I mounted a used TAV30 to my Baja warrior and its topping out at 37mph(GPS). It seems everyone else is getting around 44 to 50 mph with these things, is there something wrong with my setup? The TAV and belt are used but everything appears to be in good condition. I've removed the governor and added a billet rod, 18# springs and advanced the timing 6 degrees. So what am I missing? Is my engine just not getting a high enough RPM or is the belt worn and slipping or is it something else?