Hello sir.. I owned a honda hornet 160r.. And i am facing rpm issue..

Hello sir.. I owned a honda hornet 160r.. And i am facing rpm issue.... Rpm is going up automatically when my bike is in sunlight for 2 hr.. And while i am riding facing problem like acceleration is up and down.. I have already consult to mechanics but they aren't came with a solution... Can u help me with this plz

Need help or advice? Ask your question and get help from experts