How to avoid clogging your engine with sand

[Scottintexas]

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.

doesn't the scarab use raw water for the exhaust cooling ?

 

[Joatmon]

doesn't the scarab use raw water for the exhaust cooling ?

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.

 

[Julian]

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.

There have been examples of Scarabs overheating due to clogged cooling systems.
Both brands are susceptible to this.

https://jetboaters.net/threads/scarab-255-ho-impulse-resonator-melting.16758/