Common oversights?

[Moooools]

Yeah i thought that would be the case.

The floats are all plastic.
I had a thought about leaky floats but they never have petrol in them.
The valve is in the right way.
There is no O-ring the valve, the tip is rubber.

When I have just reassembled them I put a piece of tube on the fuel inlet and blow into it, then turn it up side down so the float valve closes and then try and blow in, but can't. SO I think it is sealing fine.

They only leak after they are rebuilt (after changing jets etc.) but if I leave them for a bit with fuel in them (but fuel turned off) they sort themselves out. They also sort themselves out sometimes if I shake them.

I think that the floats are hitting something and catching, but have no idea what.

My other theory is air being trapped at the top of the carb bowl preventing the float from rising. I am not sure about the merits of that though.

[all4A50s]

How are you getting on?

[Moooools]

Pretty god really.

I have exams coming up so the parents haven't been happy with me spending too much time in the garage, but because of the NCEA system the exams mean almost nothing to me. S I will have study leave to work on it all day.

It was pretty rideable. I managed to go for a few laps around the streets but the rocker gear cover is leaking oil under the seal. The previous owner of the engine rooted one of the cover screws and It won't stay down. I will take the engine out and tap those out to M8 bolts.

It could have still gone up a few jet sizes but the leaky carbs were pissing me off so I am replacing them with two FZR 250 carbs. They won't be quite on the right angle compared to the massive downdraft of the FZR, but they should be on a good enough angle to work.

I have done some of the nyloning using the stuff they making chopping boards out of (can't remember what it is called), and have some chopping boards to do the forks and mufflers. I will try and laser cut them at school this week.

I hope to set the 28th as my first outing with it. All going to plan that is.
The little things take the longest.

[TZ350]

There is no O-ring the valve, the tip is rubber.

They only leak after they are rebuilt (after changing jets etc.) but if I leave them for a bit with fuel in them (but fuel turned off) they sort themselves out. They also sort themselves out sometimes if I shake them.

I think that the floats are hitting something and catching, but have no idea what.

The floats hitting something has sometimes been a problem for us too......



Also this is the "O" ring, around the needle valve seat, (top left) that Bucket was talking about. It shrinks over (a long) time and leaks causing flooding, we always replace these now as a matter of course .......

[all4A50s]

Just out of interest (and I know this is off topic a bit) has anyone tried to fuel injection to a CB125T before?

[Yow Ling]

Just out of interest (and I know this is off topic a bit) has anyone tried to fuel injection to a CB125T before?

Cant imagine anyone has.

Do you think there would be some advantage to it?

Maybe easier to rejet, but how often do you do that?

[all4A50s]

Cant imagine anyone has.

Do you think there would be some advantage to it?

Maybe easier to rejet, but how often do you do that?

It was more of a ponderance question. The benefit would be the loss of time you get for the vacuum in the carb to happen. From memory it's about 0.2 seconds every time you twist the throttle, which at the Kaitoke track would be about 2 seconds a lap (10 corners). So it might be small but it is an advantage.

Then you would also be able to potentially control the fuel/air mix through out the throttle movement. Which could give abit more as well.