MOTEGI  - Casey Stoner's return from injury at this weekend's Japanese Grand Prix may complicate his Honda teammate Dani Pedrosa's bid to overtake Yamaha ace Jorge Lorenzo for the MotoGP title.But world champion Stoner vowed to go full out at this weekend's Japanese Grand Prix, shrugging off chances he may stall teammate Dani Pedrosa's MotoGP title bid. The Australian has missed the last three races after injuring his right knee in a qualifying accident at the Indianapolis Grand Prix in August. The accident made it mathematically impossible for him to retain his crown.His Repsol Honda teammate Pedrosa has won three of the last four races to trail championship leader and Yamaha ace Jorge Lorenzo by 33 points with four races remaining in the season. With 25 points going to the winner of each race, Stoner could still eat into the Lorenzo-Pedrosa battle towards his planned retirement at the end of the season."It's actually really good to be back," Stoner said at the Motegi track Thursday. "It was not the way I wanted to finish my last season, with the injury and having to sit out some races and not having a shot at the championship. But we're here to do the best job we can -- from here onto the end of the season. I feel even fresh so we'll just have to see how I get on with the bike tomorrow," said Stoner, who underwent surgery on August 30 and will turn 27 next week.When asked what he would do if his team tells him to help Pedrosa's bid for his first MotoGP title, Stoner replied: "They haven't and I don't believe they will. "As I've always said in the past, for me the championship is won fair and outright and not because of the result of the teammate helping you out," said the 2007 and 2011 MotoGP champion.Stoner won four races before the injury which knocked him out of title contention. He and the two front-running Spaniards have taken all the 14 races among themselves so far this season. Lorenzo, who won six races before finishing runner-up to Pedrosa in the last round at Aragon in Spain, said he was ready for another win."I'm always trying to fight for the pole position, always trying to fight for the podium, for the victory. This is my goal," said the 25-year-old, aiming for his second premier-class crown since 2010. "If it's possible to win the race, I'm gonna try. If it's not possible, podiums will be okay in the last four races."He now stands at 290 points against 257 for Pedrosa, with the season ending in Valencia in Spain after three Asia-Pacific stops in Japan, Malaysia and Australia over three weeks. Stoner is in third spot with 186. Lorenzo said he had been "progressively better" during the season with four wins to his name. "So I'm trying to do the same, trying to get focused and do well." About Stoner's comeback, the 27-year-old Pedrosa said: "It's good to have him back.""He's always competitive so I don't think he can't be fast now," he added. "But we cannot forget that we are always fast here," said the Spaniard, who beat Lorenzo into second spot here last year. Stoner won the MotoGP at Motegi in 2010 and Lorenzo in 2009.All the three leaders said they like the 4.8-kilometre (three-mile) geometric circuit. Stoner said the circuit was "very stop-start with a lot of hard braking and accelerating. It's pretty tough on the body and physically quite demanding".