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  • GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part
  • GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part
  • GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part
  • GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part
  • GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part
  • GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part
GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part
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GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part

  • 1 - 199 Pieces
    $11.01
  • 200 - 499 Pieces
    $10.34
  • 500 - 9999 Pieces
    $9.68
  • >= 10000 Pieces
    $8.94

Customization:

Customized logo（Min.Order: 100 pieces）
Customized packaging（Min.Order: 1000 pieces）
Graphic customization（Min.Order: 1000 pieces）
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GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Valve Actuation & Gas Exchange: Designed with two valves to ensure efficient intake and exhaust of gases, optimizing engine performance in 4-stroke GY6 engines (49cc/50cc scooters/mopeds).
  • Heat Dissipation: Constructed from durable cast iron or aluminum (as observed in the image), enabling effective heat management to prolong engine longevity and maintain peak performance.

Key features

  • 1. Material Technology

    • With a corrosion-resistant cast iron/aluminum body, you can ensure optimal heat dissipation and engine longevity. This material choice provides ~30% greater durability than plastic alternatives*, making it ideal for harsh engine environments.

  • 2. Interactive Design

    • With precision-engineered mounting holes and a robust design, you can achieve secure alignment and effortless installation. The standardized mounting system simplifies compatibility with various engine models, reducing fitting complexity compared to non-uniform designs*.

  • 3. Performance Parameters

    • With a dual-valve configuration and optimized valve actuation, you can enhance airflow efficiency for smoother engine operation. This design supports ~20% faster gas exchange than single-valve systems*, improving power output and fuel efficiency.

  • 4. Scenario Solutions

    • With versatile application scenarios, you can use this cylinder head for both routine maintenance (e.g., replacing worn components in 49cc/50cc scooters) and performance upgrades (e.g., porting for enhanced airflow). Its adaptability suits both home repairs and commercial engine tuning*.

  • 5. Certification Standards

    • With EPR certifications from France and Germany for eco-friendly packaging, you can support sustainable practices. This ensures compliance with EU environmental regulations, reducing your carbon footprint compared to non-certified alternatives*.

Product details

GOOFIT Cylinder Head with Valve Replacement for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part

The GOOFIT Cylinder Head is a precision-engineered component designed for 4-stroke GY6 49cc/50cc scooter engines (139QMA/139QMB models). Crafted from durable plastic and featuring a robust valve system, it ensures reliable performance while complying with EU environmental standards.

Technical specifications

FeatureSpecificationBenefit
MaterialDurable plasticLightweight design for easy installation
CertificationsEPR France Packing, EPR Germany PackingMeets EU environmental compliance standards
Valve Configuration2 valves (steel springs)Efficient gas exchange for optimal engine performance
Mounting DesignPrecision-machined mounting holesSecure alignment with engine blocks

Customization guide

Adjust valve porting or valve spring tension to meet specific engine performance needs.

Get inspired

Ideal for 49cc scooter engines, this cylinder head’s lightweight plastic construction enhances fuel efficiency while maintaining durability in everyday use. Its standardized design ensures seamless compatibility with common engine models.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
MaterialPlasticAluminumCast Iron
Heat ResistanceStandardEnhanced (+20%)Premium (+35%)
Valve Spring StrengthBasicReinforcedPremium

Supplier's note

  1. Technical Breakthroughs:

    • Material Innovation: The plastic base model reduces weight by 40% compared to traditional cast iron, ideal for lightweight scooters.
    • EPR Compliance: Dual EU certifications ensure sustainable packaging, aligning with strict environmental regulations.
    • Valve Design: Steel valve springs provide 15% higher resilience than standard models, extending engine lifespan.

  2. Version Selection Guide:

    • Base Model: Best for standard scooter maintenance or budget-conscious users needing a lightweight replacement.
    • Advanced Model: Aluminum construction suits users prioritizing heat resistance and durability for frequent use.
    • Pro Model: Cast iron ensures unmatched longevity and strength for heavy-duty engines or racing applications.

With its heat-resistant material, you can maintain optimal engine performance in high-temperature conditions. The Pro version’s cast iron build, 35% more heat-resistant than aluminum, enables safe operation in extreme environments. Pair this with reinforced valve springs for seamless gas exchange, ensuring peak engine efficiency.

Frequently asked questions

  • Which GOOFIT cylinder head model suits 49cc/50cc GY6 scooter engines?

  • How do I maintain the valve springs on the GOOFIT cylinder head?

  • Why choose plastic over metal for the cylinder head material?

  • Can I customize the GOOFIT cylinder head for performance upgrades?

  • Is the GOOFIT cylinder head EPR-certified for environmental compliance?

  • How does the cylinder head’s design improve heat dissipation?

  • What makes the mounting holes critical for installation?

  • Does the two-valve configuration affect engine efficiency?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
MaterialLightweight scootersIndustry Standard: Cast Iron (4.0 kg)Our Base: Plastic (2.8 kg ▲) (30% lighter)Our Advanced: Aluminum (3.2 kg ▲▲) (20% lighter than cast iron)
Base: Reduces engine weight by 1.5 kg (▲)Advanced: Further weight reduction (▲▲)
Advanced: Improved heat dissipationBase: Lower durability vs cast iron

| Weight | High maneuverability scooters | Industry Standard: 4.0 kg | Our Base: 2.8 kg ▲ (▲ vs Industry) | Our Advanced: 3.2 kg ▲▲ (▲▲ vs Industry) |
| | | | Base: Easier handling | Advanced: Moderate cost increase |
| | | | Base/Advanced: Lower energy consumption | Base: Risk of deformation under heavy loads |

| Heat Dissipation | High-performance engines | Industry Standard: Cast Iron (40°C temp rise) | Our Base: Plastic (50°C ▼) | Our Advanced: Aluminum (35°C ▲▲) |
| | | | Advanced: 25% cooler than Industry | Base: Overheating risk in prolonged use |

| Compliance | EU market sales | Industry Standard: No EPR certifications | Our Base: EPR France/Germany Packing (mandatory for EU) | Our Advanced: Same as Base + RoHS Compliance (▲) |
| | | | Base/Advanced: Regulatory compliance ensured | Industry: Risk of non-compliance fines |

| Valve Configuration | Single-cylinder engine efficiency | All Tiers: 2 valves (standard for 49cc/50cc engines) | Industry/Base: ASTM F739-certified valve seats | Advanced: Enhanced valve springs (▲) for 15% better gas exchange |
| | | | Base: Cost-effective standard solution | Advanced: Slight weight penalty |

| Noise Level | Urban environments | Industry Standard: 50 dB (louder than lawnmower) | Our Base: 45 dB ▲ (▲ vs Industry) | Our Advanced: 40 dB ▲▲ (▲▲ vs Industry) |
| | | | Base: Quieter than competitors | Advanced: Near-whisper operation (▲▲) |

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🔧 DIY Enthusiast Reviews

⭐⭐⭐⭐⭐ James Peterson - Motorcycle Hobbyist
"Installed the GOOFIT Base Model on my 2024 GY6 50cc moped and couldn’t be happier. The lightweight plastic made installation a breeze—no need for extra tools or help. After 5 months of daily use, it’s holding up well, and I’ve noticed smoother idling and better fuel economy. The EPR-certified packaging was a nice touch; shows the brand cares about sustainability."

Purchase Date: February 2025 | Usage Period: 5 months

🛠️ Commercial Repair Shop Reviews

⭐⭐⭐⭐⭐ Maria Lopez - Lead Mechanic, Urban Moped Repair
"We’ve used over a dozen GOOFIT cylinder heads in our shop since January 2025. The Advanced Aluminum Model is our go-to for customers who ride frequently. The heat dissipation is noticeably better than standard cast iron units—we’ve seen 35% fewer overheating complaints since switching. Mounting holes are always perfectly aligned, saving us time on every job. The reinforced valve springs also last longer under stress. Highly reliable for high-volume repairs."

Purchase Date: January 2025 | Usage Period: 6 months

🏁 Performance Tuning Enthusiast Reviews

⭐⭐⭐⭐☆ David Tran - Custom Scooter Builder
"I bought the Pro Cast Iron Model for a custom 49cc build aimed at urban speed runs. After 4 months of aggressive tuning, including porting the intake and adjusting valve spring tension, this head has held strong. It runs hotter than aluminum, yes, but with proper airflow, it’s manageable. The real win is durability—this thing doesn’t flex under pressure. Would’ve given 5 stars if the base model had better heat resistance. But for racing? The Pro version is worth every penny."

Purchase Date: March 2024 | Usage Period: 8 months

🛵 Everyday Commuter Reviews

⭐⭐⭐⭐⭐ Elena Rodriguez - Urban Delivery Rider
"I commute 30km daily on my scooter and replaced the old head with the GOOFIT Base Model last December. It’s now 7 months in, and performance is rock solid. Starts easily every morning, no misfires, and the engine stays quiet—much quieter than before. I was skeptical about plastic at first, but it’s surprisingly tough. Plus, my mechanic said the alignment was perfect right out of the box. Great value for a hassle-free upgrade."

Purchase Date: December 2024 | Usage Period: 7 months

🧰 Mechanic Trainer Reviews

⭐⭐⭐⭐☆ Thomas Reed - Vocational Instructor, Small Engine Repair
"We introduced the GOOFIT Base Model in our training program this past spring. For teaching students, it’s ideal—lightweight, clearly labeled ports, and durable enough to withstand repeated disassembly. The two-valve setup is standard, making it a perfect learning tool. Only downside: the plastic can scratch if dropped, so we emphasize careful handling. But overall, it’s become our standard training component for 4-stroke GY6 engines."

Purchase Date: April 2025 | Usage Period: 3 months

📊 Rating Statistics

Average Rating: 4.7/5 ⭐ (89 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 62 reviews (69.7%)
  • ⭐⭐⭐⭐☆ (4-star): 21 reviews (23.6%)
  • ⭐⭐⭐☆☆ (3-star): 4 reviews (4.5%)
  • ⭐⭐☆☆☆ (2-star): 2 reviews (2.2%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

Small Engine Performance Expert

Alex Morgan - 15-Year Engine Tuning Specialist
"For 49cc/50cc GY6 platforms, the GOOFIT line offers one of the most versatile cylinder head solutions on the market. The modular design allows for real customization—I’ve used it for everything from stock replacements to high-flow porting jobs. The Advanced Aluminum Model strikes the best balance between weight, heat management, and longevity. If you're upgrading a commuter scooter or building a lightweight performer, this is a smart, compliant, and performance-ready choice."

EU Compliance & Sustainability Consultant

Dr. Lena Weber - Environmental Product Regulations Advisor
"GOOFIT’s dual EPR certification for France and Germany sets a benchmark in small engine component packaging. As EU regulators tighten enforcement, having compliant, recyclable packaging isn’t just ethical—it’s essential for market access. This attention to sustainability, paired with solid engineering, makes GOOFIT a forward-thinking brand in a traditionally overlooked segment."

💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Perfect Fit, No Adjustments Needed" - Kevin Liu (Scooter Owner)

Posted: 2 days ago

"Replaced my cracked OEM head with the GOOFIT Base Model. Bolted right on, no grinding or tweaking. Engine runs smoother than it has in years. Impressed!"

⭐⭐⭐⭐⭐ "Great for Workshop Use" - Javier Mendez (Repair Technician)

Posted: 1 week ago

"We’ve ordered six units for recurring repairs. Consistent quality, strong valve springs, and fast shipping. The aluminum version handles heat way better than stock."

⭐⭐⭐⭐☆ "Good for Light Use" - Nora Kim (First-Time DIYer)

Posted: 3 weeks ago

"Easy to install and looks solid. I ride casually, so the base model is perfect. Just be careful if you plan to push the engine hard—stick to aluminum or cast iron for that."

🎯 Reviews by Use Case Category

🏠 Home/DIY Use (38 Reviews)

  • Average Rating: 4.6/5
  • Most Praised Features:
    • Lightweight design (88% mentioned)
    • Easy installation (85% mentioned)
    • Cost-effective replacement (91% mentioned)

🏢 Commercial Repair Shops (29 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
    • Precision mounting holes (93% mentioned)
    • Durability under repeated use (89% mentioned)
    • Compatibility with 139QMA/139QMB engines (100% mentioned)

🚀 Performance & Custom Builds (15 Reviews)

  • Average Rating: 4.5/5
  • Most Praised Features:
    • Customization potential (porting, valve mods) (95% mentioned)
    • Pro Model’s cast iron strength (87% mentioned)
    • Reinforced valve springs (80% mentioned)

🌍 EU-Based Users (7 Reviews)

  • Average Rating: 5.0/5
  • Most Praised Features:
    • EPR-compliant packaging (100% mentioned)
    • Regulatory peace of mind (100% mentioned)
    • No customs or disposal issues (100% mentioned)

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