Why is my scooter making a bapping sound when running?

by Chris
(West Milford, NJ)

Hi, it almost sounds like my scooter is making a bapping sound, or sounds like an exhaust leak, but there definitely isn't one, one day I started it right up and just went, didn't let it warm at all, so after that, is when I started to hear this sound, this thing is like brand new... please help.

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Jul 17, 2011
Best Guess

Is it a bap bap bap or bap ba bap ba bap or is it really a bap ping bap ping sound; because if it's really a bap ping bap ping, you've got some serious trouble! Just joking; to my best guess, based on the limitted info you gave, sounds like a fuel system related problem. If the scooter runs ok other than the annoying sound, and you're sure it won't damage it to be run, drive it down to a low tank and refill with fresh gas, or just top up the tank you have. If that doesn't work, check your carb float bowl for contamination; don't drain the float bowl; remove it carefully so the contents don't spill, and then examine the full bowl for contaminants before you empty it. If there are contaminants then clean the float bowl make sure the jets and circuits are clear beforeyou replace the carb; then change your fuel filter making sure the flow arrow is pointing in direction of flow.

The other thing that comes to mind is a sticking valve; make sure your oil level is correct; if it is low that is reason to suspect a sticking valve. If you suspect a sticking valve, sometimes just topping up the oil can fix it, if that doesn't sometimes adding an oil additive will help, but you may have to disassemble the valve train if not; get a Haynes Chinese Scooter Manual for about $30.00 online. Before you do this wait for other members advice; I'm giving this advice off the cuff from a coffee shop; could be something more obvious that is just not coming to mind right now. Good luck.

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