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Gaskets & Seals

Motorcycle Engine Gaskets, Seals & Bearings

Gaskets, seals, and bearings are the unsung heroes of every engine rebuild. They do not make power. They do not add speed. But without them doing their job correctly, nothing else works the way it should. A blown head gasket bleeds compression and lets coolant into places it does not belong. A leaking crank seal on a two-stroke engine pulls air into the crankcase and leans out the fuel mixture in ways that destroy pistons and bearings fast. A worn wheel bearing or swingarm bearing that goes unaddressed long enough will eventually compromise handling and safety in ways that no amount of suspension tuning can fix. Getting these components right during a rebuild is what separates a job that lasts from one that comes apart six months later.

Mad Lads Moto stocks a comprehensive range of gaskets, seals, and bearings for two-stroke and four-stroke dirt bikes, motocross bikes, enduro machines, trail riders, and street motorcycles. Whether you are chasing an oil leak, doing a complete engine rebuild, or replacing worn bearings throughout the chassis, we have what you need. Here is what we carry:

  • Complete Engine Gasket Kits - Full engine gasket sets that cover every gasket and seal in the engine from top to bottom, ideal for complete rebuilds where you want everything fresh in one purchase.
  • Top End Gasket Sets - Head gasket, base gasket, and all associated top end seals needed for a piston and cylinder replacement without pulling the entire engine apart.
  • Bottom End Gasket Sets - Case gaskets, cover gaskets, and crankshaft seals needed for bottom end rebuilds and case splitting jobs.
  • Individual Gaskets - Single gaskets for targeted repairs where only one seal has failed and a complete kit is more than the job requires.
  • Crank Seals & Oil Seals - Two-stroke crank seals, four-stroke oil seals, and output shaft seals that keep oil and fuel mixture where they belong and air out of where it does not belong.
  • Engine Bearings - Main bearings, rod bearings, transmission bearings, and crank bearings in OEM-spec dimensions for precision rebuilds that restore proper clearances.
  • Wheel Bearings & Seal Kits - Front and rear wheel bearing kits, hub bearing sets, and associated seals for restoring smooth, play-free wheel rotation.
  • Linkage & Swingarm Bearings - Suspension linkage bearing kits, swingarm pivot bearings, and needle bearing sets that restore the precise, rattle-free feel that worn suspension pivots destroy over time.
  • Steering Head Bearings - Tapered roller and ball bearing steering head kits that eliminate the vague, notchy steering feel caused by worn or pitted steering bearings.

Cometic gasket sets have earned a reputation as the gold standard in the industry, used by professional race teams and home mechanics alike for their consistent sealing quality and precise fitment across hundreds of applications. All Balls Racing is the go-to source for bearing and seal kits, offering complete wheel bearing kits, linkage kits, and steering head bearing kits that bundle everything needed for a bearing replacement into one part number. For individual engine bearings, sticking to established bearing manufacturers with verified clearance specifications is critical. A cheap bearing installed in a critical location is never worth the few dollars saved. We stock gaskets, seals, and bearings for Honda, Yamaha, Kawasaki, Suzuki, KTM, Husqvarna, Beta, GasGas, and more. Use our year, make, and model fitment tool to confirm fitment before you order.

How do I know if my two-stroke crank seals are leaking?

Leaking crank seals on a two-stroke engine cause air to enter the crankcase, which leans out the fuel and oil mixture and significantly increases the risk of engine damage from heat and inadequate lubrication. Symptoms of leaking crank seals include difficulty starting, an erratic or inconsistent idle that cannot be tuned out with the air screw, a tendency to run lean and overheat under load, and in some cases visible oil residue around the seal area on the outside of the engine. The most reliable way to confirm a crank seal leak is a pressure and vacuum test of the crankcase, which reveals leaks that visual inspection alone cannot detect. Crank seals are inexpensive parts that should be replaced as a matter of course during any bottom end rebuild regardless of their apparent condition.

How often should I replace wheel bearings on my dirt bike?

Wheel bearing service intervals depend heavily on riding conditions and how well the bearings are protected from water and dirt ingestion. Riders who frequently ride in mud, water crossings, and sandy conditions should inspect wheel bearings every few months and replace them at the first sign of roughness, play, or noise. Trail and enduro riders who spend time in wet terrain often find that wheel bearings need replacement once or twice per season. Motocross riders on dry tracks can typically go longer between replacements. The test is simple: with the wheel off the bike, spin the bearing by hand and feel for roughness, grinding, or inconsistency, and check for side-to-side play by rocking the wheel on the axle. Any roughness or play means the bearings are due for replacement.

Do I need a complete gasket kit or just individual gaskets for my repair?

It depends on the scope of the job. For a complete engine rebuild where the engine is fully disassembled, a complete engine gasket kit is almost always the most cost-effective choice since it covers every gasket and seal in the engine and ensures nothing is
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