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Seals Gaskets & Hardware
Snowmobile Seals, Gaskets & Hardware
The seals, gaskets, and hardware on a snowmobile are the components that hold everything together and keep every fluid, pressure, and mechanical system functioning the way it was designed to. They are not glamorous. Nobody gets excited about an oil seal or a base gasket the way they get excited about a performance pipe or a new track. But ask any experienced snowmobile mechanic what the most common cause of expensive engine damage is, and the answer almost always comes back to a failed seal or gasket that was ignored until it caused a secondary failure that cost ten times what the original repair would have. The hardware that holds your sled together matters in ways that only become obvious when a fastener vibrates loose on the trail and the component it was securing takes the consequences.
Snowmobiles operate in conditions that are uniquely challenging for seals and gaskets. Extreme cold temperatures cause rubber seals to harden and lose their ability to conform to mating surfaces. Repeated thermal cycling from cold starting temperatures to operating temperature and back again stresses every gasket joint on the engine with expansion and contraction that accumulates over a season of hard riding. Water, snow, and the salt and grit that gets onto the sled during parking lot and road travel accelerate corrosion on hardware and compromise the protective coatings on fasteners in ways that make removal difficult and replacement necessary. Mad Lads Moto stocks seals, gaskets, and hardware for all major snowmobile platforms to support rebuilds, repairs, and routine maintenance. Here is what we carry:
- Complete Engine Gasket Kits - Full engine gasket sets covering every gasket and seal in the engine from the cylinder head through the cases, ideal for complete engine rebuilds where everything gets replaced in one comprehensive service.
- Top End Gasket Sets - Head gaskets, base gaskets, exhaust gaskets, and all associated top end seals needed for piston and cylinder replacement jobs without disassembling the entire engine.
- Bottom End Gasket Sets - Case gaskets, cover gaskets, and crankshaft seals for bottom end rebuilds and case splitting jobs on two-stroke and four-stroke snowmobile engines.
- Crank Seals & Oil Seals - Two-stroke crank seals, output shaft seals, and oil seals that are critical to maintaining proper crankcase pressure and preventing air leaks that lean out the fuel mixture and cause engine damage in two-stroke powerplants.
- Individual Gaskets - Single gaskets for targeted repairs where only one seal has failed and a complete kit is more than the specific job requires, covering head gaskets, base gaskets, exhaust gaskets, and cover gaskets for all major platforms.
- Chaincase Seals & Gaskets - Chaincase oil seals, chaincase gaskets, and associated sealing components for chaincase service and rebuilds where oil leaks or contamination require attention.
- Bearing Seals & O-Rings - Bearing seal kits, O-ring sets, and precision sealing components for suspension, drivetrain, and engine bearing locations across all major sled platforms.
- Chassis Hardware & Fasteners - Replacement bolts, nuts, washers, screws, clips, and push pins for body panels, suspension components, engine covers, and chassis assembly points where original hardware has been lost, stripped, or corroded beyond reuse.
- Thread Repair & Hardware Accessories - Thread repair inserts, anti-seize compounds, threadlocking compounds, and hardware accessories for dealing with the stripped threads and seized fasteners that accumulate on any sled that sees serious use in corrosive conditions.
Two-stroke crank seal condition is one of the most critical and most frequently overlooked maintenance items on any two-stroke snowmobile. Crank seals control crankcase pressure and prevent air from entering the crankcase from outside the engine. When they deteriorate, crack, or lose their sealing ability, air enters the crankcase and leans out the fuel mixture in ways that cause overheating and piston damage that looks identical to a jetting problem on inspection. A sled that runs fine at one elevation and then runs lean and hot at altitude after a jetting change that should have solved the problem often has leaking crank seals that are contributing to the lean condition independently of the jetting. Replacing crank seals as part of any bottom end rebuild regardless of their apparent condition is the correct approach for any serious snowmobile mechanic. We stock seals, gaskets, and hardware for Ski-Doo, Polaris, Arctic Cat, Yamaha, and Lynx. Use our year, make, and model fitment tool to confirm fitment before you order.