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I know this thread is specific to Yamaha and a thread search didn't find any references to Scarab, but in case someone owning a Scarab is concerned then don't be. Scarab uses a self contained closed loop engine cooling system with anti-freeze. On many many occasions I have dragged the sandy bottom and had to power through to get back into sucking clean water. I have never had an engine cooling system filled with sand nor an engine overheating issue. I have many complaints about Scarab boats/trailers but cooling is not one of them.
Yes you are correct. For some reason I was only thinking about the internal engine cooling. The exhaust system is cooled via an intake with raw water. Surprisingly I have never had an issue with sand in the exhaust. Boating in the “skinny” waters of southwest Florida I know I have pumped sand through the exhaust. Since I boat in salt water I do flush the exhaust water system afterwards.
Yes you are correct. For some reason I was only thinking about the internal engine cooling. The exhaust system is cooled via an intake with raw water. Surprisingly I have never had an issue with sand in the exhaust. Boating in the “skinny” waters of southwest Florida I know I have pumped sand through the exhaust. Since I boat in salt water I do flush the exhaust water system afterwards.