skidoorules_98 Posted April 10, 2010 Anybody know what the base temperature is for the stock jetting is on a 2008 YZ250F? Rougly what altitude? Share this post Link to post Share on other sites
Charlie755 Posted April 10, 2010 I would assume close to sea level and 60-70 degrees as I run pretty close to stock jetting here in Western Wa and am at about sea level. I just drop the stock #70 leak jet to a #40 to give the carb a bit more squirt on the accelerator pump circuit and do the o-ring mod. Bikes run great. 👍 Share this post Link to post Share on other sites
skidoorules_98 Posted April 10, 2010 OT but whats the o-ring mod. Sorry just got the bike and starting to learn all about it! Share this post Link to post Share on other sites
Charlie755 Posted April 10, 2010 OT but whats the o-ring mod. Sorry just got the bike and starting to learn all about it! Look at the "stickys" at the top of this forum. It will give you detailed instructions on how to do it with pics. 👍 Share this post Link to post Share on other sites
skidoorules_98 Posted April 10, 2010 ok call me dumb but I don't see the o-ring mod in the sticky's. All I see is the FAQ's, peep's jetting for certain areas, which bike should I get, a stolen bike and who has the nicest bike sticky? Share this post Link to post Share on other sites
Charlie755 Posted April 11, 2010 Nope your not dumb. Here is a link with pics. Chokey does a really good job on the YZF's he has a lot of good advice. https://thumpertalk.com/forum/showthread.php?t=624773#post6157233 Share this post Link to post Share on other sites
