hello i bought a bike its a 1984 honda ascot vt500 and when i start it and i let it idle till it warms up i try to gas it and it bogs down when its idleing i used a timeing light the back cilynder says its close to 1000 rpms and the front cylender it shows like 2000 rpm then when u gas it bogs down then picks up i went threw the carbs on it nothing is cloged in it i cleaned it would that be the ingnition timeing please help me out