TOKYO, March 2 (Reuters) - Japan's Nikkei share average is expected to open with a positive tone on Friday following gains on Wall Street, but profit-taking ahead of the weekend may prevent it from breaking above a six-month high hit earlier in the week. "I think the market will try the upside in the morning but few may chase the upside aggressively given the recent overheating in the market," said a trader at a Japanese brokerage. Market players said the Nikkei was likely to trade bet