125-200cc Yes a 165 works on mx track

After riding 165 on track for about month now an loving it .I got to spend time on bigger track that I would say was a four stroke track lots jumps close on exit to corners. This thing rocks I found what I thought was good suspension poor .I am going so much faster now with less effort an I reach limit of suspension .yes the high rpm is not there but not bad but the bottom an mid pulls !! Maybe try diff pipe but this works . Mine might be diff than some I have Fbf cylinders to start with an compression is 217 so it's race gas only . Thanks Walt An by way I have one of nicest 2002 cr250 in garage low low hrs that's for sale now after I built 165 .

thats great how big are you. i have a 02 cr 250 that i race motocross and off road but iam thinking of a 165 iweight 215 will it pull me. call me about your 250 bill 580 768 9599.

Mine works for me on a track too -
what pipe are you using ?