The gates will drop on the 2011 Motocross World Championship this weekend in Bulgaria.

The 2011 FIM Motocross World Championships starts this weekend in Sevlievo, Bulgaria.

Four times world champion Antonio Cairoli will have to defend his title from the likes of Belgian Clement Desalle, his compatriot David Philippaerts and his teammate Max Nagl, to mention just a few.

The return of Kiwi Ben Townley to the series will put more drama to the chase for the MX1 title.

Red Bull Teka KTM Factory racing’s Cairoli regained the MX1 world title in 2010 on the revolutionary 350 SX-F and handed the Austrian manufacturer the so expected MX1 title, which was last won by Heinz Kinigadner in 1985.

On his second year with KTM, the Italian is looking forward to achieve his fifth world title and be at the same level as Motocross legends such as Joel Smets, Georges Jobe, Eric Geboers and Roger De Coster.

Rockstar Energy Suzuki World MX1’s Desalle was second in 2010, but this season is committed to put things even more difficult to Cairoli and achieve his maiden MX1 World Championship.

His compatriot and former world champion Steve Ramon will race one more year for Suzuki and he will try to improve his fifth place from 2010.

David Philippaerts, who finished fourth in the MX1 World Championship last year, is looking forward to be on the podium this weekend in Sevlievo after having missed it in the last two years.

Grand Prix winner Steven Frossard has joined David Philippaerts in the Monster Energy Yamaha squad and both are really looking forward to hand Yamaha another world title.

Max Nagl arrives in Sevlievo focused on repeating his overall victory in front of the Bulgarian crowd and show to his rivals that he is fully fit again. The German is aware of his incredible potential and he knows that he is also able to achieve his maiden MX1 title this 2011 season.

Estonian Tanel Leok has joined the TM Racing Factory Team, while Ken De Dycker is back racing for LS Honda Racing together with Shaun Simpson.

Xavier Boog will be racing one more year for the Kawasaki Racing Team, together with Spaniard Jonathan Barragán and Sebastien Pourcel, who will miss the first Grand Prix’s of the season due to an injury suffered during the offseason.

Both Boog and Barragán have shown to be fully fit for this 2011 Championship, but they will have to measure their potential with the rest of the GP riders this weekend in Sevlievo.

Evgeny Bobryshev and Rui Gonçalves will race the first Grand Prix of the season this weekend being part of the new Honda World Motocross Team, while Townley is back to the FIM Motocross World Championship with the Team CLS Monster Energy Kawasaki Pro Circuit.

German Ken Roczen is the clear favourite for the MX2 crown after an impressive U.S. debut during West Coast Supercross.

German Ken Roczen seems to be the clear favourite to conquer the MX2 class. This year, 17-year-old Roczen is riding for the Red Bull Teka KTM Factory Racing MX2 team and his aim is to bring back the MX2 World Championship to his new squad.

Roczen’s new teammate, Jeffrey Herlings, will start this weekend his second season in the MX2 class and he will race to be on the top of the podium and improve his fourth overall position from last year.

Jeremy Van Horebeek is also joining Herlings in the Red Bull Teka KTM Factory Racing MX2 team.

Third in last year’s championship was Zach Osborne, who will start chasing a Grand Prix victory already this weekend in Sevlievo.

Swiss rider Arnaud Tonus, who finished third in the last GP of the 2010 season and seventh in the MX2 Championship, has joined Bike-it Cosworth Wild Wolf Yamaha team and will race together with Osborne.

Joel Roelants did a very consistent 2010 season and managed to finish fifth of the MX2 class.

Gautier Paulin could only be tenth last year, as he missed the four first Grand Prix’s of the season due to a broken fibula right before the season started.

The Monster Energy Yamaha rider showed his superb fitness by the end of the 2010 season by winning the penultimate Grand Prix and he is now looking forward to be back at the top of the championship standings starting from this weekend’s Grand Prix in Bulgaria.

Two British riders will form the line-up of Team CLS Monster Energy Kawasaki Pro Circuit. Tommy Searle is back from American to obtain the MX2 world title he missed in 2008, and Max Anstie has just arrived from the USA to prove his riding skills against the talented FIM MX2 World Championship riders.

Apart from hosting the first Grand Prix of the MX1 and MX2 classes, the prestigious Bulgarian venue will also host the first round of the FIM Women’s Motocross World Championship and the first round of the UEM EMX125.