I finally found a nice '02 XR650R that appears to have had very little use. It looks like new, starts easily, and sounds tight. Once it's warm, it idles and runs good in low and midrange RPMs but sounds like it's staving for gas at WOT and cuts outs/chops as I increase throttle. It's been sitting for months with Stabil and the gas did smell and look old so I dumped it and filled with fresh. I checked all fasteners after reading the "Pig Pen" lookout points (kick starter bolt WAS loose) then took it for 20 minute ride to run the old gas out of the carb and get the engine to running temperature. It ran a little better but was still cutting out when I give it more throttle. Am I correct to assume that the main jet is partially pluged from gum/varnish? Is there anything I can use to "chemically" clean out the carb? I've heard of Sea Foam but does something like this work? I do plan on uncorking it so I'll have new jets and needle once they come in but was just wondering if there is anything I can do, that is work while, while I wait on parts? Thanks for any help.