There are three kits for sale that will fit my '78 Honda NC50 Express. Reviews have steered me away from the Athena kit due to too many listed cracked skirts. I'm not sure if it is poor metal or improper instillation by the owners? I'm down to the DR kit or the 70cc Polini cast iron kit. Either seem to work well with pros and cons for both. I plan on smoothing out the ports as needed. I will be using the original head as well. What have you used and have been happy with or would never use again if it was given to you? I do not plan to ride the bike for daily transportation,just to retrieve my mail at the bottom of my mountain. I need a little more get-up-and-go to climb my steep roads. I've got the Dellorto SHA 15.15 on the engine now and it runs like a champ. Thanks for your inputs.
The best thing for Cast Iron is Cooking, because it Holds so much Heat, Not ideal for a Motor. Be careful if ya go with the Plated bore if ya wanna scratch around the Ports, the Plating is generally "Flashed" over to Ports to some degree but if ya go past it the combustion gases will get under the plating and it will start to come off. Im surprised on your findings of the Athena product, they are known for high quality product, being a piston guru not to many ways to break the Skirts off a Piston.