I'm assuming that your talking about the coolant elbows for your leeks. Those are very prone to leaking. There is an o-ring under each elbow that you need to replace. When you remove them, it will look like it was a gasket but its just a really squashed o-ring. Some older 1100's developed a crack in the elbows themselves so many people will recommend you change those too. Mine were not cracked on my '98 so just changing the o-rings fixed my leaks. I also had some leakage under the thermostat housing as well so you might take a glance there too. I've never flushed an engine but I think I would change the oil and filter with cheap Dino oil then run the engine awhile then change them again using the good stuff. This should clean out lots of goop. Somebody will probably chime in with a better approach. Don't forget to order new carb boots and flush your brakes and clutch.