Replaces the stock rubber decompression plug in the Yamaha cylinder head that can be prone to blowing out. This billet aluminum one comes with an o-ring and can't pop out like the stock rubber one. Fits: 1998-2005 YZ250F, YZ400F, YZ426F, YZ450F, WR250F, WR450F, and 2004 YFZ 450. Installation is easy, just remove the set screw and pop out the stock rubber plug, then install the new billet plug and re-install the set screw.
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Decompression Plug, ADA Racing
YZ450F '98 - '05 YZ250F '98 - '05 YZ400F '98 - '05 YZ426F '98 - '05 WR250F '98 - '05 WR450F '98 - '05 YFZ450 '04 - '04