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In order.
Killermotorsport is where I ordered mine, no problems during the whole process, good communications with me.
Best sprockets will come down to use and personal preference. A 15/40, 16/43, or 17/45 (all the same basic ratio) is kind of the gold standard in best all around gearing. If you go with the 16/43 it will give you the ability to change between front sprockets to suit the bike for various uses. 17/43 is a great street and highway combo. 15/43 will have better off road grunt.
Break in is roughly about 500 miles ish. Before the engine and trans really start to loosen up and deliver proper power.
Oil. 10w40, 15w40, or 20w50 for hot climates. Needs to be JASO MA rated for wet clutches. You can use motorcycle specific oil, or myself and many others run 15w40 Rotella T4.
I only run premium.
Pick fork oil to suit your preference, but 15w works well. Lighter oil for less dampening, heavier for more. I recommend changing fork oil every year,but you can do it every 2 years. I do recommend changing it immediately when you get the bike.
Best mods for power - exhaust is the biggest boost you will get for your dollar. Either a de cat and modify the stock muffler, or the crf230 ebay exhaust that many of us run. Other than that, airbox mod or a foam pod filter. I also recommend changing the stock spark plug for abetter name brand unit. The stock plug is junk. Ngk DPR8EIX-9 is what many of us run.
Other than that, a properly jetted carb is essential. Stock or Mikuni.
Maintenance tips, check out the link in my signature.
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