I must confess i dont know a great deal about jet units, but from people that i have spoken to about them all say that Hamilton ones are the ones to go for- A friend of mine has just fitted one to his 4t boat powered by a Yanmar 370-500 HP, should go well when it gets on the water. The RNLI are using Hamilton jets in their experimental boat and more than likely to be used in the operational boat when its out.
They can take some serious abuse.
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