My small engine mechanic says now i need a new carb. We replaced the fuel pump, coil, spark plug, fuel, it ran for a few days, then after sitting a few days will not stay running, he took the carb out, cleaned it, ran for a day then same thing and now will not run. The bike only has 1k miles on it. Also changed the fuel filter. Any ideas? Also where to get a carb? Thanks in advance