I am wondering if anyone can shed light on an issue we are having with this particular bike. Basically, the bike starts fine cold and warms up and drives perfectly for about 15 minutes ( responsive to throttle, idles great) . But, after this time period the bike then seems to run lean and then will barely start. Any throttle applied after it falls into this condition stalls the engine. If you let the bike cool off, it will again be perfectly operational.
We took the carb completely apart and cleaned it. Everything looks good inside - floats look like they are working etc. We opened the gas lid to activate vacuum, no response. Can anyone throw some recommendations at us? I'd be happy to post a video of the the bike operating if needed. Thanks for any help.