[Karting] Formula TKM is a low-cost British based karting category raced at club and national championships around the UK. It uses 100cc/115cc 2-stroke TKM engines and drivers are restricted to the use of single type of tyre. A second class, called TKM 4-Stroke, run on performance oriented 200cc 4-stroke engines was introduced into the cate... Found on http://en.wikipedia.org/wiki/TKM_(Karting)