do you know anyone in college that has access to a machine shop? or anyone who has access to a machine shop at work? even if you don't, it shouldn't cost that much at all. and it will be super reliable. i brought one of my heads into a local engine builders to get it decked for higher compression. they laughed and did it for free. i mean it is a 50cc. most of these guys deal with 5L v8's.