Best trail riding exhaust

I think I'm going to look into that shearer. What's with this timing advance? I'd like to do motor work. Whats with this timing advance?

I don't really want to do a 240 or anything like that but I would tune on it a little.
 
well, running the right pipe and getting the right p&p w/ headwork and getting your timing and jetting exact are the best ways to maximize the juice out of your stock cylinder.
if you look in the diy section you'll find a how to on advancing your timing. basically, you're making your spark plug ignite just a smurf hair sooner in the stroke. this makes for stronger mid range power and a little bit better bottom end. it's pretty easy to do, you just need a flywheel puller and it helps if you've got a flywheel/clutch holder tool.