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FLOAT VALVE REMOVAL

Frank mellin

Member
Joined
17 Dec 2016
Messages
96
my 2hp malta yamaha wont run.
Taken carburettor apart and float valve is stuck .
How do I remove the valve without damaging it.
Is it a push fit or is it screwed in to body.
(Please see pic)
Appreciate advice p;lease
 

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Jamie Dundee

Active member
Joined
24 Jul 2019
Messages
874
It’s slotted to accommodate a flat bladed screw driver. Use an appropriately sized screwdriver to remove it carefully.
 

Frank mellin

Member
Joined
17 Dec 2016
Messages
96
It’s slotted to accommodate a flat bladed screw driver. Use an appropriately sized screwdriver to remove it carefully.
WILL THAT REMOVE JUST THE PIN INSERT OR THE OUTER BRASS HOUSING AS WELL...IS IT THREADED.
THANKS FOR THE INFO
 

Frank mellin

Member
Joined
17 Dec 2016
Messages
96
Float valves are a floating fit.
Invert and tap on a hard surface.
Think Jamie is talking about main jet
the problem is that the valve is solid shut inside the brass casing.
Is there any way to extract as a unit before releasing.Is the casing screwed into the body or is it a push fit
 

Jamie Dundee

Active member
Joined
24 Jul 2019
Messages
874
Float valves are a floating fit.
Invert and tap on a hard surface.
Think Jamie is talking about main jet
My mistake, the photo seemed to be looking at the jet. If the float needle is stuck, as you say. Or hook it out with needle nose pliers.
 

Athomson

Well-known member
Joined
20 Sep 2020
Messages
1,583
How do I remove the valve without damaging it.
Youll need a new one anyway so no need to worry about damaging it. These aluminium valves are quite prone to corrosion. Wouldn't it have been better to make them from brass?
 

Frank mellin

Member
Joined
17 Dec 2016
Messages
96
That was a terrible photo :ROFLMAO:
managed to get needle free.
Still have a problem after cleaning.
No fuel getting to float chamber.
Have checked supply to carburettor and it is fine.
It seems to stop at the black box on the side of the carburettor where the fuel supply attaches to (see pics)
Have no idea what this is for so any information on its purpose and possible cause of the blockage would be appreciated.
 

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penfold

Well-known member
Joined
25 Aug 2003
Messages
4,239
Location
On the Clyde
That is a fuel pump; it may need a new diaphragms(35 and 37 on the diagram) or valves(39).
 

Frank mellin

Member
Joined
17 Dec 2016
Messages
96
That is a fuel pump; it may need a new diaphragms(35 and 37 on the diagram) or valves(39).
The diaphragms seem to be in tact but I guess they could still be faulty.
Must admit I am baffled as to how it works as a pump as it seems to have no moving parts.
Does it rely on the engine creating a vacuum
If so would only be able to check with engine running?
 

penfold

Well-known member
Joined
25 Aug 2003
Messages
4,239
Location
On the Clyde
They need to be quite flexible; if they've gone hard it's probably time for new ones. The valves need to be working too. The pump works via the crankcase pressure which fluctuates between vacuum and pressure, wobbling the diaphragms in and out.
 

Frank mellin

Member
Joined
17 Dec 2016
Messages
96
They need to be quite flexible; if they've gone hard it's probably time for new ones. The valves need to be working too. The pump works via the crankcase pressure which fluctuates between vacuum and pressure, wobbling the diaphragms in and out.
thank you for the explanation, much appreciated.
will get a overhaul kit if I can find one.
Dont seem to have much luck with my outboards, I guess the answer is dont buy old boat equipment unless you own a bank!
 

stelican

Well-known member
Joined
25 Nov 2004
Messages
2,100
Location
fareham hampshire
The float bowl appears to have a layer of varnish from evaporated fuel. Make sure you clean out the jets as these may be partially blocked
 
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