Lot of things you can do to save weight depending on how much $$$ you have and how radical you're willing to get:
http://www.thumpertalk.com/topic/590132 ... %20%20loss
http://www.thumpertalk.com/topic/847652 ... ry10609517
I wouldn't be the least bit comfortable drilling holes in the frame. Don't believe there is a way to convert to kick start. You could build up a 150 motor as high as 250 cc's to swap right in and have a kick start- and a 5 speed instead of 6. Aftermarket 230 exhaust won't get you much of anything for hp- better off spending it on other engine mods like a piston and cam for starters. But it will save you a few lbs.
Lighter mods on my own 230 consist of pro-taper bars, aluminum rear sprocket, and I think converting to a 250R rear wheel to get the disc brake saved me a few pounds, too. I'm mostly building it for power and suspension- if that happens to save me weight- so much the better. With lots more power, and a proper suspension, you don't have to care much if it's on the heavy side. I don't notice the weight once I'm moving, and it's inheritantly very nimble otherwise.
Getting rid of..say.. the kickstand and e-start would be pretty radical for me. That starts getting rid of some of the reasons I like the bike. But when the lead battery goes, I'll probably be up for a lithium battery and take off a few pounds up high.
Did you try to bump start your bike? I wouldn't sleep leaving my bike out on the trail.