Hi Max,
I wasn't clear enough. The tubes can be bent by over tightening the nut on the end of the emulsion tube. Put too much "twist" into it and it looks like you can shear the soft brass. Either way, not ideal!
I tried chasing fiber washers but to no avail. Got a handful of copper and alloy ones, but I rebuilt the thing with the original fiber ones just to see, and to my surprise it works perfectly. Half pull cold start! Must have been some crud either preventing the needle from seating or the fiber washers were pinched?
It's a real shame the metal gauze filter was wrecked by the layer of varnish in the bottom of the tank. I've flushed it with fresh fuel and some metho multiple times but I'll need to come up with a long term solution. I'll either use the other fuel tap on the spare motor (looks like the original push/pull setup) or maybe install an in line filter further down stream.
On closer inspection, the two "rubber" seals on the banjo bolt were leather! They still worked...but I've replaced them with Viton o-rings. Allows some movement for slight rotation while still providing a seal.
Thanks heaps for your assistance here. There isn't much info on these things on the net and I really appreciate your input. Next step is to properly set the mix and keep the throttle block and needle moving freely.
