My 83 DR250 starts fine, pull choke, kick, and she's going. The problem is it pops a little while idling, and a lot of the time it idles up and down up and down. Never down to the point it dies tho. As long as you arnt trying to run WOT the bike also drives great to but both at an idle or in gear if you it the throttle hard it boggs down for a sec then raps on up. I have put in a new plug, and scrubbed the Carb the best I can. It probably set for 3 years with bad fuel... any suggestions are highly appreciated. Thank you.