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    1979 7.5hp Thunderbolt Impeller not sitting properly.

    Last year I had my 1979 7.5hp Thunderbolt serviced and a new impeller fitted. Whilst motoring on a river the engine began to overheat with no tell-tale after about 10 minutes due to "an unforseen" blockage which I have now found in the powerhead end of the copper tube which runs from the water...
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