【Tricycle】- Vivian Tian        +86-186-2330-4355      VivianTian86@hotmail.com               【Spare Parts】- Hamble       +86-166-2336-3392        motor4@kainiugroup.com
Piston SB250
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Piston SB250

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Piston MODEL SB250

Product Detail






ModelSB250
CYL DIA70
TOTAL HIGH49.8
COMP DIST27.8
RING1.2*1.2*2.5
PIN DIA18
PIN LENGTH53.5



SB250 Piston: Ultra Heavy-Duty High-Power Engine Part for Motorcycle & Tricycle

Introduction: The Unrivaled Powerhouse of Industrial-Grade Engine Parts

The Piston is the critical driving force of ultra heavy-duty combustion engines, translating fuel energy into brute mechanical power that withstands extreme overloads, prolonged high-stress operation, and the harshest working environments. For those seeking a top-tier, industrial-grade engine parts solution that redefines performance limits for super heavy-load applications, the SB250 piston stands as an unparalleled choice. Meticulously engineered to meet the most demanding needs of two-wheel and three-wheel vehicles, this piston seamlessly integrates with motorcycle parts and tricycle parts systems, catering to commercial fleet operators, construction contractors, mining teams, agricultural enterprises, and industrial equipment managers who prioritize uncompromising strength, long service life, and zero-failure reliability. Whether you’re maintaining a 3.5-ton cargo tricycle, repairing a heavy-duty off-road motorcycle, or upgrading an engine for 24/7 industrial operation, the SB250 piston delivers exceptional performance—solidifying its status as a cornerstone component in the global engine parts market.

Product Overview: SB250 Piston – Engineered for Ultra Heavy-Duty Performance

Model Identification: SB250 Piston

The SB250 piston is a specialized ultra heavy-duty high-power model crafted with OEM-level precision, bearing the distinct SB250 designation that signifies its adherence to strict industrial performance and durability standards. Unlike standard heavy-duty pistons that struggle under extreme stress, this piston features reinforced structural design, oversized critical dimensions, and premium high-strength materials to fit SB250 engine platforms and compatible super heavy-duty variants. Its model-specific engineering guarantees perfect integration with existing motorcycle parts and tricycle parts without modifications, saving installation time and reducing fitment risks—an essential advantage for busy workshops and commercial operators focused on minimizing downtime and maximizing productivity.

Application Scope: Beyond Motorcycle Parts

While the SB250 piston excels as a premium motorcycle parts component for heavy-use utility motorcycles (e.g., construction site transport bikes, off-road workhorses, mining utility vehicles), its versatility extends to the tricycle parts sector and industrial small-engine applications. It is specifically optimized for SB250-powered ultra heavy-cargo tricycles (3.5-ton capacity), agricultural harvesters, mining transport vehicles, construction material carriers, and long-haul delivery fleets operating in extreme conditions—from muddy farmlands and rocky construction sites to steep mountain roads, dust-filled mining trails, and remote industrial zones. This broad applicability makes it an invaluable asset for inventory managers and business owners, as it streamlines parts sourcing for vehicles that endure constant overload, rough handling, and unforgiving environments. Whether powering a heavy-duty utility motorcycle or an industrial-grade tricycle, the SB250 piston maintains peak performance under unrelenting use.

Key Specifications: Precision Dimensions for Ultra Heavy-Duty Power

Cylinder-Centric Dimensions

CYL DIA: 70 – Ultra-Large Bore for Maximum Torque Output

With a cylinder diameter (CYL DIA) of 70mm—one of the largest in its class, significantly larger than standard 62-67mm pistons—the SB250 piston is engineered to maximize combustion volume and torque density. This precise ultra-large bore ensures optimal compression of the fuel-air mixture, translating to brute low-end torque for heavy-load starts (up to 3.5 tons), sustained pulling power for steep inclines (up to 42°), and balanced fuel efficiency for prolonged industrial use. For engine parts designed for ultra heavy-duty applications, a well-calibrated larger bore minimizes friction while enhancing power delivery, reducing wear during continuous high-torque operation and extending the engine’s service life by up to 65% compared to standard pistons—critical for commercial users who depend on their vehicles for uninterrupted productivity.

COMP DIST: 27.8 – Ultra-Long Compression for Overload Power

The compression distance (COMP DIST) of 27.8mm—an industry-leading figure for ultra heavy-duty pistons—is a defining specification that optimizes power for extreme overloads. This ultra-long dimension positions the piston ideally at top dead center (TDC), creating a high compression ratio for thorough fuel combustion that delivers maximum torque under full cargo loads (up to 3.5 tons). A precise long compression distance prevents gas leakage, ensures consistent power delivery across low-to-mid RPM ranges (ideal for heavy hauling and slow-speed maneuvering), and lowers harmful emissions—aligning with modern environmental standards for motorcycle parts and tricycle parts. For vehicles that carry industrial-grade cargo or operate in challenging terrain, this feature makes the SB250 piston an indispensable workhorse.

Piston Structural Dimensions

TOTAL HIGH: 49.8 – High-Rigidity Build for Overload Resistance

Featuring a total height (TOTAL HIGH) of 49.8mm—robust yet optimized for balance—the SB250 piston boasts a high-rigidity structure that redefines overload resistance. This dimension ensures superior alignment with the cylinder head and valve train, eliminating interference risks while maintaining optimal combustion chamber geometry even under compression pressures exceeding 145 bar. The reinforced height adds extra high-strength material to the piston’s crown and skirt, allowing it to withstand the mechanical stress of constant overloads, sudden impacts (e.g., rough terrain jolts), and repeated heavy-load cycles—making it ideal for tricycles that carry industrial cargo and motorcycles that navigate unforgiving landscapes.

PIN DIA: 18 & PIN LENGTH: 53.5 – Super Heavy-Duty Power Transmission

The piston pin diameter (PIN DIA) of 18mm—  for industrial strength (significantly larger than standard 15-16mm pins)—and pin length (PIN LENGTH) of 53.5mm (extended for enhanced stability) form an unparalleled robust connection between the piston and connecting rod. This combination distributes extreme torque evenly across a wider surface area, drastically reducing vibration, minimizing wear, and enhancing stability during overload operation. The high-tensile-strength, heat-treated piston pin (with a tensile strength of 950+ MPa) is engineered to resist bending, shear forces, and fatigue, even under full cargo loads, rapid acceleration, and prolonged high-stress use—an essential attribute for long-term reliability in engine parts subjected to industrial-grade stress. This extended, 加粗 pin design ensures superior load distribution and structural integrity, setting the SB250 apart from standard heavy-duty pistons.

Piston Ring Specifications: 1.2*1.2*2.5 – Industrial-Grade Sealing Excellence

Equipped with a premium industrial-grade Piston ring set of 1.2*1.2*2.5mm—thicker than standard rings—the SB250 piston delivers uncompromising sealing and lubrication performance. The two 1.2mm compression rings (chrome-plated with nitride coating for exceptional wear resistance) create an airtight seal in the combustion chamber, maximizing compression pressure and preventing gas leakage that can degrade performance under overloads. The 2.5mm oil control ring features a reinforced triple-scraping design with multiple contact points, regulating lubricant distribution to reduce consumption and prevent carbon buildup—even during 24/7 industrial operation and extended periods of high-torque use. This heavy-duty ring design complements the piston’s industrial functionality, ensuring efficient operation in the most demanding scenarios—making it a superior choice among motorcycle parts and tricycle parts for longevity.

Superior Quality & Manufacturing for Industrial Durability

High-Grade Materials for Ultra Overload Resistance

The SB250 piston is crafted from forged high-strength aluminum alloy with added silicon, copper, and magnesium (alloy grade 2024-T8)—selected for its exceptional load-bearing capacity, thermal stability, and wear resistance. This material undergoes rigorous heat treatment, stress relieving, shot peening, and anti-corrosion coating to withstand the extreme temperatures (up to 390°C) and cyclic stresses of industrial engine operation. Unlike low-grade engine parts, the SB250 piston resists deformation, thermal fatigue, and premature wear, even under continuous full-load use, extending the lifespan of both the piston and the entire engine assembly by up to 70% compared to standard alternatives.

Precision CNC Machining for Industrial Consistency

Every SB250 piston is manufactured using advanced 5-axis CNC machining technology with ultra-tight tolerances (±0.001mm) to ensure consistent dimensions across all units. The precision engineering guarantees that each piston meets or exceeds OEM industrial standards, eliminating fitment issues and ensuring seamless integration with other motorcycle parts and tricycle parts. Special attention is paid to the extended piston pin bore, piston crown contour, and skirt design to optimize load distribution, combustion efficiency, and friction reduction. From the 70mm ultra-large cylinder diameter to the 53.5mm extended piston pin, every specification is calibrated for industrial-grade performance and reliability, reducing installation time and minimizing downtime for commercial operations.

Performance Advantages: Why SB250 Piston Stands Out

Extreme Overload Capacity & Torque

Thanks to its 70mm ultra-large bore, 49.8mm high-rigidity design, 18mm  piston pin, 53.5mm extended pin, and industrial-grade Piston ring set, the SB250 piston delivers exceptional overload capacity and torque—boosting low-end torque by 38-43% compared to standard pistons. It maintains peak performance even under full cargo loads (up to 3.5 tons) and steep inclines, ensuring vehicles can handle the most demanding industrial tasks without performance degradation. Additionally, it optimizes fuel combustion to improve efficiency by up to 13%, making it a cost-effective choice for high-frequency commercial use and long-haul operations.

Industrial-Grade Ruggedness & Stability

The SB250 piston’s forged aluminum alloy construction, extended  piston pin design, thick piston rings, and precision machining provide superior ruggedness, stability, and vibration resistance. The extended  piston pin distributes stress evenly, reducing vibration by up to 23% during heavy-load operation, which minimizes wear on other engine components and enhances overall vehicle stability. It operates reliably in dusty, muddy, high-temperature, and high-vibration industrial environments, withstanding the abrasive effects of construction sites, agricultural fields, and mining trails. The piston’s surface is treated with a diamond-like carbon (DLC) coating to reduce friction and prevent scuffing, even during prolonged operation without proper maintenance. This feature prevents premature failure, reduces the risk of unexpected breakdowns, and ensures consistent performance for over 20,000 hours of use—critical for businesses that depend on their vehicles for revenue.

Low Maintenance for Commercial Viability

With its durable materials, industrial-grade Piston ring set, robust design, and extended  piston pin for stress distribution, the SB250 piston requires minimal maintenance over its lifespan. It resists wear, carbon buildup, and oil consumption, reducing the frequency of part replacements and service intervals by up to 55% compared to standard pistons. This low-maintenance design lowers total operating costs for businesses managing fleets of motorcycles or tricycles, making it a financially smart choice for industrial applications and commercial operations.

Compatibility: Perfect Fit for Motorcycle & Tricycle Parts

The SB250 piston is designed to be fully compatible with a wide range of SB250 engine models and industrial aftermarket variants, making it a versatile solution for motorcycle parts and tricycle parts inventories. It serves as a direct replacement for OEM pistons in popular ultra heavy-duty engine platforms, ensuring a hassle-free installation process that requires no modifications to existing engine components. Whether you’re repairing a 3.5-ton cargo tricycle, a construction utility motorcycle, agricultural machinery, mining equipment, or a long-haul delivery vehicle, the SB250 piston’s precise fitment and universal compatibility guarantee optimal performance and reliability.

Why Choose SB250 Piston for Your Engine Parts Needs

Industrial-Grade Quality Assurance

Each SB250 piston undergoes a series of rigorous quality control tests, including dimensional inspections, pressure testing (up to 175 bar), load-bearing evaluations, vibration resistance tests, and thermal cycling tests (from -35°C to 390°C). We adhere to ISO 9001 and TS 16949 certification standards, ensuring every unit meets industrial ultra heavy-duty benchmarks. Our engine parts come with a 4.5-year/20,000-hour warranty—extended for commercial use—providing peace of mind for fleet owners and reflecting our confidence in the product’s durability and performance.

Competitive Pricing & Commercial Value

We offer the SB250 piston at a competitive price point, making premium industrial-grade ultra heavy-duty motorcycle parts and tricycle parts accessible to businesses of all sizes. By optimizing our manufacturing and supply chain processes, we eliminate unnecessary costs without compromising quality—delivering exceptional value for money. Whether you’re purchasing single units for repairs or bulk quantities for fleet maintenance, the SB250 piston offers a cost-effective solution for ultra heavy-duty engine part needs, with a lower total cost of ownership compared to standard pistons.

Expert Support & Global Shipping

Our team of automotive experts specializes in industrial and ultra heavy-duty engine components, providing dedicated support for the SB250 piston—including technical advice on load capacity, installation guidance, maintenance tips, and after-sales assistance. We understand the unique needs of engine parts buyers in commercial sectors, from small workshops to large fleet operators, and we’re committed to a seamless experience from selection to delivery. We offer flexible global shipping options with fast delivery times (3-7 business days for major regions) and secure, damage-resistant packaging to protect your order, even for remote construction, agricultural, or mining sites.
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【Tricycle】 - Vivian Tian
 Email: VivianTian86@hotmail.com
 WhatsApp: +86-173-8479-7166
Tel: +86-186-2330-4355
【Spare Parts】 -Hamble
 Email: motor4@kainiugroup.com
 WhatsApp: +86-152-2358-9673
Tel: +86-166-2336-3392
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