A thick liner to fit more common pistons maybe? But a thick liner creates more heat.Or they put a alloy liner and nikasiled it.
I would go the otherway and put a cr500 piston in it
Its strange and accidental when modifying a 414 whith a thicker liner comming out at 360 Whats also a montesa capasity is.
A 360 barrel on a 414 you must put a piston in it whith a lower compression distance is`n it?
has a 414 the same crank as a 360 only whith bigendpin more to the outside? or has the 414crank a larger diameter?
in last case it must have also the 360 crankcase to put a 360barrel
i think it is a normal 414 .Th seller does`n know about it .Look to the other items you see he is a merchant.