Bought an old boat with 1990 115hp two stroke. Runs ok, a little touchy to start hot or cold. But it uses an extreme amount of fuel. I'm familiar with old two strokes using a lot of fuel but this is extreme. Less than an hours running at various low speeds, up to about 20 knots and less. Cruising around on a choppy day and used 8 gallons or 30 litres of fuel. Carburettors look clean and jets are clear. Any suggestions would be greatly appreciated.