What would I have to get to bore my 125? Everywhere I look I see a 114cc or 88cc bore kitthe bore is the engines' barrel, or cylinder.
the kit's usually come with a new standard sized cylinder, new piston to suit, new rings, gudgeon pin, gudgeon bearing, and related gaskets.
when your engine is worn out, you can have the engine cylinder bored to suit an oversize piston/rings,
or-
you can use the new standard bore kits to replace a worn out or damaged cylinder, this is basically a top end rebuild.
or sometimes, f you can fit a bigger bore to your motor, then this can increase the engine size,
eg fitting a bigger bore to some 125s, will make it become a 138/140cc engine.
it depends if you can get one that has the same gudgeon pin sizes, so the new bigger piston will still fit onto your conrod, and also depends on whether the cylinder skirt of the big bore will fit inside your casing.
otherwise case machining is required to make it fit
another example- fitting a big bore to a YX160 can make the engine a 184cc engine.
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