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Columbus
My Store
Cycle Gear ColumbusStore Details
Open Today Until 7pm
3635 West Broad Street
Columbus, Ohio 43228
614-869-3115
Over 160 Stores! Change your store.
What’s going on at Cycle Gear
Services
Experienced staff support available on site
Store Events
Meet the local riding community for Bike Nights & more
Shop the Store
Find out what’s in stock and ready to go
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Uh oh - Our system doesn't think this part will fit your 1999 KTM 300 EXC (change vehicle selection)

Athena

Athena Top End Race Gasket Kit Yamaha YZ250 / YZ250X 1999-2026

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Athena Top End Race Gasket Kit Yamaha YZ250 / YZ250X 1999-2026 Fullscreen Zoom
$18.95
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Athena Top End Race Gasket Kit Yamaha YZ250 / YZ250X

The Athena Race Gasket Kit meets the high precision demands of racing engines, providing a critical solution for modifying cylinder height. Engineered by accomplished technicians, the kit serves a wide spectrum of Motocross and Enduro engines, encompassing both 2-stroke and 4-stroke models. Each package contains a cylinder head gasket along with a pair of cylinder base gaskets— one matching the OEM thickness and another slimmed down by 0.1 mm for refined adjustments in squish clearance, combustion chamber compression or valve timing optimization.

Features:

  • Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during mid-season
  • Kit includes a top-of-the line MLSS head gasket and two or more premium-quality base gaskets of different thicknesses to optimize engine compression ratios
  • Gives the rider a choice of using standard gas with stock compression or race gas with a higher compression
  • Kit does not include valve stem seals, rubber parts, shims or other fiber gaskets
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Uh oh - Our system doesn't think this part will fit your 1999 KTM 300 EXC (change vehicle selection)

This Product Fits:

Yamaha
YZ250 1999-2026
YZ250 50th Anniversary Edition 2024
YZ250 70th Anniversary Edition 2026
YZ250 Monster Energy Race Edition 2023, 2024, 2025
YZ250X 2016-2026

This item is also available for 34 other models:

Gas Gas
EC 250F 2013-2015
Honda
CRF250R 2010-2017
CRF250R 2018-2021
CRF250RX 2019-2021
Kawasaki
KX250 2020
KX250F 2020
KX250F 2009-2016
KX450 2019-2020
KX450F 2019-2020
KX450F 2016-2018
KX65 2000-2026
KX85 2014-2025
Suzuki
RM65 2003-2005
Yamaha
WR250F 2001-2012
WR250F 2020-2025
WR450F 2016-2018
WR450F 2021-2023
YZ125 2005-2021
YZ250F 2001-2013
YZ250F 2019-2026
YZ250F 50th Anniversary Edition 2024
YZ250F 70th Anniversary Edition 2026
YZ250F Monster Energy Race Edition 2021-2025
YZ250FX 2020-2025
YZ450F 2014-2017
YZ450F 2020-2022
YZ450FX 2016-2018
YZ450FX 2021-2023
YZ65 2018-2026
YZ80 1993-2001
YZ85 2019-2026
YZ85 2002-2018
YZ85 Big Wheel 2022-2026
YZ85 Big Wheel 2002-2015
Product Style Item # Store SKU Manufacturer Product # Availability
Product Style Athena Top End Race Gasket Kit Yamaha YZ250 / YZ250X 1999-2026 Item # 10486598 Store SKU Manufacturer Product # R4856-267 Availability In Stock: Ships within 24 hours
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