David Richford

Hey, So i am having issues when i rev up, it is drawing air from somewhere and i am unsure where from. It makes a popping noise whenever i rev up and the bike cuts out when it pops. It is drive-able the air problem as i can rev it to the max to skip the popping, but there is another issue that i cant get over 25mph and it wont go over 5000rpm. Just wondering if anyone has had the same issue and has fixed it? The air filter is fitted fine with no holes in it so it cant be drawing air from there, the bike is fuel injected so we have ruled out the carburettor, we have taken the exhaust off incase there was a hole in the exhaust and there is none that we can see and we tried turning the bike on with the exhaust off and it was loudly popping.