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The P/N for the correct plug is 90338-14004-00. Yamaha dealer carries them for a couple of bucks. Don't forget that the o-ring and base gasket can leak also. Try the plug first.
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79F - owned since '89 - FJ fork mod, solo seat mod, Dyna 3Ω's, 14MM M/C (168K miles)
79SF - every day rider, solo seat mod, Brembo 16MM M/C, Accel 3Ω's, Supertrapp (125K miles)
"If it ain't broke, modify it"
30 year XS11 owner 
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