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Carburetor help
Posted: Sat Jul 12, 2008 5:33 am
by Farmz
I need a picture of the standard Seirra carburetor with clead view of the vacuum hoses. I did some servicing on my Samurai, and disconnected the hoses without noting what hose went where. (yeah i know...extremelly STUPID).
Hope someone on here can post a pic so i can see.
Posted: Sat Jul 12, 2008 8:28 am
by Libber
yeah i have the same problem. English and american manuals are useless in trying to work it out. Would be great if someone could post a pic or a diagram.
Posted: Sat Jul 12, 2008 8:58 am
by want33s
What brand of carby do you have?
Here in Aust we only got the Aisin which is different to the U.S market.
Jas.
Posted: Sat Jul 12, 2008 10:00 am
by zook4fun
a pic of the aisin would be good for every one here
Posted: Sat Jul 12, 2008 10:55 am
by want33s
This might help.
Posted: Sat Jul 12, 2008 12:39 pm
by Farmz
Well I have a SJ80, which never went to the US, so i assume I have the Asian, and judging from the diagram it seems to be the same.
Thanks a bunch!
Posted: Sat Jul 12, 2008 4:02 pm
by Libber
yeah thanks for that, I have the Aisin one
Posted: Sat Jul 12, 2008 4:09 pm
by want33s
No worries... I found it in a Google images search of "Aisin carb"..
Only took a minute.
Posted: Sun Jul 13, 2008 12:36 am
by RockHopper
Tell me something. Does anyone know what the 2ndary actuator actually does? I 1st thought it was a vacuum operated secondary, but later discovered there is a mechanical linkage that opens the 2ndary's if that diaphram wasn't there or if it has held open
Posted: Sun Jul 13, 2008 7:59 am
by want33s
Just going from memory here........
I think the linkage (cam and arm) is only there to make sure the secondary closes when the primary does, not to open it.
Jas.
Posted: Sun Jul 13, 2008 9:00 pm
by suzimad
it is vacuum operated secondary , the other bit you are talking about serves 2 purposes , firstly it stops the secondary opening under 1/2 throttle , secondly it closes the secondary on deacceleration.
Posted: Mon Jul 14, 2008 6:20 am
by RockHopper
ok, what I don't understand is, with the cover off the carburettor so I can look down the throat, if I rev the crap out of the engine, I don't see the secondary's opening, but if I cable tie the diaphram into the open position, the secondarys work fine. Also, I've checked the diaphram with a vacuum gauge and it is working ok, and I've blown out the vacuum port with compressed air and it is clear, but still no secondarys. Could it be that the secondarys only open under load?? The car seems to go marginally better with that diaphram held open, but that could just be my imagination
Posted: Mon Jul 14, 2008 8:19 am
by lay80n
RockHopper wrote:ok, what I don't understand is, with the cover off the carburettor so I can look down the throat, if I rev the crap out of the engine, I don't see the secondary's opening, but if I cable tie the diaphram into the open position, the secondarys work fine. Also, I've checked the diaphram with a vacuum gauge and it is working ok, and I've blown out the vacuum port with compressed air and it is clear, but still no secondarys. Could it be that the secondarys only open under load?? The car seems to go marginally better with that diaphram held open, but that could just be my imagination
The secondarys open under load, when you free rev the motor there is no load, so there is no need for the extra air and fuel that teh secondarys provide.
Layto....
Posted: Mon Jul 14, 2008 8:06 pm
by suzimad
^^^ this man knows his shit ...
try this .. you may need a mate to help . undo the vacuum hose to the secondary ... hold open the primary (get your mate to put his foot flat to the floor on the throttle) pull up the secondary rod and put your finger over the vacuum line hole .. does it move a short distance and stop , then when you release your finger return ?
Posted: Mon Jul 14, 2008 10:15 pm
by RockHopper
lay80n wrote:
The secondarys open under load, when you free rev the motor there is no load, so there is no need for the extra air and fuel that teh secondarys provide.
Layto....
Thanx. Just what I needed to know. I recall the vacuum secondarys on the old Mitsubishi Sigma motors used to open the secondarys when free revving, and I expected that these Aisin carbies worked the same way. However when I road tested with the diaphram held open, and found no real noticable power increase, I began to wonder if they only opened under load.
@ Suzimad I tried that with a mightyvac, and yep, the diaphram is holding.
Thanx guys. Having always owned bigger, more powerful cars, and having only owned my zook for a couple of weeks, I'm still not entirely sure about how well it's supposed to perform. I did'nt expect a powerhouse when I bought it, I'd just like to ensure that it goes at least as well as the way mr Suzuki had intended it to.