I posted this problem in Honda 2-Stroke but maybe someone here can help... I just picked up an 02 CR 125 and noticed it had a flat spot in it. You have great response from closed to 1/4 throttle. You go from 1/4 to 1/2 or 3/4 and there is a flat spot that you have to feather the throttle to get through it. Once you get through it, it will put you in the power band and pull hard. My question is how do I fix it. So far I have taken the carb off and made sure it wa clean. Also I saw that the jets were not the correct ones. I have a Pro-Circuit Works headpipe and Pro-Circuit R304 Shorty silencer on it. It had #410 main, 35 pilot and needle clip in the middle. On Pro-Circuit's website it says it should have #390 main, 32.5 pilot, and needle clip in the middle, air screw 2 turns out. I changed the jest to Pro-Circuits specs. Also it has a new top end and new Boysen Reeds. I also tried changing the needle clip up and down and putting it in the second notch (richer) it runs a touch better than the middle but not alot, still have a flat spot. Next I am gonna check to see if I have an air leak around the reed valve. Is there anything else I can check or try to do to get rid of that flat spot? Should I mess with the air screw some more and try that? If anyone has any ideas please let me know. Also I am at an alttitude of around 2000ft. Also my needle jet is 6DFY5-74. On Pro-Circuit it calls for a 6DFY-74, are these needles the same ones? Thanks in advance to anyone with some answers. Also I assume the original owner used 32:1 pre-mix. I know he used Castor 927, just not sure on mixture. If anyone thinks of anything that could help, thanks in advance.