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MotoXparts supplies high-quality motorcycle crankshaft bearings, dirt bike main bearings and complete crankshaft bearing & seal kits NZ riders trust for reliable performance. We understand that for engine builders and dedicated tinkerers, maintaining the integrity of this system is paramount. We stock a comprehensive range of motorcycle crankshaft bearings and high-grade dirt bike parts NZ wide to keep your machine screaming at peak Revs. Whether you’re rebuilding a bottom end or upgrading for racing, our selection pairs premium brands with practical advice.
Think of your crankshaft like a spinning jump rope — under the immense pressure and inertia of combustion, it is actually elastic rather than perfectly rigid. Bearings support this "elastic" shaft, allowing it to carry heavy dynamic loads through a thin, hydrodynamically lubricated film of oil.
From Hot Rods main bearings to All Balls Racing crankshaft kits, our components feature a robust steel backing and specialised alloys. These materials are engineered to withstand the dynamic pressures in the oil film, ensuring your crankshaft never makes direct contact with the bearing surface. A good crankshaft bearing determines engine smoothness, durability and how well your bike tolerates crankshaft run-out and bearing life limits. Poor bearings or incorrect installation accelerate wear, increase vibration and can cause catastrophic failure.
Crankshaft run-out and bearing life are closely linked. Excessive run-out causes uneven load distribution across the bearing race, leading to premature fatigue. Measuring run-out with a dial gauge and ensuring crank surfaces are within spec is essential before installing new bearings. If the run-out is outside manufacturer limits, consider crankshaft machining or replacement rather than fitting new bearings that will fail quickly.
We stock a wide variety of crankshaft bearing & seal kits NZ riders commonly request, including complete sets that contain engine main seals and the bearings you need for a full bottom-end refresh.
Popular choices include:
Pair these kits with our full engine gasket sets to ensure perfect sealing and longevity. For top-end work, check our range of top end rebuild kits and piston kits to match clearances and compression specs.
Replacing your MX crankshaft bearings is a precision task that directly affects your engine's longevity. For those performing a comprehensive overhaul, we recommend pairing your new bearings with our full engine gasket sets to ensure leak-free engine main seals.
While many riders are comfortable using top end rebuild kits, note that installing crankshaft bearing & seal kits often requires specialised heat/cold cycles and press tools. We strongly recommend that these complex jobs are completed by a professional mechanic to ensure correct tolerances.
Pro Tip: Once your bottom end is sealed and the engine is back in the frame, ensure your ignition is just as reliable. It pays to install fresh spark plugs to guarantee a consistent spark and prevent tuning issues during your first heat cycle.
A bearing driver or press, dial gauge for run-out checks, and torque tools are essential for a correct installation.
Replace if you notice play, metallic knocks, rough rotation or after a bottom-end failure. As a rule of thumb, it’s a good idea to inspect bearings during every major rebuild.
Signs of failing motorcycle main bearings include increased vibration, oil contamination, metallic noise and altered oil pressure.
Clean components, check crankshaft run-out, use a press or bearing driver, seat bearings squarely and torque components to spec.
Selecting the best crankshaft bearings for KTM, Honda or Yamaha starts with identifying model year, engine type and intended use. Racing and frequent hard riding demand bearings with tighter tolerances and better load capacity, while casual trail use may allow standard OEM-equivalent options. Consult product fitment details or contact our team for model-specific recommendations.
It depends on where you buy from, as quality varies. Reputable aftermarket brands like All Balls Racing often match OEM performance, but always verify tolerances and material specs. MotoXparts is a trusted supplier of crankshaft bearing & seal kits in NZ, and we only stock brands that we would use ourselves.
Light assembly grease is usually recommended for roller and ball bearings. As always, follow the kit manufacturer’s instructions.
Hamilton, New Zealand
Shipping daily across Australia & New Zealand (Excludes weekends and public holidays)New Zealand
021 861094Australia
+64 21 861094
At Motoxparts we are committed to bringing you MX parts and accessories and the highest quality Motocross parts at unbeatable prices. We also stock a large range of Mountain Bike Parts and accessories to allow you to shop in the one place. We are 100% New Zealand owned and operated. We stand-by our products with our quality guarantee. We will keep you riding longer and - even better - you'll be paying less for the parts.
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