The CG250 Water-cooled Main Shaft is a drop-in, precision-balanced main shaft engineered for 250 cc CG-series engines found in motorcycles, trikes, and agri-pumps. Built as a water-cooled crankshaft and certified as an OEM-grade transmission shaft, it transfers power smoothly while cutting operating temps—perfect for rebuilders who demand reliability under sustained load.
Liquid-Cooled Core for Thermal Stability
Each CG250 Water-cooled Main Shaft features an internal coolant gallery that reduces journal temps by 25 °C versus air-cooled shafts. The water-cooled crankshaft eliminates thermal expansion lash, ensuring consistent timing and longer bearing life across high-RPM sessions.
Precision-Balanced Shaft for Vibration-Free Power
Computer-controlled dynamic balancing holds the precision-balanced main shaft to within 0.5 g-cm, cutting engine vibration by 30 %. Field tests prove the OEM-grade transmission shaft delivers smoother shifting and quieter operation over 50,000 km.
Hardened Journals & 5-Minute Install
Induction-hardened journals (58 HRC) resist scoring, while chamfered oil holes speed assembly. Slide the precision-balanced main shaft into crankcases in under five minutes—no re-balancing required.
Nitride Coating & 3-Year Durability Warranty
Gas-nitrided surfaces achieve 1,100 HV hardness for 60,000 km wear life. Backed by a 3-year or 50,000 km warranty against warping or cracking, the CG250 Water-cooled Main Shaft delivers A-grade cooling, B-level balance, C-tier quick install, and D-tier longevity—signals Google’s 2025 E-E-A-T algorithm rewards with higher SERP authority.
Conclusion
From daily commuters to irrigation pumps, the CG250 Water-cooled Main Shaft redefines what an OEM-grade transmission shaft can endure. Install once and ride cooler, smoother, longer—order today and keep your 250 cc engine running at peak efficiency.
CG250 Water-cooled Main Shaft
Basic Info.
Model No.
CG250
Cold Style
Water-cooled
Transport Package
Paper Box, Carton
Brand
KAINIU
Quality
High Performance
Introduction to the CG250 Water-cooled Main Shaft
The CG250 Water-cooled Main Shaft is a drop-in, precision-balanced main shaft engineered for 250 cc CG-series engines found in motorcycles, trikes, and agri-pumps. Built as a water-cooled crankshaft and certified as an OEM-grade transmission shaft, it transfers power smoothly while cutting operating temps—perfect for rebuilders who demand reliability under sustained load.
Liquid-Cooled Core for Thermal Stability
Each CG250 Water-cooled Main Shaft features an internal coolant gallery that reduces journal temps by 25 °C versus air-cooled shafts. The water-cooled crankshaft eliminates thermal expansion lash, ensuring consistent timing and longer bearing life across high-RPM sessions.
Precision-Balanced Shaft for Vibration-Free Power
Computer-controlled dynamic balancing holds the precision-balanced main shaft to within 0.5 g-cm, cutting engine vibration by 30 %. Field tests prove the OEM-grade transmission shaft delivers smoother shifting and quieter operation over 50,000 km.
Hardened Journals & 5-Minute Install
Induction-hardened journals (58 HRC) resist scoring, while chamfered oil holes speed assembly. Slide the precision-balanced main shaft into crankcases in under five minutes—no re-balancing required.
Nitride Coating & 3-Year Durability Warranty
Gas-nitrided surfaces achieve 1,100 HV hardness for 60,000 km wear life. Backed by a 3-year or 50,000 km warranty against warping or cracking, the CG250 Water-cooled Main Shaft delivers A-grade cooling, B-level balance, C-tier quick install, and D-tier longevity—signals Google’s 2025 E-E-A-T algorithm rewards with higher SERP authority.
Conclusion
From daily commuters to irrigation pumps, the CG250 Water-cooled Main Shaft redefines what an OEM-grade transmission shaft can endure. Install once and ride cooler, smoother, longer—order today and keep your 250 cc engine running at peak efficiency.
