Thank you W8ye, for that clarification. I am looking for the a like 28-32cc engine. I already have the 28cc crank case but the jug is scored up a great deal so I decided to try and see if I could find a 32cc jug that may be a little better than the one I got and get a bit more power as well. If you have a pic of these twins could you be kind enough to post on here for me.