konyan wrote:Sve mi se cini da su ti motori apsolutno preslabi.
Ko zna, OCC je napravio chopper sa motorom od kosilice.
Evo jednog karting motora:
Vortex 125cc Engine
ENGINE TYPES: 2-CYCLE OR 4-CYCLE?
As you can imagine, the differentiations continue. You can now choose either to run in a 4-cycle class, or in a 2-cycle class. 2-cycle engines have been the most dominant and widely used karting engines around the world for decades. They provide a great power to weight ratio, are mechanically simple, and therefore ideal for the karting application. Most

Yamaha KT-100
A popular 2-cycle engine
serious international competition takes place with 2-cycle engines, either air-cooled and increasingly also water-cooled. Most shifter-karts typically are powered by 2-cycle engines.
Typically, the 2-cycle engines have just one cylinder and range in size from 100cc to 125 cc. Some of the 2-cycle engines used in karting can reach around 19,000 RPMs, produce up to 40 horse powers, and have a fantastic power to weight ratio. Some classes utilize even larger engines, with up to 250 cc displacement.

Briggs & Stratton Raptor
Example of a 4-cycle engine
4-cycle racing is particularly popular in some parts of the U.S. However, even in that country, the 2-cycles still outnumber the 4-cycle karts. One of the advantages of 4-cycle engines is that no messy oil-gasoline mixing needs to be performed. The engines also tend to run somewhat more quietly and tend to last longer. In some 4-cycle classes, Methanol is used, instead of ordinary gasoline.
Lately, 2-cycle engines have come increasingly under pressure for environmental reasons. The fact that the engine is lubricated via oil in the fuel, which then gets spit out through the exhaust, is really not very environmentally friendly. Therefore, even the largest international karting sanctioning body, the CIK (see the article about Karting sanctioning bodies), has begun to push for the removal of 2-cycle karting engines out of their competitions over the next few years. However, for the time being, 2-cycle racing is still alive and well.