SANTA CLARA -- Defensive tackle Justin Smith declared his left arm "100 percent" recovered from a triceps injury that hindered him -- and the 49ers' defense -- late last season.

"We don't have a lot more time, so I'm ready to go and it feels great," Smith said Thursday before the first practice of training camp.

Defensive coordinator Vic Fangio wants his unit to "get back to basics" to clean things up this camp, according to Smith.

Last training camp, Smith occasionally razed quarterback Colin Kaepernick for running with the ball instead of attempting passes. After watching Kaepernick succeed as the starter over the 49ers' final 10 games, Smith is impressed by that dual threat.

"That's one cool thing about this game: it's all about opportunity," Smith said. "Now he's one of the top quarterbacks in the league. He seized the moment, and he's still doing that. It was pretty cool watching it from the beginning."

Smith conceded that he'll miss lining up next to Isaac Sopoaga, who's now on the Eagles, but that the 49ers have capable replacements in Glenn Dorsey and Ian Williams.

Smith declined to comment on another teammate, offering only "next question" when he was asked about Ahmad Brooks' alleged attack on Lamar Divens last month.