I'm new to this Forum. I Purchased a used 2004 TW200 with 240 miles on it in July for $2000. I'm having a BLAST riding it. Now that I've got it what can you tell me about it? I have changed the oil and filter. I checked out the forum on changing the oil filter so I do have the correct filter with the holes in it. What else can you guys tell me about my TW? From a maintenance perspective what else should I be doing or looking out for? I see people talking about an O-ring chain. Please tell me about that, what is it and what's the advantage? I'm looking forward to being apart of the forum.