85 aero with 50cc engine

[parker05_05]

New to scoots and to the forum. So hey whats up guys. What are my options to rebuild my new to me 1985 aero 50? It has low compression so I pulled it apart and needs a cylinder and piston kit. Or a piston kit and a bore job. Not sure what all the options are. What parts are available stock or big bore? Thanks.

[Wheelman-111]

Greetings:

Honda-san does make several "Oversize" pistons if you decide to return to stock form. There are a lot of good arguments for that but Upgrades are a lot more fun if not always best for a Daily Rider or real dependable Transportation.

If you go for slightly-higher performance, the cheapest and arguably best option is a quality Big-Bore setup. Italian brands like Malossi sold by RedEftPerformance or Polini by DayWot on eBay are the most reliable. The Laws of Unintended Consequences do apply, so almost nothing except stock parts is really "Bolt-On" but it sounds as though you have a clue and there's a lot of help here for the details.

If the piston is munched, you must plan on complete disassembly and case-splitting, with replacement of the crank bearings and careful scrutiny of the crank and con-rod. Otherwise you may have to do it over.

[parker05_05]

I don't need or want performance but if its the same price as stock why not. We have dirt bikes and quads to go fast. I got this little guy for $30 not running. Its in decent shape other than low compression. I just didn't know if there was any cheaper options. It woulnt be driven much. Just around the neighborhood a little.

[sleeperscoot]

If you don't need speed just replace the stock piston and replace the front pulley with a kelly pully and your in.

[parker05_05]

What's a kelly pully if ya don't mind? Im guessing it has to do with speed. I seen pro-x sells pistons in different sizes but they list for all aero 50's. From my understanding the engines changed every couple of years. So I'm not sure if that will work

[sleeperscoot]

This replaces the stock front pulley which you will gain more speed, also i may be able to get very rare malossi gears which will keep your aero stock yet do an easy 55mph, i will post more info in the buy & sell section.