Flying from Toronto to Tokyo, but connecting Newark (with a 1hr27min layover). Questions:

1. Will I need to recheck bags in Newark or will they go straight to Tokyo? Both flights will be through United. I may not check any bags, but just wondering if I have the option. If I have to recheck bags I simply won't check any -not worth it with a tight connection.

2. Is 1hr27min enough time to connect? I know I will have to take a shuttle bus to the other side of the airport. So I am slightly concerned I suppose.

Thanks for the help.