I spent my career in the publishing business and targeting a magazine at a small vertical audience is almost an impossibility because the cost of producing it in print and on-line would far outweigh the advertising or subscription revenue you could generate.
The only real dedicated motorcycle brand magazines that publish on a regular schedule are American Iron and Easy Riders but they have an audience of around a million Harley owners to work with. Even at that if their circulation reaches more than 6-8,000 combined I would be surprised. All the other bike books spread their articles around the other six or seven brands but even then they have to mix cruising, touring, sport, performance and even off road in order to generate a big enough audience to attract advertisers.
Putting out a magazine to serve Spyder riders, who own a machine that has only been on the market for five years, serving an audience that optimistically may be in the 30-40,000 range would be a sure-fire money loser. The circulation may reach about 3-4% of the market (about average for a special interest mag) but that would not be strong enough to interest advertisers who would have to pay a very high CPM (cost per thousand) to reach those prospects. It just would not be cost efficient for the advertisers when compared to the cost per thousand of reaching Lamont's 14,000 audience with this site.
Sure would be nice to read such a publication though.