SHORT VERSION:
What is the plastic vacuum hose thing in the bottom left of the picture and why should I keep it there?
LONG VERSION:
I have just received my new 2F carburetor in the mail
The old one does all sorts of strange things, the worst of which is idling at 4000 RPM at random times which makes it horrible at traffic lights and down hills where engine braking is needed.
After looking at the two carburetors side by side I noticed some differences:
Firstly there is an extra vacuum port on the old carby which isn't there on the new one (pictures 2 and 4, figure 1*).The one on the right connects to the distributor which regulates the timing. The extra vacuum port on the old carby (the one on the left) is connected via a hose (the one I photoshoped red with the artistic skill of a blind nun) to a strange plastic thing with two wires leading somewhere and another vacuum hose which leads to... another vacuum port?? on the manifold.
I have disconnected all of this with no ill effects aside from the two vacuum leaks. (What and why is it?)
And secondly the diaphragm and levers which make up the contraption called the "Choke Breaker" (see pictures 1 and 3 figure 2*) are non-existent on the new carburetor. Looking at the user manual, this is a standard feature of the OEM carby.
Although I still don't really understand what it is or why it's there, a little googling tells me that the choke breaker is not strictly necessary if you use the manual choke properly. It also seems to have something to do with emissions laws.
On my old carburetor this "choke breaker" is disconnected from the vacuum (the blue hose in picture 3 is blocked off with a bolt in the hose). However when I connect its vacuum hose to one of the aforementioned seemingly redundant vacuum ports, the choke breaker appears to work (that is to say that when the FJ45 is running with the choke on full, the choke breaker keeps the choke half open, (why not pull the choke on halfway?).
Whatever it does, useful or not, it does work so I could just put it on the new carby and attach the vacuum hose to the vacuum port that is currently attached to the strange useless plastic thing.
Which begs the question: What is the plastic vacuum thing in the bottom left of the picture and what do I do with it?
What is the plastic vacuum hose thing in the bottom left of the picture and why should I keep it there?
LONG VERSION:
I have just received my new 2F carburetor in the mail
The old one does all sorts of strange things, the worst of which is idling at 4000 RPM at random times which makes it horrible at traffic lights and down hills where engine braking is needed.
After looking at the two carburetors side by side I noticed some differences:
Firstly there is an extra vacuum port on the old carby which isn't there on the new one (pictures 2 and 4, figure 1*).The one on the right connects to the distributor which regulates the timing. The extra vacuum port on the old carby (the one on the left) is connected via a hose (the one I photoshoped red with the artistic skill of a blind nun) to a strange plastic thing with two wires leading somewhere and another vacuum hose which leads to... another vacuum port?? on the manifold.
I have disconnected all of this with no ill effects aside from the two vacuum leaks. (What and why is it?)
And secondly the diaphragm and levers which make up the contraption called the "Choke Breaker" (see pictures 1 and 3 figure 2*) are non-existent on the new carburetor. Looking at the user manual, this is a standard feature of the OEM carby.
Although I still don't really understand what it is or why it's there, a little googling tells me that the choke breaker is not strictly necessary if you use the manual choke properly. It also seems to have something to do with emissions laws.
On my old carburetor this "choke breaker" is disconnected from the vacuum (the blue hose in picture 3 is blocked off with a bolt in the hose). However when I connect its vacuum hose to one of the aforementioned seemingly redundant vacuum ports, the choke breaker appears to work (that is to say that when the FJ45 is running with the choke on full, the choke breaker keeps the choke half open, (why not pull the choke on halfway?).
Whatever it does, useful or not, it does work so I could just put it on the new carby and attach the vacuum hose to the vacuum port that is currently attached to the strange useless plastic thing.
Which begs the question: What is the plastic vacuum thing in the bottom left of the picture and what do I do with it?
