Over 185,000 Parts and accessories in stock

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Tech Support Backed by Years of Riding Experience

Over 185,000 Parts and accessories in stock

Free Same-Day Shipping on orders over $89 Tech Support Backed by Years of Riding Experience

Cometic Engine for your 2021 Yamaha YZ250X

2021 Yamaha

YZ250X

Drive Type: Chain
Front Tire Size: 90/90-21
Rear Tire Size: 110/100-18
Spark Plug: BR8EG
Chain Size: 520
Chain Links: 114
Front Sprocket/Pulley Teeth: 14
Rear Sprocket/Pulley Teeth: 50

For reference only, please consult your owner’s manual to confirm your sizes

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Cometic Cylinder Works Big Bore Gasket Kit for 1999-2026 Yamaha YZ Dirt Bikes
$108.25

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Part #: 266272 Mfg Part #: 21009-G01

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Cometic Exhaust Port Gasket for 1999-2026 Yamaha YZ Dirt Bikes
$10.95

Part #: 265822 Mfg Part #: C7507EX

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Cometic Bottom End Gasket Kit for 1999-2026 Yamaha YZ Dirt Bikes
$69.14

Part #: 265821 Mfg Part #: C7507BE

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Cometic Crankshaft Seals for 2002-2026 Yamaha YZ Dirt Bikes
$17.95

Part #: 147684 Mfg Part #: C7803

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