if its jamed between the two gears and wont come you will maybe have to remove the clutch basket. there must be a reason for the spring coming of.just have a right look at the problem area.
it will be the top hat thats broken.will have to take the clutch cover assy of and you will find it in there.a common fault if you hit the gear lever hard with a rock.
2011 frame is much wider. you would at least need plastics,ex system,air box assy,+lots more.you use the original kick start,you only grind a bit out the lever to miss the frame. cheaper trading in your bike.
not much lube in wd40 good to use after you wash the bike.use chain lube after it,and leave it to soak .the time you go to a trial it wont fling of. using wd40 will only result in chain and sprokets,chain pad and chain guide wearing out quicker. you should get at least a year or more when lubed correctly.