Sorry for this question but, I am new to KLR's and wasn't able to find answers via search. I purchased a 2011 KLR 650 with 10K on the clock. The previous owner installed a DG pipe. Other than that, I believe the engine is stock. The bike easily starts up and runs great. However, I notice a very small flat spot just under 4K rpm's. It is pretty minor but I feel it. Additionally, I pulled the tank to fix a broken petcock. While I had the tank off, I pulled the plug. Plug itself, is in great shape however, Electrode is on the white side. Definitely running lean. I do get some popping on deceleration as well. air cleaner is foam. My guess is the previous owner did not rejet the carb after installing the pipe. As a result, I am thinking I have stock needle and jets in the carb. Hence, my question. Is the stock needle adjustable? I understand, here are no clips on the needle but wasn't sure if it could be shimmed. Not sure if I should just raise the needle (hypothetically, one position) or add next size larger main jet. Then again, I guess another (and maybe better) option is to install the KLX kit? Any and all thoughts are appreciated!