I,m including my 06 CR125 also, stock except for a PC silencer and a Rad Valve which I took apart and polished the internals, stock gearing, 110 leaded fuel, and an icat they work on the CR125 pretty good. I hit the closest local track today,because of servere storms in the area. My mod bike would over power the track hard pack with loose powder on top, steep hils with deep rain ruts. The 06 CR125 is fun to ride, the rad valve and icat, make it run better, snappier,2nd gear corners it carries the front wheel, ,seatbounce a little hill, in the air click 3RD pin it wide open, just touch ground and there,s a step up. There was no bikes on the track,everyone says it,s to full of rain ruts,I really like the 06 fun, handling is awesome, very reliable,etc. I forgot I put stiffer fork and shock springs in, added a couple seringes of oil in the forks,and polished the cartridge rod. On lap 2 my back popped off a small double,still laying on ice. A servere storm came threw 100 ft. trees where bent over, I grabbed my bike and got it next to my van, next I was ready to run to the equipment for cover, I thought my G-20 Chevy van was going over. A twister took a friends house down and the old school house that the track owned down.