Yamaha Malta outboard

Badger

Badger

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I have got a Yamaha Malta 3hp Outboard which I bought in 2001. I used it between 2001 and 2004 with no problems and had it serviced professionaly each year. In 2004 I put it in dry / warm storage. It was not winterised and there was still fuel in the tank. I took it out of storage this year and took it for service. Does it sound reasonable that it would need a new carboretter as the old one is apparently not functioning depsite having been cleaned ? Or should it just have started !
 
I would say providing the bores are free of rust and the piston is free to move the most it will require is the jets cleaning, there is a good chance that they are gummed up and the fuel renewing,it should run
 
I'm surprised that it needs a new carb but funny things do happen with aluminium over 6 years. I suspect that the jet was blocked with old oil from the fuel and the cleaning to remove this may of opened up other problems. I had this type of problem with a Honda 30 a few years ago.
 
There is a tiny, inline fuel filter about the size of a 13 amp fuse, neither mentioned nor shown in either the owners or workshop manuals-it 'looks' as if it is part of the carb or fuel tank outlet ( cant remember now which end of the fuel line) but that is the place to start inspecting before stripping the carb down. I would have a look but I gave my Malta away and just like to row!
 
Cleaning a gummed up carb can be a labour of love. Little bits of the residue can stick in there. You can buy carb cleaner to soak the carb in. Did you use an airline? You really should.
 
Blueboatman said:
There is a tiny, inline fuel filter about the size of a 13 amp fuse, neither mentioned nor shown in either the owners or workshop manuals-it 'looks' as if it is part of the carb or fuel tank outlet ( cant remember now which end of the fuel line) but that is the place to start inspecting before stripping the carb down. I would have a look but I gave my Malta away and just like to row!
Click to expand...

It's in the fuel tap and I can't remember which end. I have a feeling that it means removing the tap.
 
My experience of Yamahas left to their own devices for a few years is that corrosion salts can completely block up the jet-ways so that even cleaning the jets does not solve the problem. Perhaps it is something to do with the aluminium alloy they use - I don't know the reason just the effect.

Some advocate stripping the carb down and boiling it in water but I have found that sometimes the problem is so acute that it is a question of either a new carb or picking out the little pressed in balls that seal the jet-way borings, drilling them out (carefully) to remove the corrosion, blowing them out, and then using a bit of plumber's solder wire or lead driven in place of the balls with a small ball-pein hammer to seal the jet-ways back up again. Then the carb can be re-assembled and will be like new again. It is important to blow out after this operation, Yamaha carbs in common with some others utilise tiny piercings for the slow-running jets. These are in the choke tube, the main part of the carb leading into the engine. They are not removable jets as such, just microscopic holes.
 
Badger said:
I have got a Yamaha Malta 3hp Outboard which I bought in 2001. I used it between 2001 and 2004 with no problems and had it serviced professionaly each year. In 2004 I put it in dry / warm storage. It was not winterised and there was still fuel in the tank. I took it out of storage this year and took it for service. Does it sound reasonable that it would need a new carboretter as the old one is apparently not functioning depsite having been cleaned ? Or should it just have started !
Click to expand...
I had a Honda BF2D - its carb air ways got blocked by old fuel. The airways were miniscule and inaccessible so the bullet was bit and I bought a replacement carb for £30.00.
 
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