The biker guys are boasting about their bike.
The other guy is just repairing his bike. He would need some extra wood.
This is the low-spoiler guide for "Teach those biker guys a lesson" puzzle in Justin Wack and the Big Time Hack. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.