First post but I’ve been on this site for years learning all about my 83 xs650. Have been working on my bike for a while now and it has had its times good and bad. After pulling it out for the winter it ran fine but then letting it sit another month it started having problems. The biggest one is when the bike is on the service stand it runs fine but a few seconds after it’s let down on the side stand it dies. Has a 2-1 exhaust with a silencer and backing in it. Velocity air intakes (going to go back to foam). New jets (pilot 30, main 140) new spark plugs. Would love to hear some ideas!