Threebond 1184 liquid gasket
Threebond 1184 Liquid gasket is an excellent choice for sealing aluminum engine cases, and any gasket surfaces where you want to eliminate paper gaskets ( Timing cover, primary cover, etc...) 1184 is a gray color semidrying synthetic rubber that has a high sealing effect on surfaces with poor flatness and large clearance. It is resistant to oil, water, gas, and high and low temperatures.
Also sold as Hondabond and Yamabond, this popular sealant is used by lots of top manufacturers in the motorcycle world. TB1184 is a semi drying sealant, (if you are looking for a non setting sealant please see the Hylomar page), and it's grey color makes it blend in with aluminum engine cases.