You can add a
doctype but I'll leave it to others to add code comments.
The site looks good, but you may want to increase the size of the thumbnails just a bit. Layout and navagation seems to make sense. I'm not keen on black bacgrounds, but it doesn't seem to detract from the design on this site. The storefront in place of a logo is not a bad idea.
In the section on KTM, you say things like Quality, Performance, Inovation. The text does nothing to put this in context for the reader. Quality could mean 15% less time in the shop, and $400 dollars less in repair cost from what it usually costs to maintain these off road cycles.
Mention the famous racers who use KTM (and your other products), list links to reviews, list customer comments about your products and your service. In other words, take a little of what your staff says to prospective customers and put it on the site.
This is a nice looking site. It would be a good tie-in for an integrated marketing campaign which uses commercials, physical mailings, and a web site in a way which makes all more effective.