50~100cc Big-bore Kits

50~100cc Big-bore Cylinder Kits - TWH

We offer high-performance 50~100cc big-bore cylinder kits suitable for various brands of motor scooters, such as Honda Dio 50, Yamaha JOG 50, etc.

Dio 50 Cylinder Kit

Dio 50 Cylinder Kit

Durable & Reliable Performance at an Affordable Price

The AF series performance cylinder kits are made for the Honda Dio 50 motor scooter with high-strength iron, offering excellent wear resistance and stability to ensure efficient combustion and long-lasting performance. Designed for routine maintenance or light modifications.

DIO 50 Ceramic Cylinder Kit 12pin 49mm

DIO 50 Ceramic Cylinder Kit 12pin 49mm

High-Performance Durability Upgrade for Maximum Power

The DIO Ceramic Cylinder Kit utilizes advanced ceramic coating technology to reduce friction, enhance durability, and improve heat dissipation. Designed for high-RPM performance, it ensures optimal sealing for better combustion efficiency, delivering superior power output. Whether for racing or everyday modifications, this kit maximizes your engine’s potential!

🔹 Ceramic Coating Technology – Reduces friction and enhances durability
🔹 High Heat Dissipation – Keeps engine temperatures low for better stability
🔹 Precision Machining – Ensures optimal sealing and combustion efficiency
🔹 Compatible with DIO Models – Direct installation with no modifications required

Product Specifications

Bore Size: 49 mm
Compatible Models: DIO AF17/AF18/AF27/AF28
Material: High-strength aluminum alloy + ceramic coating
Package Includes: Cylinder, piston, piston rings, piston pin, circlips

DIO-ZX Cylinder Kit

DIO-ZX Cylinder Kit

Durable & Reliable Performance at an Affordable Price

The ZX Cylinder Kit is made of high-strength iron, offering excellent wear resistance and stability to ensure efficient combustion and long-lasting performance. Designed for routine maintenance or light modifications, it comes in 44mm, 48mm sizes to meet different needs, keeping your engine in optimal condition!

🔹 High-Strength Iron Material – Provides superior durability and wear resistance
🔹 Precision Machining – Ensures optimal sealing and combustion efficiency
🔹 Durable & Cost-Effective – Ideal for routine maintenance and light modifications
🔹 Multiple Size Options – 44mm, 48mm to suit various setups
🔹 Compatible with ZX Models – Direct fit installation with no modifications required

Product Specifications

Bore Size: 44mm / 48mm
Material: High-strength iron
Compatible Models: DIO-ZX AF34/35
Design Features: Standard compression ratio for enhanced stability and durability
Package Includes: Cylinder, piston, piston rings, piston pin, circlips

Video: https://youtu.be/IUIZHAHV9DU

The ZX Cylinder Kit is a cost-effective and durable choice, ensuring stable and reliable performance—perfect for routine replacements or minor upgrades!

JOG 50 Cylinder Set 10pin 48mm

JOG 50 Cylinder Set 10pin 48mm

Cast-iron 48mm bore-up—tight seal, stronger low-mid pull.

The JOG 50 Cylinder Kit upgrades Yamaha JOG50 scooters to a 48mm bore. Its cast-iron cylinder body delivers a wear-resistant bore and stable clearances. With proper fueling and head matching, the added displacement supports a more responsive low-to-mid pull, while OEM-fit interfaces keep installation straightforward.

🔹 Performance Potential — 48mm bore supports stronger low-to-mid pull with proper fueling and head matching
🔹 Cast-Iron Cylinder Body — Wear-resistant bore with stable thermal behavior for long service life
🔹 Precision Machining — Honed bore and flat decks for consistent ring seal
🔹 OEM-Fit Interfaces — Stock-layout mounting for accurate, hassle-free assembly
🔹 Complete Kit — Cylinder, piston, rings, pin, circlips, gasket included

Product Specifications
Bore Size: 48mm
Material: Cast-iron cylinder
Fitment: YAMAHA JOG 50 scooters (year/market dependent)
Focus: Durable bore, tight sealing, responsive feel (with proper tuning), straightforward install
Package Includes: Cylinder, piston, piston rings, piston pin, circlips, cylinder gasket

Installation Notes
• Confirm cylinder head and gasket compatibility; set fueling (carb jetting / FI calibration) for the new bore.
• Follow standard ring break-in; re-torque fasteners after initial heat cycles.
• Inspect variator/roller tuning after the first test ride to match the new power curve.

Power You Can Trust.

Video: https://youtu.be/HuavFPBSoSg

JOG 90 Cylinder Set 12pin 54mm

JOG 90 Cylinder Set 12pin 54mm

Durable iron bore. Stable compression. Ready-to-ride rebuild.

This Cylinder Kit for Yamaha JOG 90 uses a cast-iron cylinder sized at Ø54 mm to support reliable ring seal and steady heat management in daily use. The matched piston/ring set and OEM-fit interfaces make assembly straightforward for routine top-end service or refresh builds.

Highlights

  • Cast-Iron Durability — Robust wear resistance and stable thermal behavior for commuting and hill rides.

  • Honed Ø54 mm Bore — Supports quick ring seating and consistent compression after break-in.

  • Matched Piston & Rings — Controlled geometry helps the engine run smooth with clean sealing.

  • OEM-Fit Deck & Studs — Cylinder interfaces align with stock cases and hardware for easy install.

  • Complete Top-End Package — Includes the cylinder gasket for a clean, leak-free assembly.

Product Specifications
Bore Size: Ø54 mm
Cylinder Material: Cast iron
Fitment: Yamaha JOG 90 (confirm year/engine variant)
Type: Top-end rebuild kit
Package Includes: Cylinder Body ×1, Piston ×1, Piston Rings ×1 set, Piston Pin ×1, Circlips ×2, Cylinder Gasket ×1

Installation Notes

  • Pre-lube and trial-fit; confirm piston-to-wall clearance and ring end gaps to spec.

  • Observe ring marks and piston orientation arrow; deburr ports if needed.

  • Measure squish clearance and compression; adjust with gasket thickness or spacers as required.

  • Torque cylinder/head fasteners in sequence; complete careful heat-cycle break-in, then re-check torque and compression.

  • For long-stroke builds, verify deck height/port timing and gasket stack before final assembly.

Power You Can Trust.

BWS100/ZUMA100 Cylinder Set

BWS100/ZUMA100 Cylinder Set

Cast-iron durability—56/57mm bolt-on options for BWS100 / ZUMA100.

The BWS100 / ZUMA100 Cylinder Kit comes in 56mm and 57mm bores for rebuilds or displacement upgrades. Its cast-iron cylinder body provides a wear-resistant bore with stable clearances, while precision machining keeps piston travel smooth and sealing consistent.

🔹 Cast-Iron Cylinder Body — Durable, wear-resistant bore with stable thermal behavior
🔹 Two Bore Options — 56 / 57mm to match your build goals
🔹 Precision Machining — Smooth piston motion and reliable ring seal
🔹 OEM-Fit Interfaces — Stock-layout mounting for accurate, hassle-free assembly
🔹 Complete Kit — Cylinder, piston, rings, pin, circlips, gasket included

Product Specifications
Bore Sizes: 56mm / 57mm
Material: Cast-iron cylinder
Fitment: YAMAHA BWS100 / ZUMA100 models (year/market dependent)
Focus: Durable bore, consistent sealing, straightforward install
Package Includes: Cylinder, piston, piston rings, piston pin, circlips, cylinder gasket

Installation Notes
• Confirm original bore and model year before installation.
• For bore-up builds, verify cylinder head and gasket compatibility; recheck fueling (carb jetting / air–fuel).
• Follow standard break-in for new rings; re-torque fasteners after initial heat cycles.

Power You Can Trust.

Video: https://youtu.be/qfILLSiyMG0