I have a 99yz400f. Bike has been giving me a problem \. During the last ride towards the end of the ride i notice a loss in power and it was popping . Since then i have cleaned the carb and got it running nice no popping. takes a few kicks to start. but still have a no power problem. i know its a four stroke but think of it ths way i have no powerband. Almost like its in limp mode only applys so much power. could this be a cdi issue?