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I have a tank urban racer 150cc and when it started getting warmer this year my bike would lose power and I could walk faster than it would go. I looked and looked on the internet for the cause. in the mornings it would ride fine 35-45 degress F. in the afternoon I would lose power after 5 mins riding 55-65 degree F. changed moter oil all my problems went away. it was something I should've done but was lazy. learned a lot from it. hope this helps somebody.