My Cr125 is bored to 144 and it had a 360 jet in it and it was bogging out really bad...then i changed to 350 still did it, then to 340 still did it...it usually has to be started with teh choke up thats why im assuming it has to be a carb problem...once it starts with the choke up i put it right down it usually idles okay but sometimes dies out...the main thing is when its idleing and then i just twist the throttle all the way and hold it the bike will bogg out and die...and when im riding and hit the throttle it will go "burrrrrrooooopee" and then i let go and gradually hit the gas and it runs okay any suggestions