"About $250 seems to be the going rate for used Alfano's which will tell you at a minimum temp, RPM and lap times. It will store these in memory and you can transfer the data to a computer for analysis if you really want. Some Alfano's will…"
"Head temperature will give you an indication of the carburetta tune. In a J you probably should be under 200 deg C.Would need to find some old data to check what we actually ran.
Almost any second had laptimer is likely to have a temp sensor…"
"I would say 16:1 and a caster / synthetic caster based oil. Not sure if Shell M is still available, but that or Maxima 927.
For the lap timer, you want a magnetic pick up for lap times and a head temp sensor that mounts under the spark…"
"20:1 we used to use motul 2t from a motorbike shop there is no kart shops near us. Go the mychron 4 cheap but still good.with our j I treated it like a lawnmower it won't die just keeps on reving.you will get plenty of practise out of it then…"