First I made the horrible mistake of buying a engine kit from bike berry. The reason that's a bad idea, well they don't know what they have sold you. I want an extra cylinder and piston, heck that should be easy! NO I call them, tell them i have the BBR stage 4 kit. And want an extra cylinder and piston. What they tell me is you will need to figure out what you have. So here I am looking for help! My jug is 40mm intake and exhaust, Type A piston, the rod says zl40mm. Can anyone tell me what jug to buy? a link would be great, the best quality I can get. I would like an extra jug,piston,and upper bearing. ported jug would be better, that way I would't have to do it lol. Thanks for any help that you can give.