Ok, heres the ifo (I have one also):

They are 0.049 engines designed to run on 0% Methanol.
They do not have a carburettor as such, they have no throttle control, it is merely start it and leave it till the fuel runs out.
They do not have a tuned pipe, they have a few holes at the top of the cylinder, this makes them very noisiy, much noisier than my 0.15 in my on-roader.
They heat up like crazy, this is because the un-burned oil and extra stuff that usually gets spurted out the stinger on a car gets spurted out the holes of the cylinder which covers the cylinder, effectively reducing cooling.