I got my wife a 1983 Urban Express last year and it's always been a little finnicky. I tuned the carb, cleaned it up quite a bit, swapped a bx31 belt on, and it was running 40ish on level ground with her piloting it. This year I decided I was going to go through it and add a cylinder kit, new carb, etc. I recently purchased an Athena 47.6mm 70cc kit and an curious if that's overkill for what she will do on it. She really wants it to be reliable and run 45-50MPH.
I also looked at the DR kits, but when I ran into an Athena on amazon for $139 I thought I couldn't pass it up. Now that I'm ordering the remainder of the small parts that I think I may need I'm second guessing if I made the right choice.
It is true that I'll need a new head to take advantage of the Athena? Is the DR kit really that much more "plug and play" than the Athena that the factory head will be sufficient once cleaned up?
I'm assuming either will need a new carb (please tell me if I'm wrong) and proper jetting to run safely and reliably. How large would you recommend and and ideas on rough jet sizes to start with in Kentucky summer weather (85-90* and high humidity)?
Sorry for the barrage of questions, but I'm a little out of my element here. Any input is appreciated(edited)