Originally Posted by stucksays
Have just sold my old RIB and am deciding between a couple of RIBS what I should buy. One particular 5.5 metre RIB has a 2003 Mercury 90 four stroke with carbs.
I have heard of several bad things about them like Carburettor problems, and blockages in the rubber Grommet at the top of the water tube, leading to expensive engine head removal in order to sort it.
Also is a very heavy engine for a 5.5 metre RIB. How does it affect the power to weight ratio and balance or handling of the RIB.
Love to hear some comments.
Had a BWM Deepsea 17 with this motor on the back. Engine was a little heavy, but in my opinion it helped the balance of my set-up over a Yam 80 2 stroke.
With the Yam I always felt it was way too easy to stuff in a following sea and would need to back right off as it just didn't give me the confidence I needed to make the wave in front.
The Mercury added more weight to the stern and that helped keep the nose up and thus gave more confidence.
I also had to have the transom looked at. Some cracks appeared around the knees. Turned out to be just the gell coat cracking as there was obviously a little more flex due to weight and increased HP. As the fiberglass had to be ground back for inspection I did however beef up the transom a little, just to be on the safe side.
I had some problems with the engine later on that made me regret purchasing it over the Yam. I should have kept hold of my cash and put it towards the new RIB that I evenually bought.