Hammer Performance, everything you need here http://www.hammerperf.com/sportster.shtml

 

Great advice!

John

 

There are lots of ways to upgrade an 883. H-D sell several kits to do this, with different prices and degrees of mods, also there are several aftermarket companies, who I'm not going to attempt to list. Take a look around this Sporty section and you will find the most popular brand is Hammer, as suggested above, there are even illustrated threads on doing the build. Their basic upgrade today is to 1275cc, which with your stock 883 heads will give a great increase in performance, partly through the bigger capacity, but helped a lot by a boost in CR. Check out their website, but get yourself a long drink first!

 

The absolute simplest way is a set of pistons, cylinders, and gasket kit. Reverse dome conversion pistons (many makers you could get in Colombia), cylinders that match that bore, and the proper gaskets for replacing them.