loosing power

[Patrick Sprague]

KLRiders, I rode my A13 out to VMD at MidOhio this past weekend. Beautiful weather, this event is like Christmas in July for a rider. The bike ran great out to Ohio; retrospectively it was 54 deg F when I left here at 5 AM and 84 F when I arrived at 5 PM. Bike ran fine while at the event. After leaving Ohio at 8 AM today the bike ran fine until just after noon, then it was acting like going on reserve, with only 65 miles on the tank. I stopped and filled up, the bike ran fine but started the same missing, like starved for gas after 15 to 20 miles into the ride. Stopped and checked the vent tube, it was open. NO vacuum sound when I open the tank cap, but I left it the cap just open and rode again. Same symptoms after 15 to 20 miles, with a popping on a trailing throttle like it was running very lean. Once I got into the WV mountains the bike ran fine, though the air temps had cooled a bit. Stopped at Petersburg, WV and filled the tank. It was hot there, about 92 deg F. After exactly 14 miles into the tank the loss of power/ starved for gas symptoms began. This time I turned to cross another mountain, the air temp dropped to upper 70s and the bike ran fine all the way home. I use regular gas and a K&N air filter, and got 48 to 54 mpg today. It seems that this problem is air temperature related: Below 88 deg F, bike runs great, above that gas is not getting to the cylinder. How can I make this bike work above 90 deg F? Carby problem, vacuum line??? Any ideas will be much appreciated. Sorry if this was recently discussed, I have been of list and riding. Thanks, Pat Rileyville, VA 94 ZG1000 COG 1887 99 KLR 650 FSSNOC 3610 88 R100GS BMWMOA 71601, ABC 1619 76 GL1000 CWC 295 AMA LIFE MSF INSTRUCTOR