Let me start by saying I’m not a bike guy. I’ve been building cars since I was 14, but I’ve never built a bike and I’m really just learning them since I picked this one up. It’s a 78 XS650. Yesterday I was on a ride and ran low on gas, when I switched the petcock to reserve it dumped fuel in the crank case and puked the fuel/oil mixture all over the place. Do I just have a petcock problem? They’re leaking around the base, so I was going to pull them off anyway, but shouldnreplacing then take care of this problem?