maybe some of you repair and maintenance pros can help me. I have a honda recon utility that has started smoking out the tailpipe. I'll crank it up and it will be fine, then after a while, a bluish-white smoke will come out the tail pipe for a few minutes, then it will go away for a while and then come back. the motor sounds normal and the bike runs fine, but im concerned about whats causing it to smoke. any suggestions?

thanks in advance.