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Does a 2008 Vulcan Nomad have any of these valves? If so can they be cleaned or replaced? Wondering if any of these can be causing my engine to get a gravely sound when I hit my throttle fairly hard when engine is hot or riding on a hot day.
 

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Are you using premium (high octane) gas?Mine always rattles (knock and ping) like crazy,even with 93 octane

Oddly,I haven't noticed it lately though,and it's been crazy hot weather,which should make it worse.Maybe it differs with the humidity or something
 
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