.. How to get the mine bike to work

It is missing a pisto... er... plunge... you should be some kind of doctor to solve this!

Yes, go and ask Doc! He is on the right, at the Viaduct.

Did you talk to him about spare parts? You should also talk with him like a handyman to another. Talk with him about handymen and mine bikes. Voilà, you got Avial Power Inventer!

Install it into the mine bike and off you go!

It wasn't that hard, really! Go find the inventer from the Junk Heap!

Yes, there are three power inverters. It is a skippable minigame to which you get hints from Doc. Ask help from him.

Great! You now have a working Avial Power Inverter. Go install it to the bike and get the lamp. The bike works now.