Bought a 03 1100 VTwin that was not running. Pulled carbs cleaned and reinstalled. Ran but was way to rich. Checked jets and found someone had put way to big of jets in it. Took Carbs to MC shop. Bought jets they recomended due to type of pipes on bike. Was better but still way to rich. Plugs last about 30 min before fouling out. And by fouling out I mean charcoal black both cylinders. Changed out jets again to factory jets. Same results so I went another step down on main jet. Runs for 30 miles and turns the plugs into charcoal. Took it to MC shop they went through carbs adjusted float level, fixed exhaust leak and said it was good. Drove it home and around town and sure enough at 31 miles the pluges fouled out. The thing runs perfect before the plugs foul out. Makes no sense. Cannot figure out were the extra gas is coming from. I even went as far as to plug the choke holes to verify the choke injector wasnt leaking by. Got the same results. Its back at the shop now driving them crazy. Just wondering if anyone has ever heard anything like this? Thanks for any advice you may have.