What type of porting can i say mine is???

[quam]

i think b russel's on to something. might be the best idea to just get a cheap stock jug off ebay and have em ship it to a builder then have it shipped to you.....
if you're gonna get a big bore kit, DEF get it ported. like stated earlier, a ported stock jug will easily out perform a non ported bbk. also, talk to kennedy_power, he is developing a ported 244 kit.
as for your work, there is a LOT more to redesigning the head than just making the dome bigger. you need to bring the squish band and angle down to exact (like thousandths of an inch) tolerances.
bringing up the exhaust port will increase the rev limit of the jug, but you need the width to be an exact percentage of piston diameter to properly utilize the engine's power. it's not a matter of just widening it a bit here and there. you need to make exact calculations.
like transfer timing, changing your transfers is critical for creating power, blowdown time, this is all calculated by crank degrees and gets way more complicated than i'm capable of keeping up w/, transfer roof angles also play a part....
and as for the intake. the stock intake unported flows more than you're able to use. you don't really have to do a whole lot to the intake. i believe the vf3 only flows about 10 more cfms than the stock intake can handle....
basically, my point is that having an experienced and knowledgeable builder (i always recommend kennedy_power) do your work will develop 10x more power than you can do in the garage.

 

[b_russell_82]

Another option for you being in europe is finding a DT200 cylender and use it. There are a few other mods that have to be done to make it work but there are a few ppl on here that have done it.

 

[squeaklad]

its actually really hard to get them d200 engines over here, im in Northen Ireland an there isnt any here or in the uk so i cant see him finding one

 

[Wildcard2]

Lassek, it is going to be impossible for anyone to make a guess based on pictures as to how your portwork will perform. Accurate measurements of port timing and port widths would be needed to make a more accurate speculation. There are some inconsistencies in Jennings book that I sent you when compared to the industry standards used today. One of the main ones that comes to mind is his recommendation not to modify the transfer ports. I don't know of any reputable two stroke tuners who don't alter the transfer timings and angles to get the desired effect. I sent that to you as a good reference to try and prevent you from damaging your cylinder. I hope it runs well and to your satisfaction. And as for the intake, it is less than 10% of how a cylinder will perform. Over enlarging it can lead to a loss of low rpm velocity and a loss of power below the curve.

 

[Kennedy_Power]

Bingo Wildcard2
You made some good points
Scrap those books and there transfer port and exhaust timing
Scrap TSR ( totally Slow Racing)
Those software and books are off the mark, they are really out in left field when it comes to pipe design
I agree with wildcard2; you can not tell how its going to perform from those pics. I would say from 3000+ dyno pulls that the power increase will be zero
based on the pics