[Biker_Andy]

Honestly compared to most Chinese machines the stock TT250 is totally fine for 70/30 riding at 50mph or less all day long. If your wanting 60-70mph then exhaust and carb is needed. Fork oil is only necessary if your really pushing it off road. I'm still running stock tubes on original tires, spark plugs and fork oil. I do recommend changing the chain relatively soon, mine took my case cover and swingarm out when it pulled apart. Stock one just stretches and stretches until it eventually fails.