"Ed":http://motors.shop.ebay.com/e-tsales/m.html?_nkw=&_armrs=1&_from=&_ipg= is your front sprocket man. I believe he has 9,10, and 11Z sprockets. I bought a 9T from him, and it's awesome.
"Goo Gone":http://theexpiredmeter.com/wp-content/uploads/2009/07/goo-gone.jpg should take care of any sticky shit.
Martin is right about the vent hole. The manual oil injector connected to that vent. I didn't cover mine after removing the oil injection system, but I prob should. Never had a problem with it.