Five-eighth Jerome Ropati ran in four tries as the New Zealand Warriors smashed the Sydney Roosters 42-16 in Auckland.

The Warriors went on a second-half scoring riot against a hapless Roosters outfit in front of nearly 13,000 fans at Mt Smart Stadium to bring up their fourth straight win.

The New Zealand side also dominated in the first half, scoring first when prop Ruben Wiki crashed through a Roosters defensive line under intense pressure.

The one-way traffic continued a minute after the restart when forward Awen Guttenbeil set up a 30-metre break to the line by Ropati.

But the Roosters came roaring back with two tries after a turnover deep in defence.

Warriors hooker George Gatis came within a metre of the try line but his pass to no one in the tackle gave Roosters fullback Shaun Foley the chance to take a 70-metre run downfield before being brought down.

Sydney had the numbers out wide and winger Amos Roberts crossed over to open his side's account.

Prop Anthony Tupou followed that up with a 40-metre break before offloading to Iosia Soliola, who easily fended off a Warriors tackler to finish the job to make it 12-10.

But a Tupou attempt at a flick pass in the mid-field proved his undoing when it bounced off a teammate and hit the deck, allowing Warriors winger Patrick Ah Van to seize the ball and speed away to the try line.

New Zealand applied relentless pressure on the Roosters defenders for the rest of the first half but failed to score on at least three attempts until Ropati squeezed through two men and crashed over the top of another to bring up his second try.

Trailing 20-10 at the break, the Roosters soon fell further behind thanks to loose pass in their half which led to a turnover.

The Warriors kept the ball alive at the 10-metre line and bench forward Epalahame Lauaki bounced off three or four tacklers to dot down.

Ropati nailed the Roosters' coffin shut with his third score on a short grubber kick by centre Lance Hohaia which Ah Van picked up and got a diving offload away to the dashing standoff.

The Sydneysiders got one back when Warriors fullback Brent Webb failed to smother a grubber kick and Roosters winger Sam Perrett gathered the crumbs to touch down.

But usual programming returned as Ropati regathered his own kick and ricocheted off a defender for his fourth try and Ah Van got his second on the end of a floating cut-out pass out wide.

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