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sorry, you just sound a bit full of yourself. Street riding and dirt riding are very different. I'm willing to bet that your "great street bike rider" friends would leave you in the dust at the track or in twisties if they are truely great. So your logic that "I'm an expert because I ride better in dirt than people who don't!" is quite flawed. In fact, I would bet 10:1 that I would leave you (especially with you on your M50) miles behind at the first set of curves. Dirt bikes? Not my cup of tea, that isn't where my experience is.
You are lumping street riding as a whole on your pos M50 lemon bike. Here's a thought: since you are an expert and look like a pro, go pick up a street bike that actually has some performance associated with it.
The type of ride you are capable of with a 600cc sport bike, a ducati, a buell, etc, is very very different than what you are stuck with right now. You might be more in the offroad scene than the track/street scene, that is fine... but saying that you are not happy with any streetbike based on your M50 and your own lack of ambition to keep yourself interested doesn't quite cut it.
What I wan't to know is what street bike DOESN'T have quick acceleration and throttle response. Most sport bikes will raise their front wheel... but they definitely don't have offroad suspensions. They have suspensions that make sure that they will track a line at high speeds and won't get squirrely on you! I think you just feel like you are going fast offroad because it is bumpy terrain.
Maybe you can only ride your bike one way, but let me tell you, I'm not limited by such ailments.
It probably is good that you decided that dirt is so much better, since riding to the limit of crashing (and then crashing) in the dirt is usually not quite so dangerous as on the street (especially public streets). For everyone else, we are able to combine the sport and the practicallity without many issues. I like to challenge myself, but I still know my limits and I go out with the attempt to be as safe as possible.
Also, you feel like an old man riding your street bike because you BOUGHT AN OLD MAN BIKE. Go hop on a supersport and tell me you feel like an old man sitting on one of those... here's a tip: old men can't sit on them for more than a minute...
Your argument bothers me because you are basically saying: "All street cars are slow and can't maneuver because I bought this SUV and it doesn't perform like my rally car!!" answer: "try out the porsche or the corvette!". Thankfully, with motorcycles, the porsches, corvettes, ferraris, etc, of the bike world are a lot cheaper!