I know this is the YZ forum and it will be bias. I have a 1999 KX 250 that is a nice bike I never get attached to the bikes I rebuild and get bored quickly after I have them in good order. I have a guy that is willing to trade me a 2003 YZ 125 that seems to be in very good condition both cosmetically and mechanically as my 99. I am debating as to whether this is a a good deal for both of us. I like the power of the 250s but honestly no more than I get to ride the 250 may be the death of me. The last YZ 125 I owned was a 2001 and it was a fun bike...nimble and quick. I read the 02/03 was a 5 speed and I was wondering if this hurt these bikes?.....or if say a 01 trans would transplant into the 03 cases?