when we are about to start and run a motorcycle should we start it by our both feet on the ground with front brake holding or just with left leg on the ground with the right foot on the rear brake??
I usually start a cold engine with it on the stand. If I'm stopped while riding, I have the right foot on the brake and the left on the ground whenever possible.
You want to be able to sit on a motorcycle with both feet flat on the ground. In the real world, though, there are some bikes that you just can't do this--like dual sports, because they have such long suspension travel, so the seat is higher. In this case, riders will just put their left foot down and keep their right foot on the back brake (or put the right foot down and keep their right hand on the front brake, and this allows you to shift with your left foot). You don't have as much stability with only one foot down, especially if you don't have a lot of experience. So the one-foot technique is not recommended for beginners.
I'm not saying James is wrong, but I beg to differ. The bigger and heavier the bike is or when you have a passenger, the more you need to keep both feet planted solidly on the ground. Use a couple of fingers on the brake lever to keep it from rolling. If you're setting there with your right foot on the brake and your passenger suddenly leans to the right (such as turning around to see what's behind you), you can lose your balance and you, the bike and your passenger end up on the ground.
