My brother has an old 4.95m Ally Craft centre console which was originally powered with a Johnson 70hp two stroke. He upgraded it to the Yamaha 85 hp CV motor. It is so much better with the Yammie. Heaps more power and hardly any more fuel and has been brilliantly reliable and simple to maintain. Yes, you do have to pour some oil into the fuel tank. Big deal!!!
reading the link, my faith in VRO's has been restored enought to reconsider them if i do an upgrade, iv'e always been biased towards OMC, but wouldn't hesitate to choose a merc or yami.
yes, the 70 is more than adequate and is a good match, especially fuel use, just sometimes feel the need for a better top speed(50kph), when the conditions are right, you want to be ken warby and break a record
I would have thought you'd get a little better than 50 KPH with a 70HP eric.
As a comparison I used to get 50 KPH with a 70HP on my 5.2M Seafarer Viking and that improved to 65 KPH by going up to 90 HP.
Both speeds were measured with GPS.
i also used a gps. the prop(13 1/4 x 17) is a little rough around the edges, but not undersize or out of shape, and spins the engine to 5400rpm. i spoke with solas about a new prop, and they said the size was ok as the engine has a 5500 max. but a yamaha dealer said i can safely take the engine up to 6000? the boat is not weighed down with any extra'sOriginally Posted by Fed
The 2stk 70 Yamaha has a Displacement 0f 849 cc (Gear Ratio 2.33 : 1) RPM5000-5500 Weight 105 kg
The 90 is a 1140 cc (Gear Ratio 2.00 : 1) RPM5000-5500 Weight 123 kg ?
So there is a bit of a difference
i'd be interested to speak with anyone that has a 5m quintrex millenium with either a 70 yamaha or a 90 for some comparisons
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