| Model | SB250S |
| Cylinder bore | φ70 |
| Excircle | φ76 |
| Headspace | 79.6 |
| Total length | 112.6 |
| Discharge volume | 250CM |
| Brand | KAINIU |


Unleash 250cc Engine Power with SB250S Cylinder Head
When it comes to unlocking the full potential of your 250cc vehicle’s engine or ensuring its long-term durability, investing in top-tier engine parts is non-negotiable—and the Cylinder Head is the heart of engine performance. The SB250S Cylinder Head stands out as a flagship choice for vehicle owners seeking uncompromised power, reliability, and versatility. As a core component of the cylinder assembly, it seals the top of the cylinder, houses critical parts like valves and spark plugs, and directly influences fuel economy, torque output, and the engine’s overall lifespan. Whether you need rugged motorcycle parts for off-road adventures or heavy-duty tricycle parts for commercial cargo transport, the SB250S Cylinder Head delivers consistent, high-caliber performance that meets the rigorous demands of 250cc engines.
Cylinder bore: φ70 mm – This carefully calibrated bore size enables smooth, low-friction piston movement, maximizing fuel-air mixing efficiency within the cylinder. The 70mm diameter optimizes combustion, directly boosting the engine’s responsiveness and power output—essential for 250cc vehicles that need robust performance for both high-speed rides and heavy-load tasks.
Excircle: φ76 mm – The outer diameter is designed to fit seamlessly with standard 250cc engine housings, allowing for effortless integration with existing motorcycle parts or tricycle parts setups. No complex modifications are required, saving you time and effort during installation.
Headspace: 79.6 mm – This generous headspace provides ample room for valve operation and efficient heat dissipation. It prevents engine overheating even during prolonged, intense use—whether you’re navigating steep off-road trails or hauling heavy cargo—and ensures stable performance in extreme temperature conditions.
Total length: 112.6 mm – Its robust yet well-proportioned 112.6mm length makes it compatible with a wide range of 250cc engine configurations. The design balances structural strength with space efficiency, adapting to the unique layout needs of both high-performance motorcycles and heavy-duty tricycles.
Discharge volume: 250CM – This optimized displacement capacity is tailor-made for 250cc engines. The 250CM volume delivers strong, consistent torque—ideal for motorcycle riders seeking thrilling acceleration and tricycle operators needing the power to carry heavy loads without straining the engine.
Improved Power Output: The φ70 mm cylinder bore and 250CM discharge volume work together to optimize combustion, delivering a significant boost in power. Motorcycle riders will experience faster acceleration and smoother performance at high speeds, while tricycle operators can haul heavier loads (up to 30% more than with standard heads) with ease.
Better Fuel Efficiency: Despite its power, the SB250S Cylinder Head ensures efficient combustion, reducing fuel waste by ensuring every drop of fuel is fully burned. This saves you money on fuel costs over time—whether you’re taking long rides or making frequent delivery runs.
Stable Heat Management: The 79.6 mm headspace and high-grade aluminum alloy material excel at heat dissipation, preventing engine overheating even during intense use. This stability reduces wear on other engine parts (like gaskets, valves, and pistons) and extends your engine’s overall lifespan by up to 25%.
Tailored for 250cc Engines: Its specifications (φ70 mm bore, 250CM volume) are perfectly matched to 250cc engine needs, ensuring optimal performance—unlike generic heads that may underperform or strain your engine.
Durability That Lasts: Premium materials and precision manufacturing mean the SB250S Cylinder Head requires fewer replacements, saving you money in the long run compared to cheap, low-quality engine parts that fail within 3–6 months.
Versatility for All 250cc Vehicles: Whether you own a motorcycle or tricycle, it fits seamlessly, making it a one-stop solution for motorcycle parts and tricycle parts users—no need to stock multiple part variants.
| Model | SB250S |
| Cylinder bore | φ70 |
| Excircle | φ76 |
| Headspace | 79.6 |
| Total length | 112.6 |
| Discharge volume | 250CM |
| Brand | KAINIU |


Unleash 250cc Engine Power with SB250S Cylinder Head
When it comes to unlocking the full potential of your 250cc vehicle’s engine or ensuring its long-term durability, investing in top-tier engine parts is non-negotiable—and the Cylinder Head is the heart of engine performance. The SB250S Cylinder Head stands out as a flagship choice for vehicle owners seeking uncompromised power, reliability, and versatility. As a core component of the cylinder assembly, it seals the top of the cylinder, houses critical parts like valves and spark plugs, and directly influences fuel economy, torque output, and the engine’s overall lifespan. Whether you need rugged motorcycle parts for off-road adventures or heavy-duty tricycle parts for commercial cargo transport, the SB250S Cylinder Head delivers consistent, high-caliber performance that meets the rigorous demands of 250cc engines.
Cylinder bore: φ70 mm – This carefully calibrated bore size enables smooth, low-friction piston movement, maximizing fuel-air mixing efficiency within the cylinder. The 70mm diameter optimizes combustion, directly boosting the engine’s responsiveness and power output—essential for 250cc vehicles that need robust performance for both high-speed rides and heavy-load tasks.
Excircle: φ76 mm – The outer diameter is designed to fit seamlessly with standard 250cc engine housings, allowing for effortless integration with existing motorcycle parts or tricycle parts setups. No complex modifications are required, saving you time and effort during installation.
Headspace: 79.6 mm – This generous headspace provides ample room for valve operation and efficient heat dissipation. It prevents engine overheating even during prolonged, intense use—whether you’re navigating steep off-road trails or hauling heavy cargo—and ensures stable performance in extreme temperature conditions.
Total length: 112.6 mm – Its robust yet well-proportioned 112.6mm length makes it compatible with a wide range of 250cc engine configurations. The design balances structural strength with space efficiency, adapting to the unique layout needs of both high-performance motorcycles and heavy-duty tricycles.
Discharge volume: 250CM – This optimized displacement capacity is tailor-made for 250cc engines. The 250CM volume delivers strong, consistent torque—ideal for motorcycle riders seeking thrilling acceleration and tricycle operators needing the power to carry heavy loads without straining the engine.
Improved Power Output: The φ70 mm cylinder bore and 250CM discharge volume work together to optimize combustion, delivering a significant boost in power. Motorcycle riders will experience faster acceleration and smoother performance at high speeds, while tricycle operators can haul heavier loads (up to 30% more than with standard heads) with ease.
Better Fuel Efficiency: Despite its power, the SB250S Cylinder Head ensures efficient combustion, reducing fuel waste by ensuring every drop of fuel is fully burned. This saves you money on fuel costs over time—whether you’re taking long rides or making frequent delivery runs.
Stable Heat Management: The 79.6 mm headspace and high-grade aluminum alloy material excel at heat dissipation, preventing engine overheating even during intense use. This stability reduces wear on other engine parts (like gaskets, valves, and pistons) and extends your engine’s overall lifespan by up to 25%.
Tailored for 250cc Engines: Its specifications (φ70 mm bore, 250CM volume) are perfectly matched to 250cc engine needs, ensuring optimal performance—unlike generic heads that may underperform or strain your engine.
Durability That Lasts: Premium materials and precision manufacturing mean the SB250S Cylinder Head requires fewer replacements, saving you money in the long run compared to cheap, low-quality engine parts that fail within 3–6 months.
Versatility for All 250cc Vehicles: Whether you own a motorcycle or tricycle, it fits seamlessly, making it a one-stop solution for motorcycle parts and tricycle parts users—no need to stock multiple part variants.