![]() But the new generation of four-strokes, like the F70, and comparable mid-range products from Suzuki, Honda and Mercury, are starting to match the out-of-the-hole performance of DI two-strokes. While four-strokes are generally quiet, clean and extremely fuel efficient, I’ve found they can be a bit sluggish, especially in a boat laden with gear and a couple of hefty fishos. Initial impressions were that it was a zippy yet refined performer. I first checked out the F70 at Yamaha’s HQ in Brisbane at its official launch last year. This gives it a weight advantage over its competitors in the 70-75hp class and also increases performance. Unlike other 16 valve engines, the F70 operates via by a single, not dual, overhead camshaft. But the F70 differs from the F60 via its a unique engine design. It shares the same displacement (996cc) and is only marginally heavier (10kg) than the F60. ![]() ![]() According to Yammie, the inline four cylinder F70 is an enhancement of the Japanese engine maker’s popular F60. YAMAHA’s newly released F70 four-stroke marks a further continuation in the evolution of light, powerful and fuel-efficient outboards. ![]()
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