Custom Engineering Options
- Custom stroke and connecting rod configuration review
- Crank pin and counterweight requirements
- Surface treatment discussion
- Logo, private-label and packaging requirements
- Drawing- and sample-based development
GY6 Performance Crankshaft
This complete GY6 performance crankshaft assembly is available in standard and stroke-up configurations for 152QMI, 157QMJ, GY6 125 and GY6 150 applications. Please confirm the motorcycle model, engine code and original crankshaft specification before ordering.
- Application
- 152QMI / 157QMJ / GY6 125 / GY6 150
- Intended B2B use
- OEM replacement, street performance, racing and big-bore stroker B2B projects.
Confirmed Product Specifications
Values marked Project-confirmed require review against the final application, drawing or sample before production.
- Product
- GY6 Performance CrankshaftConfirmed
- Application
- 152QMI / 157QMJ / GY6 125 / GY6 150Confirmed
- Standard stroke
- 57.8 mm — OEM replacementConfirmed
- +2.5 mm stroke
- 60.3 mm — street performanceConfirmed
- +3.0 mm stroke
- 60.8 mm — racing / big boreConfirmed
- +4.0 mm stroke
- 61.8 mm — high performanceConfirmed
- +6.6 mm stroke
- 64.4 mm — extreme stroker / big boreConfirmed
- Overall length
- 285 mmConfirmed
- Flywheel thread
- M12 × 1.25Confirmed
- Drive end thread
- M12 × 1.25Confirmed
- Piston pin hole
- 15 mmConfirmed
- Splines
- 19Confirmed
- Main bearings
- IncludedConfirmed
- Configuration
- Complete crankshaft assemblyConfirmed
- OEM / ODM
- Project requirements reviewed before quotationProject-confirmed
Buyer Confirmation Checklist
- Motorcycle model and engine code
- Original crankshaft specification
- Required stroke configuration
- Sample or drawing if the required configuration differs
- Target quantity and branding or packaging requirement
Manufacturing and Quality Control
Foshan Ruizheng Machinery Manufacturing Co., Ltd. reviews manufacturing and inspection requirements against the confirmed project specification.
Crankshaft quality-control informationGY6 Performance Crankshaft FAQ
Answers are limited to the information available for this product reference and project review process.
What motorcycle or engine does this GY6 crankshaft fit?
This product reference is for 152QMI, 157QMJ, GY6 125 and GY6 150 applications. Please confirm the motorcycle model, engine code and original crankshaft specification before ordering.
Which stroke configurations are available?
Confirmed configurations are 57.8 mm standard, 60.3 mm (+2.5 mm), 60.8 mm (+3.0 mm), 61.8 mm (+4.0 mm), and 64.4 mm (+6.6 mm). Confirm the required application and configuration before quotation.
Are main bearings included?
Yes. Main bearings are included with this complete crankshaft assembly.
What are the confirmed thread and spline details?
Both the flywheel thread and drive end thread are M12 × 1.25. The crankshaft has 19 splines.
Can you review a sample or drawing for a GY6 project?
Samples, drawings and original specifications can be used to review the required GY6 configuration before quotation.
What information is required for quotation?
Please provide the motorcycle model, engine code, required stroke, original crankshaft specification, sample or drawing when available, and target quantity.