84 Standard Secondary Aire System

[heath1066]

Cleaning the carbs before spring and just took off the SAS... Now contemplating removing it. Anyone done that? More importantly, anyone done it and made it look good by the carb boots?

[flyin900]

Have a GL1200 Standard and not familiar with the SAS? Could you clarify what you mean, as I have a couple of vacuum hoses that operate off the #3 and #4 carbs and are needed.

[ericheath]

Pretty good description here: viewtopic.php?f=1&t=60441&p=667018&hili ... em#p667018

[flyin900]

Ok that explains it as I have a Canadian bike and I have never seen anything that resembles a SAS on my model.

[heath1066]

I think this may be complicated by the fact that I have a California Model with a purge control valve... Much more research necessary at the moment...

[flyin900]

Heath,

Here is a picture of the bottom of the plenum of the Canadian model without the SAS system and the two larger hoses from the black plastic air passages can be routed to the bottom of the air cut valve as shown. The smaller rubber hose that comes off the very top fitting on the air cut valve is connected to a nipple on the #3 carb area. It has been moved over to the wrong side in the picture and it may connect to a nipple on the intake runner. It has been awhile since I did the rebuild and the bike is put away for the winter. So hopefully you have that nipple on your set up too, either off the #3 carb or the intake runner for #3.
The other small hose on the right hand side of the plenum looking at it from the top of the picture is connected to a nipple on #4 carb and that runs up to the vacuum advancer box for the timing that is situated on the left hand side of the shelter at the top section of the frame. You should have that set up to run the vacuum advancer so that should be the same set up as mine.

If you have all these connections on your # 3 and #4 carbs then I would say you just need to plug the hole in the bottom of the plenum where you removed the round section that has the round area and an O ring seal on yours. As you can see on mine that area is not drilled through into the bottom of the plenum.

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[heath1066]

Thanks, the problem I am seeing is that every carb has a vac line like 4 and they all go to the Purge control valve. That's where I'm stumbling at the moment. The secondary box seems easy enough, just looking at that Purge valve

Like below:

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[flyin900]

Heath,

I would consider plugging all four of the larger hoses that lead to each of the individual intake supply manifold tubes and the inlet side on the main plenum for each hose. It looks like your #3 carb has the vacuum port on the carb near the bottom of the float bowl which you would attach the small rubber hose that runs up to the electronic advancer box. Then there is a nipple on the backside of #3 intake runner and I would leave that connected to the after burn circuit as it already is with the T joint and the other small rubber hose that runs up to the top of the air cut valve 90 degree elbow. If you want to remove the afterburn valve then you will need to plug the hole into the plenum underneath the valve and reroute the small vacuum line directly to the 90 degree elbow on the air cut valve from the #3 intake runner.

Leave the larger rubber hoses that are already connected to the black plastic T's that are connected to each carbs air passage circuits, so no change needed there. In theory the changes should give you the vacuum for the air cut valve operation and the afterburn valve if you leave it in there, plus the other vacuum supply connection to advance your timing via the electronic box.

I am not familiar with those metal tubes that come off of your intake runner area of each carb. Maybe there is a way to remove those and plug the circuit at the head/intake runner area to clean that up. Then you would just need to plug the rubber hoses that are connected to each of their plenum inputs.