Today I spent some of my time in the shop scraping the head for a Suzuki DT 20 outboard motor. It had a blown head gasket, a bad water pump, a cracked tiller arm, and a was in need of a general clean up/ tune up.
The water pump impeller is an easy fix, just take four bolts out and replace the impeller. I found another old motor to take the tiller arm off, just two bolts and the two throttle cables. But, the old gaskets on the head and water jacket are very stubborn. I think when the motor over heated (from the frozen water pump) the gaskets got cooked into a rock hard state. I may end up flat filing it and then sanding the gasket surface on a large flat plate?
C.O.