While the US motorcycle market posted a 36% decline last month compared to a year ago, BMW was busy posting up some impressive numbers. The German company is reporting its February 2010 sales numbers are up 52% compared to February 2009. The main reason for the surge: the 2010 BMW S1000RR superbike, which would make BMW’s gamble of competing head-to-head with the Japanese Four a venerable victory. More after the jump.