The KLR 650 is very lean from the factory to meet emissions so you will likely need to rejet when installing the exhaust. I feel this jet kit is the best way to go. KLX jet kit
Hello,Alfa-stu, on my 2008 I did the klx kit from eagle mike. I told him my elevation and he set me up. Wow what a difference ! Later I installed a lexx slip on with no issues to the carb tuneing. Hope that helps
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