155z engine spluttering

[cookem37]

I have just put another piston and rings in my pit bike it lost compression I have got it started but it runs really rough I have double checked the timing and cleaned the carb a couple times but still spluttering and boggy and back firing

 

[AntNZ]

did you clock the rings properly, put the rings on in the right order?

 

[cookem37]

Tbh I didn’t know I would need to do so, I’ll look up how to correctly clock them and try that thanks

 

[AntNZ]

did you replace the cylinder wit a new one?, if not your old cylinder needs to be honed before
you can put new rings in and get them to seat properly.

 

[cookem37]

Have put new piston and rings I honed the bore done the timing and check valves New spark plug new ht lead and coil
Cleaned the carb again and still spluttering and popping. Would it be somthing to do with stator?