I wouldn't half ass it, just have them replated. At $150 a jug it's a small price to pay to do the job correctly. Plus I'd be willing to bet your exhaust bridge is cracked. Grab a magnifying glass and have a look.

Hit me up if you decide to go that route though as Millenium sets them up too tight and you have to request the proper NSR clearances because they see it as a CR125 barrel.