Bandit Alley
GENERAL MOTORCYCLE FORUMS => GENERAL MECHANICAL & TECHNICAL => Topic started by: DaveG on August 02, 2007, 11:23:19 AM
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thought i would disable the pair system by plugging the small vacuum hose to it.
now i am getting increased popping and backfiring through the exhaust.
would it be better to plug the air supply hose?
did i make the pair full time by plugging the vacuum?
I thought that it would only supply air to the exhaust under high vacuum conditions. but maybe it's the other way round.
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Plug the air supply hose, not the vacuum hose.
Manifold vacuum actually drops when you open the throttle, since it is created by the throttle plate restriction. It is the difference between atmospheric pressure and manifold pressure.
Venturi vacuum increases when you accelerate. Depending on whether your particuler air injection system is actuated by manifold vacuum or venturi vacuum determines when air is injected into the cycle.
I'm not familiar with the details on the PAIR system, but most injection systems serve the same purpose... burning excess hydrocarbons to reduce emissions.
Did you get the EFI trouble light with the vacuum hose plugged?
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There is a good write up in the FAQ's you can access by CLICKING HERE..... (http://forums.banditalley.net/viewtopic.php?t=198) Unfortunately the pics are gone but the text should be self-explanatory
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I can understand why someone might want to remove it (K&N pods, easier maintenance, and/or a little less weight), but I don't understand why one would want to just disable it. It doesn't help or hurt performance, it only effects emissions.
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ok we are talking 2002 B12S here
no EFI
so my real question is did I plug the Manifold vacuum or the vernturi vacuum?
tracing the hose it seems to be on a t-fitting connected to the #4 carb. it also supplies vacuum to the fuel petcock.
my guess would be that it is venturi vacuum.
I will unplug it and plug the air supply.
wasn't that some 70's/80's hair band???
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it pumps air into the exhaust causing unburned mixture to combust.
it reduces unburned hydrocarbon emissions but with aftermarket can you can hear the combusting results in popping and backfiring.
i would rather not have that.
I plan on removing the pair later but for now just want to disable it.
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With no PAIR you will still get some popping on decel with an aftermarket exhaust.
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some yes
hoping for less though.
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Manifold vacuum is between the throtle plate and the head, venturi vacuum is between the throttle plate and the choke, basically... or in the carb "throat".
Most vacuum-operated devices use manifold vacuum. it really doesn't matter in this case, because you only need to plug the big hose from the air box that supplies air to the valve.
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plugged the right hose = no more popping NONE
BUT i have been turning out the mixture screws to try and fix it and am now too rich.
will turn them in 1/2 turn per day until i hear a little popping and then will be just right.
THANKS
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Doesn't the stock can have a catylitic converter? So if you are still running the stock can you would want to feed all the fresh air you can to it to have it burn off all those nasty unburnt gasses. Thus, the PAIRS system.
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Doesn't the stock can have a catylitic converter?
Not 06's or earlier.
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Here's a picture of the Holeshot PAIR removal plates on my '03...
(http://i5.photobucket.com/albums/y156/PaulVS/PAIR.jpg)
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Well, Ny 06 does, Bud.
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That's odd, I've read 4 or 5 reviews of the 06 and not one mentioned the addition of a cat. Where exactly did you read that it has one?
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Shop manual. Cutaway view of the can. "Three-way Catalyzer.
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In that case, maybe that was the reason for the one piece midpipe and can. Makes me wonder whether the 04-05 had them too, and most never realized it. Anyway, this thread was about an 02 Bandit, not applicable.
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Doesn't the stock can have a catylitic converter?
Not 06's or earlier.
Not entirely true. The California model of the 2005 B12 has a catylitic converter, but as far as I know, it's the only market that got one before 2007.
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You must have missed rocketjocks reply. His 06 has one.
Searching the net, I did find some archived dealer sales specs. The original Suzuki supplied stuff. 04's stated a cat was new for that year, for Calif only models. I wonder now, especially since nobody can find a non-calif stamp on their 07's, no matter what state they live in, whether they did the same thing back in 04, and 05. That is supply ONE version to all states. The change with the welded one piece exhaust makes me think they all might have a cat since 04.
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You're right, I overlooked Rocketjock mentioning his '06 has one. :duh:
If you think the '04 & '05 models may have all come in CA version, the easy way to tell would be to look for the charcoal canister and roll-over valve. The 49 state versions in '01-'03 don't have them. Standing at the back of the bike, looking towards the front. The canister is on the right hand side of the bike. You should see a black hose mounting block and a black canister. The roll-over valve sits just forward and above the rear master cylinder.
Roll-over valve:
(http://www.billsbikesnservice.com/pr4.jpg)
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Yeah, I guess it would make sense if they imported ONLY calif versions in 04 and 05 that they would probably have the charcoal canister. Now we only need to hear from 04-05 OWNERS if they have the canisters or not.
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Of course now that my bike has the jet kit and aftermarket, all that stuff is gone. So, drink up. Plenty more pollutants for everybody.