I would say that if you took it to someone that you would be looking about 100$ a carb if you have them off the motor. And if the didn't have to get any parts. Are you fairly handy? Can you take things apart and put them back together, right? It is allways best to have a manual to resort back to. Do all the spark plugs have good spark? And is the fuel good? I recomend using premium fuel and if you can find a gas station nearby that has fuel without ethenol ( good luck) that is a better choice. May check fuel lines and filter for clogage. There is not much to motors as long as compression, spark, and fuel are there then it should run.