When I am repairing my car/bike, he comes with his bike (small plastic one) and gets under it and starts repairing act.

And he does it for long as I am repairing mine.

It's interesting that I don't live with him but he is copying my action but when I asked his mom if he helps with housework as he probably sees her doing a lot of housework, she said no.

I've no idea why getting under a bike is more appealing to him than doing stuff like cleaning with a mop and bucket.

kicks the dirt a bit

We call it iPad time.