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Old 24 August 2010, 14:44   #11
abc
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Country: UK - England
Town: Gt Yarmouth
Boat name: No name
Make: Avon
Length: 5m +
Engine: OB 90 HP
Join Date: Apr 2009
Posts: 21
Merc 90HP Four Stroke

I had one of these (actually a 2000 Mariner but essentially the same engine) on a 5.6 Rib. An absolute disaster, the things weigh 177 kg which makes the power to weight awful. It was also disastrously unreliable, I only ever got about 25 hours out of it.

Our club also purchased a 2004 Mercury, the same engine but in Merc colours, for a 5.6 m Avon rib for diving. The engine was so heavy the rib was constantly flooding over the rear transom, in addition it was vey hard to get the boat to plane as the power weight ratio was terrible, and we tried numerous props! In the end we went back to using an old rib with a 90 HP Yamaha two stroke which performs marvellously.

For myself I eventually bit the bullet and put a 90HP Tohatsu TLDI on the boat. Result total transformation, floats 2 inches higher at the stern and has totally transformed the performance as well as being reliable and really economical. Hope this is of some use to you.

Quote:
Originally Posted by slimtim View Post
I'm thinking of getting one of these engines near me and have some questions as details are vague at best.

What weight is it?
Is it a dog, or is it ok?
Will it be efi or carb?
Is 3300 a good price? Sounds a bit pricey to me.

Any other info would be good.

Thanks, Tim
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Old 24 August 2010, 14:57   #12
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Country: UK - England
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Boat name: HotShot
Make: shakey
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Engine: 70hp Tohatsu
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Yes very useful thanks. I've decided to not pursue it for the reasons given in this thread, mainly the weight. I too am considering splashing out on a new 90 TLDI but at 6300 fitted from my local dealer, is it really worth it for a boat I don't get to use all that much?
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Old 24 August 2010, 15:23   #13
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Country: UK - England
Town: telford
Make: shakespeare
Length: 6m +
Engine: 150 optimax
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could you not find a decent yam 90? or is 2 stroke no use , what do you think of your shakey tim? i have very nearly finished mine
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Old 24 August 2010, 15:44   #14
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Country: UK - England
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Engine: 70hp Tohatsu
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carb 2 stroke is still an option, yams are way overpriced though. Ideally I would like something quieter and more fuel friendly hence the TLDI. Shakey is good, built like a tank and quick. Should fly with a 90 on it! Have you been building yours up yourself?
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Old 24 August 2010, 15:55   #15
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yes pretty much like you did yours, except i have used shakespeare console and seat pods, shakespeare or stevetheboat had a hull listed on ebay last year, i had it for a very good price and started from there, there is a few little bits left to do but i am hopeing to have it on the water this weekend
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Old 24 August 2010, 16:10   #16
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Country: UK - England
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Boat name: HotShot
Make: shakey
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Nice, good luck with the lauch! Put some weight in the bow locker (chain and anchor should be enough) or prepare for some exciting chine walking when at full tilt trimmed out
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Old 25 August 2010, 01:48   #17
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Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,803
Have you thought about sourcing one from the states?
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Old 25 August 2010, 03:32   #18
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100

I haven't come across the problem with this engine on the cooling system . I have had to pull the powerheads off to replace the yoke assy that arent very good but other than that they are and in my opinion good engines . I did have a problem once with a 100 carb model NOT pumping water properly and overheated all the time and the owner decided to remove the thermostat ( BAD THING TO DO ) and ran the engine for the whole season not knowing he was actually damaging the engine even though it was running great. And what happened was because the outboard ran tooooooooooooooooooooooo cold this engine staring to sweat and condensation started and this condensation is obviously water and this got into the engine oil and damaged the camshafts etc. RUST started to attack all these parts . A stat is there for a reason . And all it was in the end was a bad impeller housing even though he had replaced the impeller twice . A little story i thought i could share .
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