Outlander 800 not always starting

2011 Outlander 800R XT has never given me any non-selfinflicted trouble till now. Always stored indoors, usually on battery tender Jr. sometimes I go to start it and the green button does nothing. battery is tip top shape so it’s not voltage. I hear the fuel pump so i don’t believe it’s that either.

Someone some where on here said something about cleaning the contacts because that’s what’s going on.

Where are these contacts? What contacts, lol?

Please help, thanks