I have this Yamaha RX 100 (1996), which i bought few months back. But problems started to develop recently after having serviced it with a local mechanic . When i bough the bike, it was giving me good mileage of 30+ km/Ltr and the smoke level was normal for an RX. After the day i serviced the bike i road it for an hour or so, crossed 80 once. Suddenly the engine started to die and later i realized the engine was started without checking whether the oil pump is pumping oil in the carb! so i went to another mech and make it sure the oil pump is providing oil to the curb. After that everything seemed fine for a while. But i started to notice the mileage has dropped to 20 km/L and more than usual smoke is coming out of the silencer, and recently fuel is coming out of the carbu's overflow pipe often, when engine is off but the carburatore's fuel key is on. Some info regarding my bike: spark plug's color closely matches the one with a healthy 2 stork spark plugs, which is brown. Top speed at different gears are as follows: 1st - 20, 2nd - 40, 3rd - 70, 4th - 100+ km/h. Carburatore make is Mikcarb made in India. Piston barrel is a G3. What's there for me to do at this point, i want to change the Carb with the 135's carb. is that OK? and how will i recognize if i'm getting a genuine carb from Yamaha?
Pardon my English guys.