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Hi there guys I need hellp with my jetting, im running stock gearing, UNI AIR FILTER with no air box lid, DUNCAN RACING SILENCER. The bike at the moment has a 182 main jet, 75 pilot, and a 42 slow. I think im running rick but the bike has run great and the exhaust doesnt smoke but my spark plug seem dark
 

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These are simple questions that have been answered many times. For 06+ hrc style mods jetting should be around 162-170 main depending on atmospheric conditions. Where I'm at in the Mohave Desert I run a 170 during the winter and 167 during the summer. 42 slow should be left as is.
 
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