See, this is why I don't play with carbs!
Because the baffles have a collar at each end, which fit snugly inside the pipe diameter, I was concerned the gases on the outside of the perforated tube, between it & the pipe, would get "trapped" at the back end & cause back pressure. I need that rear collar though cos that's where they're bolted in.
The carbs spit when I blip the throttle.
It's an odd starting procedure. No chokes fitted, so just "tickle" the carbs to fill the floatbowls then kick. If you touch the throttle at all for the first minute or so it'll die. The natural inclination if it starts to falter is to open the throttle, but you can't. So just kick it over & leave it alone. If it stalls, kick it again. Once it's warm, it'll start first kick every time. So yes, the motor was warm.
So next time, give it 5 minutes to properly warm up & if it still spits back, try lifting the needles a notch Andy?
The new kickstart pedal's at the powder coaters Archie. Should have it back at the end of the week.