MONTREAL -- Michael Schumacher tightened his grip on the Formula One points lead with a workmanlike win Sunday in the Canadian Grand Prix, giving Ferrari its 150th victory.

The four-time world champion took the lead for good when pole-winner Juan Pablo Montoya made his second and final pit stop on lap 51 of the 70-lap event at Circuit Gilles Villeneuve.

	Michael Schumacher of Germany celebrates his fifth Canadian Grand Prix win.

Montoya moved back to second place when Schumacher's Ferrari teammate, Rubens Barrichello pitted, but his challenge ended on lap 56 when smoke began pouring from the engine on his Williams BMW and the 26-year-old Colombian pulled off the track.

Schumacher stretched his lead to an eye-popping 43 points after just eight of 17 races, putting him well on the way to matching Juan Manuel Fangio's record of five titles.

Asked if he might wrap up the championship by July, Schumacher shrugged.

"It's no point in thinking about it," he said. "We know we have a comfortable lead, but there is no point in thinking about when we can win it, just make sure we do win it."

David Coulthard, whose McLaren Mercedes won two weeks ago in Monaco, inherited second place and fought off a strong attack from Barrichello the rest of the way.

Meanwhile, the 33-year-old Schumacher cruised to his sixth victory in eight starts this season. The German, who also has a second and a third in 2002, added another 10 points to his lead as both Montoya and his Williams teammate, Ralf Schumacher, failed to score.

Michael's younger brother had a fueling problem in the pits at mid-race and had to make an extra stop. He wound up seventh, one place out of the points.

Montoya and Ralf Schumacher remain tied for second, now trailing 70-27, with Coulthard one point behind in fourth.

When Montoya went out of the race, Coulthard trailed the leader by nearly 22 seconds. Schumacher running the race on only one stop, eased off in the waning laps to conserve fuel and the Scot wound up only about 1.1 seconds behind.

"It was the usual story," the winner said of his narrow margin at the end -- about 20 car-lengths. "I was just flogging it safety home. One tenth (of a second) is enough to win the race and that's what we're looking for."

Kimi Raikkonen, driving the other McLaren, wound up fourth, followed by Giancarlo Fisichello's Jordan Honda and the Renault of Jarno Trulli.

Fourteen of the 22 starters were running at the end of the 305.049-kilometer event.

Montoya got off to a good start and led through the first few turns before Barrichello, who had passed his teammate on the start, overtook the youngster and grabbed the lead.

Jacques Villeneuve, the local favorite, disappointed the huge crowd when he pulled to the side of the track and climbed out on the ninth lap. His BAR-Honda was stopped in a dangerous position and race officials chose to send the safety car onto the course and slow the field in order to remove it.

Barrichello, working on a two-stop strategy, criticized that decision, saying, "The car was parked and nobody was going to hit it. I don't know why they couldn't have just rolled it backwards, out of the way. That was my race."

Williams took a chance of an early pit stop, bringing Montoya in for fuel and tires under the full-course yellow flag on lap 14. That gave the lead to Barrichello.

Montoya came back onto the track in fifth place, but passed both his teammate and Raikkonen in the next few laps after the track went green on lap 18. He took over second place when Barrichello, pitted on lap 25, giving up the lead to Schumacher.

That's the way it stayed until the leader made his only stop on lap 38, giving up the top spot to Montoya. Schumacher had built a lead of nearly 24 seconds and was able to get out of the pits in second place.

He bided his time until Montoya made his second pit stop and that turned out to be the race.

Schumacher, the defending series champion, extended his own F1 record for career victories to 59.