Hello all, ive tried the search option to no avail. If someone could shed some light on the different fueled engines that would be great. Im having a hard time keeping up with the terminology, gas isnt just gas its premix correct?Also the different sizes .40, 50cc etc etc... I have aTwist 60 and would like to know a good engine to look out for incase the one I have on it now takes a sh**...

I hope this is easier to explain that ive explained.

Thanks!