guys im a newbie in using my 135lc...i got this bike about in the month of march...i tested this bike and its running 160kmph....im satisfied...then one day...i tested my bike again and it cant even run to 140kmph...only 120-130kmph...i've changed my the lubricating oil..changed the spark plug, everything i did wasn't a help...do u think it have something to do with the carburetor or something...please i need advice guys