Piston Kit
TWH piston kits are engineered for consistent combustion and optimal engine performance. We offer both standard cast pistons and forged piston options for selected models, providing enhanced strength and durability under high-load conditions. Each kit is manufactured to precise specifications for reliable fitment.
GSR/NEX/V125/SkyDrive 2V Piston Kit
Precision Fit • RIKEN Rings • Multiple Bore Sizes
🔧 Built for lasting performance with Japanese-grade reliability.
This Piston Kit is made for GSR, NEX, V125, and SkyDrive, available in four bore sizes — 14pin 61mm, 63mm, 63.5mm, and 66mm — to meet various tuning needs. The kit includes RIKEN-brand piston rings from Japan, ensuring excellent sealing, wear resistance, and combustion stability.
🔹 Available sizes: 14pin 61mm / 63mm / 63.5mm / 66mm
🔹 High-precision piston machining – For perfect fit and smooth travel
🔹 RIKEN piston rings – Japanese quality, excellent durability and sealing
🔹 Complete kit – Includes piston, pin, circlips, rings, and piston bush
Upgrade to the GSR / NEX / V125 / SkyDrive Piston Kit and enjoy responsive power with trusted precision.
JOG 50 Piston Kit 48mm
Clean seal. Stable geometry. Ready to rebuild.
This Piston Kit for Yamaha JOG 50 is sized at Ø48 mm to match the intended cylinder. The crown and skirt are finished to tight tolerances to support steady running and ring seal, while OEM-fit pin and clip interfaces make assembly straightforward for everyday refreshes or top-end service.
Highlights
🔹 Stable Ring Seal — Matched ring set helps maintain compression after proper break-in.
🔹 True Running Geometry — Controlled crown/skirt dimensions for smooth operation.
🔹 OEM-Fit Interfaces — Pin and clip grooves align with stock hardware for easy install.
🔹 Service Friendly — Clear orientation marks and standard assembly sequence.
🔹 Daily-Use Ready — Built for reliable commuting and regular maintenance cycles.
Product Specifications
✔ Bore Size: Ø48 mm
✔ Fitment: Yamaha JOG 50 (confirm year/engine variant)
✔ Type: Replacement piston kit (complete top-end wear parts)
✔ Focus: Engine refresh / ring seal consistency
✔ Package Includes: Piston ×1, Piston Rings ×1 set, Piston Pin ×1, Circlips ×2
Installation Notes
Use with a properly honed Ø48.00 mm cylinder; measure piston-to-wall clearance per spec.
File-fit ring end gaps to tolerance；observe ring marks and piston orientation arrow.
Lubricate pin/bosses and rings, verify circlips are fully seated.
Torque to manufacturer spec, then perform careful heat-cycle break-in and recheck compression.
Power You Can Trust.
RS 100 Forged Piston Kit
Forged strength. Precise fit. Tuning-ready crown.
This Forged Piston Kit is built for RS 100 engines requiring a Ø59 mm piston. The forged aluminum crown and skirt are finished to tight tolerances for stable running and ring seal. The blank (unmachined) crown lets engine builders set compression and squish after mock-up for the intended cylinder/head stack.
Highlights
🔹 Forged Construction — High strength and heat resistance when built to proper clearances.
🔹 Blank Crown — Unmachined head allows precise compression/squish setup for your combo.
🔹 Seal Consistency — Matched ring set supports reliable sealing and break-in.
🔹 True Geometry — Controlled skirt and pin-boss tolerances for smooth operation.
🔹 OEM-Compatible Interfaces — Pin and clip grooves designed for clean assembly.
Product Specifications
✔ Bore Size: Ø59 mm
✔ Material: Forged aluminum alloy
✔ Fitment: RS 100 (confirm year/engine variant)
✔ Focus: Engine rebuild / tuning-ready compression setup
✔ Package Includes: Forged Piston (blank crown) ×1, Piston Rings ×1 set, Piston Pin ×1, Circlips ×2
Installation Notes
Use with a correctly honed Ø59.00 mm cylinder; measure piston-to-wall clearance per spec.
Confirm piston-pin diameter/length matches your rod; replace pin bearing if needed.
File-fit ring end gaps to tolerance; observe ring marks and piston orientation arrow.
Lubricate pin/bosses and rings; verify circlip seating; torque to spec and perform proper break-in.
Power You Can Trust.