There will accumulate a certain amount of carbon deposits after your motorcycle worked for several period, and this will effect the normal works of your motorcycle if you do nothing with cleaning. The carbon deposits will cause the raise in compression, then the phenomenon of early spontaneous combustion and deflagration will happen. As a result, your engine may not work normally and the exhaust will calculate lots of carbon. Meanwhile, you will find your engine power decrease and your comsuption will be higher than usual. The best way to improve this condition is cleaning the carbon in time.