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Old 19 March 2014, 17:42   #1
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Country: UK - England
Town: Whitehaven
Boat name: Pegasus
Make: Zodiac Pro 530
Length: 5m +
Engine: 115hp Merc 4st
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Help with New Engine for Zodiac Pro530

I had a chat with the workshop today and they advised my old Mariner 75 is going to need a re-bore if it is to be of any reliable use and at just under 30 years old, I'm not sure its worth it. So I find myself looking for a replacement engine.

The old Mariner ran ok, till it died, but was smokey, smelly and thirsty and I fancy something a lot newer, cleaner, quieter and more economical, oh and bigger.

I've looked at the second hand market and can't justify the cost for an engine of the right age with potentially unknown issues, when new ones are not that much more, so I'm thinking new is the way forward.

The issue I have is that the boat is old and although rated to 120hp, has no max transom load on it. As engines have got a lot heavier, I have no idea what is safe to hang on the back, particularly as I have a 25kg aux on there too. The best guess I have is the mariner 115 of that era was about 160kg. I can't find a contact for Zodiac either to ask them for advice, as they direct you to the dealer network.

I use the boat as a family toy, fishing boat and heavily loaded dive boat. The 75 was quick with just me in but struggled with divers. I'd like to go with a bigger engine but that puts the weight up even more. I also suspect 115hp might be a bit too much for the hull. To complicate it further, I'm planning on replacing the hull in a few years with something like an XS545 or 585. The 545 has a max hp of 100, which would suit the current hull, but means 4 stroke and heavier (honda 100 is 163kg). A 90 would be fine for the 530 and the 545, but possibly too small for a 585, although much lighter (90TLDi is 143kg)

So, after all that, what engines do any of you other 530 owners have? How do they handle (top speed, chine walking, quick on the plane etc.)?

Any thoughts on what weight I can safely hang on the back?

And finally, any thought on how well an XS 585 or similar would go on a 90 or 100 motor?

Based on weights, price, local dealers etc, if I go 90hp, then its the TLDi, 100 is probably the new honda (expensive but quite light and very nice!) and 115 would probably be an Opti or TLDI.

Thanks,

Phil
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Old 20 March 2014, 08:34   #2
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Country: UK - England
Town: Whitehaven
Boat name: Pegasus
Make: Zodiac Pro 530
Length: 5m +
Engine: 115hp Merc 4st
Join Date: Oct 2012
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Anybody?
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Old 20 March 2014, 09:55   #3
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Country: UK - England
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The workshop has been back on the phone. The old girl lives after all, so please ignore this thread.

Phil
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Old 26 March 2014, 10:09   #4
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Lucky you!
When have to replace in the future, dont't exceed the max.hp with this one!
Have seen a couple of them which complete ripped apart with overpower..
115 is a nice engine, but a 90 would do nice too..
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Old 26 March 2014, 11:50   #5
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For what it's worth, my 20 year old Humber Attaque was plated for 150hp

When I contacted Humber they said that the OP 5.3 which is basicaly the same boat, is now rated for a 90hp four stroke and a weight of 170kilos.

Dunno exactly what this means for you but might be of interest.

On the XS question: the RYA centre at cumbrae run XS600 (I think) with Yam 115s on which run fine 4+ up (the instructors use it for their commute over from Largs Marina). Also Doug Stormforce on here has his XS600 up for say with a 115 Merc 4st. That was a school boat so I would guess used to running 4 up at least. Dunno how the 600 hull differs from the 585 though.
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Old 10 July 2014, 13:32   #6
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Country: UK - England
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Engine: 115hp Merc 4st
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Thread resurrection time!

I've sold the old engine and am once again in the engine size dilemma. So, same questions again. What do people power their 530's with? I've narrowed my choices to a 90 tohatsu (light, well priced), honda 100 (light for a 100) or a 115 opti (light for a 115 and well priced). Suzi's, evinrude and yam all mean long drives for servicing (4hr min round trip) so are out of the picture.

Any thoughts, advice or experiences welcome!

Phil M
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Old 11 July 2014, 10:06   #7
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I had a Honda 90 on my Zodiac 530. It felt perfect for the boat. I usually had three people and I didn't feel like I needed more power. It planed quickly but the boat console/fuel tank was setup nicely and was balanced well. Theres a drone video of my 530 somewhere on ribnet.
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Old 12 July 2014, 13:20   #8
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I have a 75 ETEC on my pro 530. Personally I would love more power however the engines today are much heavier than when the boat was originally built in 1989. I have also rebuilt the entire boat including new stringers, underdeck 25 gallon fuel tank and a glassed
in a bow locker. When choosing a motor I found the specs from mercury/ mariner in 1989 . The 115 hp from 1989 weighs less than my 2011 75hp ETEC. Without totally reconstructing the entire transom I choose to stay lower on HP rather than over stress the boat. I also added Searider styled transom supports. The boat does 31 mph flat out with my wife and two kids on board. Good enough for a family boat for now.
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Old 15 July 2014, 08:12   #9
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Country: UK - England
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Boat name: Pegasus
Make: Zodiac Pro 530
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Engine: 115hp Merc 4st
Join Date: Oct 2012
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Thanks for the responses.

Weight is my main concern. I've done some digging through various threads and peoples signatures and have found the following 530 hull/engine combinations. I should also stress that my boat is the old style transom with the hollow returns on the outer edges. Sort of a /---\ shape, viewed from above and behind and may differ in load capacity than the newer design. Anyway, I've found the following engines have been used.

Evinrude 120 V4 - 166kg (365lb)
Twin mariner 60 clamshells - I guess about 90kg each so 180kg (396lb)
Mariner 75 clamshell - 127kg (280lb)
Merc 115 2st (1991) - 148kg (326lb)
Merc 115 4st (2001ish) - 176kg (386lb)
Honda 90 - 163kg (358lb) lightest since introduced.

Based on the above, I think I'm comfortable putting the honda 100 on
(as its the same weight as the 90) without overloading the transom. I don't have to use full throttle all of the time but it will give me a little more scope if I replace the hull. Just need to find the best price I can now.....

Phil M
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Old 11 January 2015, 14:45   #10
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Make: Zodiac Futura Mark 3
Length: 4m +
Engine: Honda 50HP
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Hi

What the top speed on youre 90?

I will like to buy a Zodiac Bayrunner 550 with a 90
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