PaxiMoon
regular
Reged: 11/07/2005
Posts: 154
Loc: Solent
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I have been offered a 3HP Yamaha Malta OBM, however the owner is saying he doesnt know where the cooling water exits the engine.
The engine looks very clean, however if it isnt cooling properly then it is not worth buying. Does anyone have a Malta and confirm where the cooling water exits the engine and the rate of flow?
TIA
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aka Richard
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lw395
regular
Reged: 16/05/2007
Posts: 610
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There is a tell-tale on the back of the leg. Most of the water goes through the exhaust.
Can find a home for it if you don't want it!
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lydiamight
regular
Reged: 09/02/2004
Posts: 269
Loc: North West Kent
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Depends on the model. Later models had a "tell tail" of water that exited in a continuous stream from under the rear of the power head. Earlier models (like mine) had a barely visible "stutter" from about half way down the leg--the bulk exiting through the exhaust. Best thing to do is fill a wheelie bin two thirds full with water and clamp the engine to the edge. Run in gear at around half to two thirds throttle for a goodly period of time and see if it overheats. Reccomendation is for a 100 to 1 two stroke mix which I personally think is a bit on the lean side.
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davidfox
regular
Reged: 12/01/2004
Posts: 607
Loc: East of England
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On the same note, I have a Malta that I inherited with the boat and only used once as it is quite heavy (compared to my Honda) the tell tail is intermittant and I am not sure it is working/cooling, does the engine have an impeller and where is it?
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VicS
regular
Reged: 13/07/2002
Posts: 8917
Loc: Home: Kent. Boat: Chichester
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The water pump is almost certainly located on the top of the gear case unit so you will have to separate that from the leg. You will need to know how to disconnect the shift rod if that's necessary and of any other pit falls there may be. A manual would be sensible.
In a few small engines with a fixed drive ie no clutch or gears the water pump is sometimes located behind the prop.
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Old Chemists never die, they just fail to react
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jimg
regular
Reged: 30/05/2001
Posts: 1273
Loc: Dartmouth
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If you don't mind me asking, how much are they worth? Only ask as you have reminded me I have one sat here not being used and maybe I should sell mine as well!
Cheers
JimG
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gaz22
regular
Reged: 03/07/2008
Posts: 12
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Theres one for sale near me approx 4 years old wanting £175 its been for sale for a few weeks with no takers
Hope this helps
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From the only Kingdom
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sparkie
regular
Reged: 15/10/2002
Posts: 234
Loc: Me: Chester. Boat: west Wales
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Good little engine. The earlier ones (like mine) didn't have a tell-tale. When I bought mine I suspected the impeller was shot, and so it was. The previous owner had never noticed as he only used it for 5mins at a time. I contacted PBO (Dick Everett) who kindly got in touch with Yamaha. They confirmed the situation and stated that several owners had drilled a hole in the base of the water jacket to provide a tell-tale. This I duly did, and it has worked well ever since. Easy to do as the position is not critical, just remove the power head from the base and all will be revealed.
Good luck
Sparkie
PS paid £150 for mine about 8 years ago.
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