A yes I have used n still use the Carbon Tech,carbon fiber reeds#133HT Better top end ,they are called . You can can get either more bottom , or more top. The reeds made a difference and have had them in on my 92 cr250 for about 5 years and they are perfect still. no chips no burrs spilts,throttle responce was ON IT compared to stock reeds .oh and you dont need to use the reed stops any more either its all in the instructions,that come with the reeds. ride safe ELSI_45.