Shindy94 Posted November 10, 2015 I have a Yamaha wr250f when I bought it it was running mint just needed shims doing and a new throttle housing, so got them done and few others like a service, ect. Now it Boggs when opened up I've got new plug it run fine for about 15 min them back to the same cleaned carb and jets and done the same thing does anyone know any other reasons why this could be happening? Share this post Link to post Share on other sites
andris231 My Ride Posted November 12, 2015 Check the timing chain, maybe its old and loose, and timing is out a little bit. Also you can appy O-ring mod to carb. Share this post Link to post Share on other sites
