Ok On my bike i think theres definetly a problem with the carburator what happens is the mototr will not start unless i hold down the primer button while peddling then the engine fires up but engine power kinda sucks also it will not idle at all it shuts down when i engage the cluth to idle when stopped also also i just lost the idle screw but this was happing before that should i just say the **** with it and just replace the carburator? because it will only run when i hold down the primer button when i peddle after that then engine will run and the bike will go as long as i dont disengage the clutch to idle