GOOFIT
44mm Big Bore Cylinder Kit (53cc-54cc Upgrade) for 2-Stroke 47cc 49cc Pocket Bike ATV
44mm Big Bore Cylinder Kit (53cc-54cc Upgrade) for 2-Stroke 47cc 49cc Pocket Bike ATV
5.0 / 5.0
(7) 7 total reviews
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Product Overview
Unlock the full potential of your mini ride with the GOOFIT 44mm Big Bore Top-End Kit. Designed as a high-performance upgrade for standard Chinese 47cc/49cc 2-stroke engines, this kit increases displacement to 53cc-54cc, delivering an impressive 2hp - 3hp boost. Whether you are racing or off-roading, this precision-engineered kit provides the extra torque and acceleration needed to dominate the track.
Product Compatibility
This is a Performance Upgrade Part for 2-stroke small engines. It converts standard 47cc/49cc motors into high-output 53cc/54cc powerhouses.
| Vehicle Category | Compatibility | Performance Gain |
| Pocket Bikes | Chinese 47cc / 49cc Super Bikes | +2hp to 3hp Boost |
| Mini Quads / ATV | 43cc-50cc Kids ATVs & Quads | Enhanced Low-end Torque |
| Mini Dirt Bikes | 47cc / 49cc Pit Bikes | Faster Acceleration |
Specifications
| Attribute | Details |
| Cylinder Bore | 44mm / 1.73" (Big Bore) |
| Piston Pin Length | 37mm / 1.46" |
| Effective Displacement | 53cc - 54cc |
| Engine Type | 2-Stroke Air-Cooled |
| Material | Hardened Coated Alloy & High-Strength Steel |
Key Features
- Instant Power Upgrade: Specifically engineered to boost your regular engine's output by 2hp - 3hp, providing a significant increase in both top speed and climbing power.
- Precision Hardened Coating: The cylinder inner walls feature a specialized hardening treatment and anti-corrosion coating, ensuring stable performance during sustained high-speed operation.
- High-Compression Piston: Paired with a high-strength forged piston that reduces friction and vibration, maximizing energy transfer and engine responsiveness.
- Superior Gas Sealing: Precision-manufactured components eliminate air leaks and ensure exceptional sealing, keeping your engine running at peak efficiency for years.
- Direct Performance Fit: Designed as a top-end replacement for most Chinese-made 2-stroke 47cc/49cc engines, making professional-grade tuning accessible for DIY enthusiasts.
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Fitment FAQ
Will this part fit my specific model and year?
This cylinder piston kit is intended for This is a Performance Upgrade Part for 2-stroke small engines. It converts standard 47cc/49cc motors into high-output 53cc/54cc powerhouses.; Vehicle Category; Compatibility; Performance Gain; Pocket Bikes; Chinese 47cc / 49cc Super Bikes; +2hp to 3hp Boost. Key physical/spec details from the product data include Cylinder Bore: 44mm / 1.73" (Big Bore), 44mm / 1.73" (Big Bore), Piston Pin Length: 37mm / 1.46". Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this cylinder piston kit, also compare the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height.
What models or situations does this part not fit?
Do not order this cylinder piston kit for machines outside the listed compatibility, or for units with different bore sizes, piston-pin diameters, stroke lengths, stud spacing, or gasket patterns. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. Recheck listed specs such as Cylinder Bore: 44mm / 1.73" (Big Bore), 44mm / 1.73" (Big Bore), Piston Pin Length: 37mm / 1.46". If any connector, mounting point, size, or year detail is different, confirm fitment before installation.
Excellent kit, only wish it will come with the carburetor and reed valve. For the price is worth it
First of all it works great but if you read all the other reviews its always missing the carbon reeds is there any way you can send them to me i was looking forward to getting them it kind of ashamed me of how it shows in pictures it comes with everything but always missing stuff.
Quick shipping considering from China plus very high quality, I'm impressed and will buy from this vendor again without any worries.
Excellent Quality and Value!!
When my pistons in my 2 stroke engine started to rumble and give me issues, I knew immediately that I needed to change my bore. I went onto Amazon and found this product. It came with all the right parts, and arrived quickly. I would purchase this again in a heartbeat.