I hate posting this on urgent cause i'm not sittin on the side of the road, but i need your help/suggestions. My bike has been backfiring "under load". usually in 5th gear about 65-75, when i give it throttle, she coughs and backfires. also seems to vibrate more than normal under those conditions. i took it for a ride this evening and i pushed the choke knob in...pulled it out just a tad then shoved it back in to make sure it was all the way in. it seemed to run a lil better. i'm wondering if my choke could be out just a tad. not to throw anyone off, could be something totally different.