Fuel Leakage Problem

[tvrla]

I'd remove the carb and take a very good look at the seat. Perhaps the seat can be cleaned up. One idea that comes to mind is gluing some fine sandpaper to the end of a dowel, chucking it in the drill (or drill press) and carefully smooth out any roughness.

[Graeme]

I'd remove the carb and take a very good look at the seat. Perhaps the seat can be cleaned up. One idea that comes to mind is gluing some fine sandpaper to the end of a dowel, chucking it in the drill (or drill press) and carefully smooth out any roughness.

OK, Thanks. I'll try that.

[Graeme]

So, I guess it's the seat where the needle sits. My manual (Haynes) isn't particularly clear on that area.

It wouldn't be. The valve seat is not commonly replaced nor is it an easy job being an interference fit in the carb body. If it doesn't seal easily with a new needle maybe there is some damage to the seat that can be polished out.

If you really have to replace the seat I think one method  of removal is to drill and tap the seat so you can construct a little slide hammer to extract it.

 

Thanks Barry. (I missed your contribution on the page turnover)

[Graeme]

Well, to end this thread at the risk of becoming boring, I pulled the carb off again & inspected it more closely. There was a piece of rubber, a pairing (or paring) it seemed from the fuel line that had worked its way to the seat preventing the needle from sealing. I sucked it out & spat it upon the ground, stomping on it several times.

It wasn't small relative to the diameter of the seat or tubes so it may have been in situ for years before working its way downwards.

Anyway, that solved that one. The positive is that during the stuffing around I found that the spark plug lead had fatuiged at the attachment to the NSK fitting due to it being too tight. That was going to cause the next issue so I replaced it.

Thanks for for the interest.