resistance to heat and detonation.
• "X" Style Forging: Engineered for greater strength, reduced weight, and improved rigidity.
• Full Radius Dome Designs: Contributes to efficient combustion and power delivery.
• Oversize Valve Reliefs: Accommodates larger valves and high-lift camshafts, often used in performance builds.
• Double Forced Pin Oilers: Ensures adequate lubrication to the wristpin, reducing wear.
• Accumulator Groove: Helps control blow-by and improve ring seal.
• Anti-Detonation Grooves: Helps prevent pre-ignition or detonation.
• Lightweight Piston Pins: Reduces reciprocating mass for improved engine response.
• Balanced to +/- 1 Gram: Ensures smooth engine operation by precisely balancing rotating components.

Available CP Piston Options for Your King Quad

CP Pistons provides a range of options tailored to your King Quad's needs:

Does a Suzuki King Quad Big Bore Kit Require Machining?

Yes, in most cases, a big bore kit for your Suzuki King Quad will absolutely require machining. Specifically, when you increase the cylinder bore diameter beyond the stock size (e.g., from 102mm to 104mm or 106mm), the original cylinder wall is no longer sufficient. The cylinder must be precisely bored to the exact diameter required by the new, larger piston. This process is known as cylinder boring.

Furthermore, simply boring the cylinder is often not enough for optimal performance and longevity, especially with significant bore increases. This leads us to the crucial concept of the "deck conversion".

The Importance of Cylinder Deck Conversion

When a cylinder is bored oversize, the machining process can sometimes reduce the flat surface area at the top of the cylinder, known as the "deck." This deck is critical because it mates with the cylinder head and the head gasket to create a seal. A reduced sealing surface area can compromise the head gasket's ability to seal effectively under the high pressures generated by a bigger, more powerful engine. This can lead to leaks, blown head gaskets, and ultimately, engine failure.

A "deck conversion" modification addresses this by strategically machining the cylinder deck to increase the surface area available for the head gasket to seal against. This ensures a robust and reliable seal, even with the increased bore and potential for higher combustion pressures. Millennium Technologies is a specialist provider of this crucial service, ensuring the cylinder is prepared to the highest standards.

Combo Kits: The Convenient Solution

To simplify the process and often save on costs, many reputable suppliers offer "combo kits." These kits typically include:

• The CP-Carrillo forged piston kit (piston, rings, wristpin, circlips)
• A high-performance top-end gasket kit (e.g., from Cometic)
• The machining services: cylinder boring and replating (essential for the new bore size)
• The critical deck conversion modification

These kits streamline the upgrade by bundling the necessary parts and services. You will usually need to ship your original cylinder to the supplier for them to perform the machining and replating before it is sent back to you, ready for installation with your new piston.

Common King Quad 700/750 Issues and Considerations

While the King Quad is a durable machine, like any vehicle, it has known common issues that are worth being aware of, especially when undertaking performance modifications:

Frequently Asked Questions

Q: Will a big bore kit void my warranty?
A: Yes, significant engine modifications like a big bore kit will almost certainly void any remaining manufacturer's warranty on the engine components.

Q: How much more power can I expect from a big bore kit?
A: Gains vary depending on the specific kit, supporting modifications (exhaust, intake, camshafts), and tuning. However, a well-executed 750cc big bore kit can realistically add anywhere from 10-20% more horsepower and a significant increase in torque.

Q: What else should I upgrade when installing a big bore kit?
A: Consider upgrading your exhaust system for better flow, an aftermarket air intake, and potentially a fuel controller (like a Power Commander) to properly tune the air/fuel mixture for the increased displacement. A stronger cam chain (like the BPRATV Heavy Duty Cam Chain) is also a wise upgrade.

Q: Can I do the big bore installation myself?
A: While installing the piston and gasket kit itself is feasible for a mechanically inclined individual, the critical cylinder boring and deck conversion require specialized machinery and expertise. It is highly recommended to have these machining aspects performed by a professional machine shop or the supplier of your big bore kit.

Q: What is the difference between a 722cc and a 750cc kit?
A: The 722cc kit typically uses a 104mm bore, while the 750cc kit uses a 106mm bore. The larger bore of the 750cc kit generally results in more displacement, torque, and horsepower, but may also require more precise machining and potentially a higher compression ratio for optimal results.

Conclusion

Upgrading your Suzuki King Quad 700 or 750 with a big bore kit, particularly one featuring high-quality CP-Carrillo pistons, is an excellent way to significantly enhance its performance. Understanding the necessity of cylinder boring and the crucial "deck conversion" modification is key to a successful and durable build. By choosing reputable parts and seeking professional machining services when needed, you can transform your King Quad into an even more formidable off-road machine, ready to conquer any trail.

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