It's clear that either English is not your first language, or you are not familiar with the culture of youths and young professionals in the US. This may present a problem since that appears to be your target demographic.

1. You don't need to put "TM" everywhere, especially not on the main logo of your website and in forum posts. Notice how nobody else does this. It looks out-of-touch and off-putting to most people.

2. "Motorcrossing" is not a thing, nobody says that. For one, it's "moto" without the 'r'. Second, it is not commonly said in gerund form. This is just one issue with choosing to focus on the "-ing" suffix. Baseballing? Soccering? Photographing? They just don't make sense that way.

3. Another issue is the way that form modifies the base words. The way you highlight it on your site changes "diving" to "div-ing," which is strange. This is because the word "dive" is not fully preserved. Same goes for "dat-ing."

4. "Inging" is not something I would likely say out loud. Similarly, "What is your *ing?" is awkward. Personally I think it would be very difficult to build an identity and community around "ing," not to be attempted unless you have a strong grasp on cultural linguistic trends.

5. The parallax scroll of the top image does not work well on iOS. On chrome it does not move until the scrolling stops, and on safari it is very janky.