1990 Laser Auto Choke

[Abb0]

Hey There,

Before this afternoon I thought that I could answer most questions regarding carbies. After all, they're basically a calibrated fuel leak, right?

Now, I've been having starting issues with my 1990 Laser in that the choke didn't appear to be working. I tried the "press the go pedal to the floor before cranking" with no joy. So today I took the aircleaner off only to find that the choke butterfly was indeed closed. Yet the engine was still only trying to idle at normal revs. As the engine warmed the choke butterfly slowly opened until it was verticle. What else needs to happen when the choke is on/engaged for the engine to rev higher?

Another issue that may or may not be related is that the vacuum controlled secondry throat doesn't appear to be opening. Should I be able to see it opening by manually manipulating the throttle while the engine is running? I was revving from idle (to try to load it up) but it never opened. It seems to be activated by a vacuum/diapragm arrangment. Has anyone had problems with this before.

And if you've read to the end of this, thanks for being patient

Cheers
Abb0