LOS ANGELES (MarketWatch) -- Japan stocks enjoyed another day of explosive opening gains Monday, with the benchmark Nikkei Stock Average JP:100000018+1.38%climbing 1.6% to 9,169.58 in the early minutes, and the Topix gaining 1.7%, after the yen struck a seven-month low against the U.S. dollar. Major exporters were among the top gainers, as the dollar rose to the mid-¥81 range, and the euro closed in on the ¥104 mark amid hopes a possible change of Japanese government will push greater monetary easing. Toshiba Corp. JP:6502+3.19%TOSYY+2.91% jumped 3.9%, Hitachi Ltd.JP:6501+2.07%HTHIF+0.76% added 3%, Komatsu Ltd. JP:6301+2.68%KMTUF+0.56% rose 3.8%, Canon Inc. JP:7751+3.56%CAJ+3.37% gained 4%, and Toyota Motor Corp.JP:7203+2.26%TM+2.28% advanced 2.6%. Shares of Nintendo Co. JP:7974+0.66%NTDOF+0.84% rose 2.3% as the firm launched the Wii U in the U.S., its first home videogame console in six years. Honda Motor Co. JP:7267+0.96%HMC+3.36% rose 1.7% after a Nikkei business news report Saturday that the firm had raised its Japan sales target by 16% for the fiscal year ending in March.