Hey I've just put my 4th tank through my Matrix and I took her to the local BMX track today to put the last 2 tanks through it before I started leaning her out. She has always started fairly easily and this morning was no exception... except.. it started stalling after 5-20 secs, often before I even touched the throttle. Thinking the plug had died I replaced it with a brand new one. That did not help. So I reset the needles to factory defaults, again the problem wouldn't go away. I slightly increased the idle, then richened the mid and low end, no good, leaned it out as well and it still dies. Getting a little frustrated (friend is up and running with his Swift thing, makes me annoyed I can't join him). I then replaced the fuel tubing, cleaned the mid range needle as well. Problem is still there. (Using a Cen Rotostarter, then my mates Ofna Starter Box, to no avail).
Car starts up, runs well, then 10-20 secs later it stalls. It has fuel flowing, no blockages either, really am baffled. Sadly I gave up and came home, want to try again tomorow.

Can anyone lend me some clues?

Thankyou in advance.

-Mike