gy6 150cc with performance exhaust back fires
 

I have just got my first gy6 150cc scooter I have had many scooters in the past but this is my first chinese scooter.

When I bought the bike it had a cadillac converter in the exhaust so I removed the stock exhaust and put a free flowing performance exhaust on it along with a perfermance cdi box and coil.

The engine back fires sometimes when I let off the throttle a friend of mine told me it sounds like it is sucking in air form some where.

I removed the exhaust and where the exhaust bolts to the cylinder head used some exhaust sealent I'm waiting to see if that fixes the problem.

I'm not sure what else I can do if that is not the problem.

the acv on the carb richens the mix on decel. Have you done any other mods?

John

have you changed the main jet

no other mods besides the exhaust I plan on doing some transmission mods but right now it is the exhaust then go from there I have not changed the main jet yet.

I know main jets are different from place to place so are there any main jet kits for these bikes?

I get all my stuff from scrappy dog scooters.good people over there

check the acv.

John

I made a baffle that I put between where the header pipe and the muffler join witch seems to be working perfect and I have got more power on take off.

I have a new problem now my battery went dead on me a couple times so I charged the battery and put my volt meter on it and it is not always charging at 13volts it will drop down to 8 volts or lower then back to 13volts what can cause this to happen?

what is happening when it drops to 8volts?

John