Wilsons Sandbox

John, I had a similar problem a couple of months ago. As far as I can tell, it had something to do with the vent on the gas cap not venting correctly. I had just gone on reserve and it was near 100 degrees that day. My guess is that it built too much pressure in the tank and was not allowing the fuel to flow. Once I filled up the tank and rode the next day under similar conditions, there was no problem. Paul A13 Dallas, Tx "John Magee" wrote:

> > Have a '99 KLR 650 which has developed > a stumble at 3500-4500 rpm in any gear. Changed the plug and > cleaned/re-oiled the air filter...no difference. May be a little > sluggish above 4500 too. I'm thinking it's a fuel problem, but > wondered if anyone had any similar experiences or advice. > >

> The VFR, and other touring > and sport touring bikes, have a slot low in the winscreen that allows > a small amount of air in behind the shield. My assumption, and maybe > Chris Krok (the windtunnel guy) can verify this, is that the air > moving through this slot and up the back of the screen re-directs or > cancels the turbulence from the air spilling around the fairing. The > upshot was, the VFR was a lot more pleasant to ride, even with it's > lower windscreen.

Yeah, that sounds highly plausible. Speaking of which, I'm inches away from having that wind tunnel report on windscreens posted to the web. Hopefully it'll be done tomorrow. Sorry it's taken so long, I think the original interest in that topic arose about a month ago... Chris http://www.galcit.caltech.edu/~stingray/klrsharkfin.html -- Dr. J. Christopher Krok Project Engineer, Adaptive Wall Wind Tunnel Graduate Aeronautical Laboratories, California Institute of Technology MS 205-45 Phone: 626.395.4794 Pasadena, CA 91125 Fax: 626.449.2677