Ted-fxr-180

It is a 2 stroke mate fxr 180cc with drum brake

Hi i have a gilera runner fxr 180cc on a x reg and i have changed the exhaust and air filter to performance ones a technigas exhaust and a turbo air filter (cheap one £10) and my bike has gone slower at take off i have seen on most gileras with performance parts they have different engine cases also when i bought the air filter it said on ebay something about the main jet size being increased could any one please help me on what to do should i go back standard ??? Thanks