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Old 06 September 2013, 12:32   #1
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Yamaha 5A Help

Hi Guys, just bought this used 5A Yamaha air cooled motor and searching for a little help to get the engine running ( aswell as removing broken bolts !! )

The engine has been sat and unused for over a year, but have been promised that the engine runs fine.
The only issue it has iv found is that the fuel bulb is loose in it's housing.
Please see photos attached.

The bulb is solid plastic - just a visual aid to show that fuel is getting to the carb ? however fuel leaks from this housing, and after inspecting i have noticed that the mating surface of the bulb isn't exactly flush and level and isn't sealing fully against the housing with the rubber seal.

The photo shows the bulb surface, is this supposed to be perfectly flat ? if so, how can i repair this to prevent it leaking ?

The aluminium plate also does not press against the bulb to hold it secure, and so the bulb moves around.
Not sure if there is another seal missing or ??

1 last question, does the carb and float chamber ( part with the nipples ? ) look to be in order and able to run ? not sure if there are any tubes or lines missing from those nipples
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Old 11 September 2013, 08:58   #2
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Hi guys, is the fuel bulb supposed to be shaped this way or should the mating surface be perfectly flat to seal onto the rubber washer ? Not sure if the plastic bulb has been melted a little ?
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Old 11 September 2013, 11:11   #3
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Blank it off, Its only a visual aid as you say to see if there is fuel in the bowl, the nipple will almost certainly be a carb drain. Well over engineered powerful little engines
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Old 11 September 2013, 12:31   #4
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Hi Steve ! there is also a spring inside that is held in place by the bulb, i assume the spring is to allow the carb drain plunger ( the black button on the right? ) to return back into position, just figuring how to blank the hole off but still keep the spring in place....
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