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take off the seat, shrouds, and gas tank. Then look under the frame there should be the top of your engine, there should be a peice of rubber covering with a bundle of wires running to it (it almost looks like a black hose). pull this plug cover out then there will be a deep hole that you need a special tool to get the plug out with (its deep you wont be able to see it!)

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13y ago
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Q: Where is spark plug on 1999 Yamaha wr400f?
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