A friend has asked me to see if anyone can point him in the direction of a piston or rings for a montesa 123 trials bike, from memory it was the first proper trials bike he owned & his first new bike
This is what he wrote
I would like to get a new piston and/or rings for my Montesa 123. It seems they are like rocking horse shit. Only one I found was on a French classic trial website and was a whopping 177 euros.
Does anyone know where to find a piston/rings for a 1973 Montesa Cota 123, 54 mm bore size. First choice would be a 1st oversize piston and rings, second choice a Std piston and rings or third choice a set of std rings. Does anyone know of a piston or rings from another make of engine that will fit or can be modified to fit? The gudgeon pin is 14 mm.