Dirt Bike Standard Bore Cylinder Kits – Complete OEM-Spec Rebuild Solution
Restore your engine's original performance and compression with our standard bore cylinder kits — the complete, no-compromise solution for rebuilding a worn or damaged top end back to factory specification. Each ... show more
Dirt Bike Standard Bore Cylinder Kits – Complete OEM-Spec Rebuild Solution
Restore your engine's original performance and compression with our standard bore cylinder kits — the complete, no-compromise solution for rebuilding a worn or damaged top end back to factory specification. Each kit is built to get you back on the track with reliable, race-ready power, without the guesswork of sourcing parts separately.
Why Riders Choose Our Standard Bore Cylinder Kits
Complete Kit, No Hunting for Parts – Includes cylinder, piston, rings, wrist pin, circlips, and gasket set for a full top-end rebuild in one box
OEM Bore Specification – Machined to factory bore size, preserving your engine's original compression ratio and power characteristics
Nikasil / Ceramic Coated Bores – Hard-wearing cylinder coatings improve heat dissipation and extend service life under demanding race conditions
Forged or Cast Piston Options – Choose the piston spec that matches your riding intensity, from trail use to full motocross racing
Precision Fit – Machined to tight tolerances for correct ring seal, compression, and smooth break-in
Wide Model Range – Available for Honda CRF, Yamaha YZ/YZF, KTM SX/SX-F, Kawasaki KX/KX-F, and Suzuki RM/RM-Z
The Right Fix for a Worn Top End
Worn bores, scored cylinder walls, and tired piston rings rob your engine of compression and power. Rather than patching individual components, a standard bore kit replaces everything as a matched set — so your rebuild comes back running exactly as it did from the factory, with no mismatched tolerances or premature wear.
Perfect For
- Post-crash or high-hours top-end rebuilds
- Riders restoring compression and power after a worn bore
- Workshops carrying out full engine rebuilds
- Racers wanting a fresh, reliable top end before a new season
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