ESE's works engine tuner

[wobbly]

My instant response is that is a 4 stoke emulsion tube.
With hardly any exception ( a couple of RD Yamaha's ) NO 2T has air corrector holes in the tube - they use a shroud in the bore.
So now we are off on a whole new tangent, especially as you have the issue of the needle/tube combination affecting idle - a major pointer, that should not happen right there.

[JanBros]

yet these carb's are common on 2strokes. I've found a website that sell's replacement dellorto's for all kinds of bikes where all the jet's , needles and tubes numbers are referenced, and they all use these types of tubes. On 1 engine 1 use PHBG's and they also use that type of tubes and on that one everything works just fine.
example's :
Carburateur DELL ORTO PHVA Ø17.5US Honda/ Kymco Scooters 50 2T E2 - Carburateurs - EasyParts.nl - De grootste in onderdelen en accessoires voor scooter en brommer
Carburateur Dell Orto PHVA Ø17.5ED Malaguti Ciak 100 2T 1999-2001 - Carburateurs - EasyParts.nl - De grootste in onderdelen en accessoires voor scooter en brommer

I've tried many combinations of the settings on that site but problem stays. I make my own throttle slides (because I hate the original's where you have to put the cable through a hole instead of just hanging it in through the groove that prevents the slide to turn), but it does the same with original slides.

[Jan Van Hamme]

JVH, there is alot of residual Blowdown pressure, shown by the bump at TPO - this will be reversing flow down the transfers.
I assume this is a function of the single Exhaust port and conservative timing to help front side.

Wobbly, I tried using higher timings today. I can't get rid of that bump at TPO.
I see the same bump in all the graphs on page 2716.
Is there a way to eliminate something like that? I have no idea how to do that.