Hey guys, I was wandering what the difference between a 125 mark 2 and mk 3 is, I've got 1 of each neither of which have a mower to go on. I was thinking of making a vintage style twin engine kart with them using these plans and was hoping there isn't much difference, power wise at least.

Also, is there anywhere I can get a new piston for one of these? The MK 3s piston is missing a chunk, said chunk looks like it broke off while it was running! shocked

Thanks

Hayden