Hi, So my chopper got stolen (don't worry that's covered.) I'm interested in a new kit something that is either 2-4 stroke but just want a nice kit with warrenty looking to spend $150.00 complete. It's going on a 700c vintage bike I'd actually prefer a 4 stroke more any recommendations under budget? Still have to prefect anti theft system. NO CABLES. FYI IT ALSO HAS TO BE 50CC MANDITORY.