Hi and welcome Rolf and fsartono.
As Rolf said there are a bunch of drivers that come from Singapore to race in Malaysia - the "Rolf" group is actually 3 drivers that make the trip over to all the races.
Rolf covered quite a bit very well....
For initial investment you're looking at anywhere from SGD 2,500 for a cheap used kart+engine up to around SGD10,000 for a brand new expensive chassis and brand new Rotax engine. You should be able to find a good used package for around ~4000, you should buy an engine that's originally been bought in Malaysia - and if they have the log-book or Rotax "passport" with it that's a good thing.
Other than the kart you need safety gear which all up on the cheap comes at around SGD 1000 but depends on what you buy, the helmet alone can be over 1000.
Then you need some basic tools if you want to work on the kart yourself.
Like Rolf said SMSA for the license:
http://www.smsa.org.sg/ they have entry forms there.
Quote:
a couple of friends and I are interested in racing in the Rotax league
One option you have when you get started is to buy maybe just the 1 kart (say if it's 2-3 of you), and practice on that and then maybe do the first races with 1 guy driving and the other(s) as mechanic(s) - this way you can learn together at the start before you start beating each other on the track.
