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Any recommendations for a TTR 90 jetting in Colorado? its just very boggy and wont idle unless im on the throttle. I dont plan on doing a exhaust but may do air box mod if people recommend.
 

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you could also just remove the snorkel and spark arrestor to lean out the mixture and see how it runs? if it runs better than you need to go leaner with your jetting. if it runs worse than you need to richen the mixture.
 
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