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Message: [QUOTE="Dekester, post: 1194423, member: 74578"] Primary reduction ratio per Yamaha's website: YZ250 06-07 3.000 04-05 3.353 02-03 3.000 WR426f 02 2.952 I guess I answered my own question if the website info is to be trusted. I do not completely trust the website because it shows secondary ratio (sprockets) as 48/13 for the 2005 yz250. I thought all the 2000+ model yz250's came with a 50 back and 14 front as the stock setup. So I am still confused. OK. I must sound really neurotic. As I was typing, I just dug up my factory manuals for 2001, 2003, 2004, and 2005. They all say primary is 3.000 (63/21) and secondary is 50/14 (3.571). It looks to me as if the website is wrong. Does anyone have a factory manual for a 2002 wr426f (or other 100% positive answer) to verify the primary ratio? [/QUOTE]