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'Bore-up' is a term frequently heard in motorcycle customization. It refers to a technique that increases displacement by widening the cylinder's inner diameter (the bore). Can it easily be done on your own bike? This piece explains the basics in an accessible way.
A bore-up job, as you learn on the ground, looks simple but is actually deep. Widening the bore connects to everything downstream — tuning, durability, all of it. Chasing displacement numbers alone without keeping balance is meaningless. Customization isn't addition, it's design — that's how I see it.
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Just imagining your own bike reborn with a bigger displacement is exciting.
Even if they call it easy, it's precision work, so an amateur jumping in casually seems risky.
Can boring out an engine actually be done within what still passes vehicle inspection?
Crossing a displacement class boundary requires updating the vehicle registration too, so watch out for that.
Back in the day, bolting on a bore-up kit to bump displacement was a classic way to have fun.
With emissions regulations the way they are now, boring out an engine is already a higher hurdle than it used to be.
I'd only ever heard the term 'bore-up' but never really knew the actual work involved.
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