st50 engine, gasket between manifold and block?

hi there, should there be a gasket between manifold and block? i saw a bike on youtube that didn't have this gasket. also the gasket between the carb and manifold is about 1mm, i have seen thick ones, maybe 1cm thick, big pieces of rubber on youtube dirt bikes, why is this? thanks.

xpress wrote:hi there, should there be a gasket between manifold and block? i saw a bike on youtube that didn't have this gasket. also the gasket between the carb and manifold is about 1mm, i have seen thick ones, maybe 1cm thick, big pieces of rubber on youtube dirt bikes, why is this? thanks.

yes as far as I know there should be a gasket.
I think the thick ones on dirtbikes are called "Heat Spacers" ?

Both answers are correct.