How to upgrade pwk floath valve?

[marrcel]

I changed my vm26 floath valves a number of times. Just unscrew the retainer.
My china pwk30 are on the bike trying to jet properly. But topend stays lean >8krpm wot.
I took e picture but couldn’t find out how to remove the floath valve. Any tips which one to order?

[bare]

China Fake PWKs have Proven problematic.
There was one brand maker that was 'better' than some fakes can't remember which, but they had a following among Scooter fiddlers.
Even so, a Years ago gone face 'here' in this Forum. Spent Months and as it eventually turned out:
Significantly More $ than the price of Brand New Keihins... Trying to get his Fake ones to work as well as genuine ones.
And to add insult to injury his results weren't 100% either

[Tobyjugs]

Hi Marrcel it could be the power jet not being able to supply enough fuel.

One very handy tool I use is a set of reamers for carburateurs. You can use them to compare hole sizes. Or open up fixed jets.

[marrcel]

Thx that is what i read all the time. But i like a challenge.
If everybody says use oem jets. I like to explore that. I found different experience. I ordered 2 sets of china copy jets. I measure both sets if they have the same diameter and logical increments.
In my vm26 i used a china 270 which is about oem 290. That is fine for me.
Fair to says is that it is easier ordering whit the china app. I do a fair amount of ordering with it for electronics. I rebuilt tube radio’s into 500W blue tooth speakers.
Back to pwk copies.
I noticed that the float is rather volumetric. The shape is more round than flat. I measured 21mm on the rounded part of the float. Keihin says 19mm on a float which is a flat horizontal shape see picture.
First i am going to raise the float level.
Second i am going to measure the surface area of the inlets of the chicken feeder around the jets.
Third i am going to measure the diameter of the float valve. But to be honest I forgot to close the petc@ck of the tank. And there was running a lot of fuel out of the carb without the bowl on it. May be i will do some flow measurements for both sides. Say ml fuel in 10 seconds or so.

[marrcel]

Here a picture of another idea with raising the float level. This is for compensation of the angle of the carb.

[Tobyjugs]

Hi Marrcel when I optimised the inlet and reeds for Kees's bike the standard carbs couldn't cope and run lean even with a 520 size main jet. I also raised the float level 2 or 3mm and it still had very little effect. If you are achieving the correct float level and you are getting enough fuel, try blocking off the power jet and go big on the main jet. Don't worry about mid range ect just try to achieve good jetting at the top end. This could prove you need a bigger power jet
Or open up the jet you have if it's fixed

[marrcel]

Thx Tony. At the mo it doesn’t matter which mj is used. It is just sucking foam >8krpm i think.
The powerjet is probably doing nothing at all, because the fuel line for the powerjet is at the highest point of the float bowl. I will investigate this also thx👍

[marrcel]

I enlarged the floath valve from 2mm to 3mm. Needed a longer floath needles.
Finally it was running too rich at wot and 150mj. Everybody’s echoing the floath bowl is too small. Which it isnt.
The belows are disrupting the flow from airbox. So I ordered some cheap bling and took the dremmel.