Hi guys, my name is Sydney.

So I bought a 150cc big boy scooter and rode it for 3 months, not 1 problem except it was 2 slow. So yesterday I bought a performance exhaust and a bigger carburetor. Had it Installed today but I think there is a problem..... No increase in power or speed... In fact it feels slower. Also, at one stage it was stuttering down the road, sounded like it was 'missing' then backfired, idled erratically and then eventually rode OK again.
Am I correct in thinking that it is a carb/jets adjustment issue?

Thanks for reading,