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ok now the starter isn't working, no turn over of the starter motor just a click click (battery is charged tried another battery as well to make sure)

It's still craphouse ...

This is a two stroke Mikuni carb.

Ok first run, 10 minutes she went snuffo again. It started straight away and I rode it home. I took the fuel cap off completely and went for another run. 10 minutes in she cuts out again. Again it starts straight away and I limp home. No full throttle cut outs this time just normal riding.
God tends to play cruel tricks on me. I have the clear fuel lines and the fuel isn't exactly pumping out. I took the new tap off to look for a blockage and found I had only about 100mL of fuel left in the tank. This is despite the gauge showing over half full. I now find the gauge only works "above" this mark. i.e. if I fill it, it will show full but it does not drop below just above half.

Almost running out tells me I am using way more fuel than normal due to the #90 mains, something I will have to get used to.

As the fuel tank was empty I experimented with 100:1 premix ratio (oil pump is connected as well). Interestingly the same amount of oil smoke is coming out of the pipe as it was when I was running at 45:1. At 100:1 (3 litres fuel, 30 mL oil) it idles a lot faster as well. (I am using 98 Octane this time.) I ran out of time but I think I will boost the premix up to maybe 60:1 and hopefully it will keep going this time.

I thought I had modified the cap enough to vent but I went home and put it on the grinder see below to try and get some air through.




Then I thought stuff it and drilled out a 3.5 mm hole through the top of the tank.




I then rode it for about 20 or 30 minutes daring it to stop on me. It didn't. I am not out of the woods yet, I will do more testing and plug chops but I seem to be on the right track now.

Great thanks everyone, this is all very helpful, I'll tell you where I'm at.
I live in the most remote capital in the world (Perth, Western Australia) so I just can't go to my local shop and get stuff as they have no stock so I usually order off EBay and wait for the delivery (one or two weeks).

FUEL LINES
I have ordered a clear fuel line and will install that when it arrives. I took the vacuum hose off and sealed one end and blew from the other with the line under water. No bubbles no leaks. I paid particular attention to make sure it was completely sealed and fastened to the carb and the tap. I will unbolt the seat so if it stops I can quickly lift out the seat and bucket to check the fuel line.

PREMIX
I am only putting 500mL of fuel in a time so it is easy to make it 50 : 1. I will do that. At the moment I am witnessing blue smoke out the pipe which is reassuring, but not the optimum.

REEDS
I am running carbon fibre reeds. They have 1000 kilometres (625 miles) on them. I pulled the block out and held them up to the light and there are no gaps.

FUEL LINE ROUTE
Good point. I fitted an aftermarket fuel filter and in the process The line dips and rises (once), probably an inch to two inches from its lowest to highest "hump". I will fix this.

VENTING
I thought I had prepared for this by filing back the rubber seal around the cap but it still appears to have a strong seal so I will fix this. I didn't want an "open vessel" type situation say like a petrol can with the lid off as the petrol would loose its oomph and I have previously had trouble starting the bastard.
In saying that, with the 70cc kit and the new carb it is starting first go every time!

thanks again, stay tuned!!!!

Good stuff. I have a Technigas as well. I suspect anything over 80KPH with these will exceed the limits of the chassis and brakes so that will do me fine as a max. What do you think of my oil set up? i.e. pump plus 45:1 plus Silkolene Scoot oil?