I got the screw out! did a combo of those suggestions, thanks. But ended up cutting the head off, removing the float chamber and twisting the remaining stud with vice grips to unscrew it. Usual suspect, white powder from the aluminium was on the end of the screw. Found a bolt with the same thread to replace the old screw.
After that, I finished taking it apart, cleaned it and put it back together! all in one day everything went better than expected. I managed to get it back on the car and all connected up as well. Here's where the troubles start
First startup: absolutely perfect, sounded like I've never heard it run before, smooth, quiet and no misfires to speak of. 5 seconds in, engine starts revving up and then loud (I mean LOUD) popping/knocking sound coming from the engine, even louder at tailpipe. Engine continued to rev till I shut it off.
2nd start: fuel sprayed out the top of carb, engine started and same popping/knocking sound, shut off after a few seconds.
All starts after that: no more fuel spray, but still same noise and engine revs up gradually. Pushing accelerator makes the noise louder (duh
![Roll Eyes (Sarcastic) :rolleyes:](./images/smilies/rolleyes.gif)
) Also venturi at the front of the carb (primary?) is wet with fuel. Exhaust does not smell of fuel.
I have no idea what's making the noise but some things that could have gone wrong during rebuild:
- Primary and secondary jets could be swapped (they both fell out together and I didn't know which was which for sure)
- Float level was altered because according to the book it was about 15mm out
![Confused :confused:](./images/smilies/confused.gif)
but the level on the sight glass is almost perfect, -/+ 1mm over the dot in the middle
- Idle mixture screw could be completely off; the mix screw before was completely missing a washer and O-ring, and was turned right down to the seat and car was still running rich. Because of this I had no rough guide of where to return the screw to (number of turns)
- Something about the choke position doesn't seem right, and the car starts up and revs up on its own with zero choke input even from stone cold
![Confused :???:](./images/smilies/icon_confused.gif)
- When I pulled the carb off to begin with a little bit of coolant went into the manifold and slipped down to drivers side cylinders
Whatever the case, looks like I'm taking the carb off again
![Sad :(](./images/smilies/icon_e_sad.gif)
At the moment I'm leaning towards jets being swapped since one of the venturis is glistening with fuel, but would it really make that noise and rev up the engine? I also pulled the plugs on the drivers side, they were bone dry but carbon fouled from before the rebuild. If you ignore the noise, the engine seem to sound ok, but it's hard to ignore the noise
vid:
http://www.youtube.com/watch?v=rNA79m2-5WA