I have some friends that own 3 Prarie 650's, and we all went riding in Arkansas for labor day weekend............the bikes ran very poorly with low power and extremely hard starting at times. Lots of times, the bikes didn't even want to idle. I'm not sure what elevation they're normally run at, but maximum elevation we rode at in AR was 1800'. Jetting crossed my mind, but shouldn't they be jetted for 0-3000'? They thought maybe bad gas, but drained it all and replaced it with high-octane from a reputable gas station chain. Any help is greatly appreciated. And on a side note, this is not to knock Kawasaki.........those prarie 650's are awesome.