We bought an 08 KLX 140L last night for my son as a biginner bike and when we got home we noticed that it fires right up but won't idle. We brought the bike from about 4500ft elevation to our elevation at about 2400 and are wondering if it may be a jetting issue. The us we bought it from also said it hasn't been ridden for about a year. Wondering also if it may be bad gas? Going to pull the carb off this morning and clean the bowl and also the air filter and see what's up. Bike also has a pipe on it. Any other ideas or what do you think might be the problem with this bike. Seems in great condition for the year. And the price was right. It's was raining super hard when we picked up so the owner basically fired it up and I said let's load it and get out of here. Hoping it's not a big deal.