secondary air control valve?

[shadowmagic]

So i'm watching carburator videos and he mentions the "secondary air supply valve" that closes when the throttle is released to keep the exhaust from backfiring. Is that something I should replace or is a piece that can be maintained and fixed?

[yrunvs]

I very well could be wrong but I think you may be either talking about the anti smog apperatus in which case removal is the preferred approach commonly called desmogging or your referencing the air cut off valves attached to each carb. in which case you check to make sure they are working as designed.
search desmog and air cut valve off on this site.

[Madmike]

https://www.bike-parts-honda.ca/honda-motorcycle/1500-MOTO/GOLD-WING/1997/GL1500CTV/Engine/TUBING-AR-CM-SW-/13MZ0V41/E__2100/1/5688

#11 in the link

[shadowmagic]

My valk has been desmogged so maybe I dont have it? its connected in the center of the carbs. It looks like a connection to the air box then two big hoses that go down apparrantly somewhere by the exhaust on both sides. He just mentioned it closes and cuts off the air on decel to elimate backfires. Since I'm redoing my carbs for backfire, i wondered if that could potentially be the problem. Yes i think its 11 in the diagram.

[The emperor has no clothes]

My valk has been desmogged so maybe I dont have it? its connected in the center of the carbs. It looks like a connection to the air box then two big hoses that go down apparrantly somewhere by the exhaust on both sides. He just mentioned it closes and cuts off the air on decel to elimate backfires. Since I'm redoing my carbs for backfire, i wondered if that could potentially be the problem. Yes i think its 11 in the diagram.

That's all part of the smog stuff. If your bike is desmoged, it's likely all gone. You do have air cut valves on the top of each carb, which some have reported were blocked, and needed replaced.

[shadowmagic]

Ok, thanks for that info. I'm getting excited to take the carbs apart. I've watched tons of videos so I believe i'm  ready 

[The emperor has no clothes]

Ok, thanks for that info. I'm getting excited to take the carbs apart. I've watched tons of videos so I believe i'm  ready 

They aren't that hard. Get yourself set up with a large, clean area. Some of those cheap dollar Tupperware containers are good for keeping stuff together.

[WintrSol]

Ok, thanks for that info. I'm getting excited to take the carbs apart. I've watched tons of videos so I believe i'm  ready  

They aren't that hard. Get yourself set up with a large, clean area. Some of those cheap dollar Tupperware containers are good for keeping stuff together.

And get six of them - you don't want to mix parts between carbs.

[98valk]

My valk has been desmogged so maybe I dont have it? its connected in the center of the carbs. It looks like a connection to the air box then two big hoses that go down apparrantly somewhere by the exhaust on both sides. He just mentioned it closes and cuts off the air on decel to elimate backfires. Since I'm redoing my carbs for backfire, i wondered if that could potentially be the problem. Yes i think its 11 in the diagram.

"Since I'm redoing my carbs for backfire"

is that the only reason u are rebuilding the carbs? backfire out the exhaust is tuning and not normally faulty carbs needing a rebuild.  All IC engines backfire out the exhaust when getting off the throttle when a temporary leanness condition happens.  This is why mufflers are installed so it is not heard.

[shadowmagic]

Yes, thats the only reason i'm doing my carburators. I mean, the guy that sold it to me talked about how everything was perfect on the bike but if you're like me lol You have to see the fresh oil go in, you have to know the exact date the gear oil was changed and you want to make sure you flushed the cooling system and it has fresh coolant. Same with this carburator, I dont know if the bike sat there for long. I mean I bought it out of a storage unit  So i figure i can learn about the carburators, replace anthing that needs replacing and if a future problem happens, I'll know exactly where to go. God, i've become my parents lol

[98valk]

Yes, thats the only reason i'm doing my carburators. I mean, the guy that sold it to me talked about how everything was perfect on the bike but if you're like me lol You have to see the fresh oil go in, you have to know the exact date the gear oil was changed and you want to make sure you flushed the cooling system and it has fresh coolant. Same with this carburator, I dont know if the bike sat there for long. I mean I bought it out of a storage unit  So i figure i can learn about the carburators, replace anthing that needs replacing and if a future problem happens, I'll know exactly where to go. God, i've become my parents lol

what do u mean backfire? does it have an open exhaust? or does it just small pop pop when off the throttle?  when is it backfiring? usually it is something else namely tuning and doesn't require a rebuild esp since there isn't anything to wear out in the carbs. the o-rings are buna-n only being exposed to sunlight causes them to go bad, the fuel does not. Honda designed the bikes for 10% ethanol.

my bike sat for two yrs after I owned it and rode it for a few yrs, and only saw 2k miles in that two yr time period. that was over ten yrs ago, have never needed to do a complete tear down.  And I bought it new as a '98 leftover in '00.  my 2cents.
good luck

[shadowmagic]

I get some really soft carb farts at idle which are there but you have to listen for them. I get some pops when I let off the throttle and if its hot outside there can be some very loud pops like a muffled 22 gunshot. Mostly they are loud carb farts when its hot outside and when the bike is warmer.

[hubcapsc]

My valk has been desmogged so maybe I dont have it? its connected in the center of the carbs. It looks like a connection to the air box then two big hoses that go down apparrantly somewhere by the exhaust on both sides. He just mentioned it closes and cuts off the air on decel to elimate backfires. Since I'm redoing my carbs for backfire, i wondered if that could potentially be the problem. Yes i think its 11 in the diagram.

I just scrolled through the posts in this thead... have you checked your
intake runner vacuum caps? Are your muffler gaskets good? There's a couple
of de-smog writeups in Shoptalk, have you evaluated the "goodness" of
the former owner's de-smog job? If you still have the OEM petcock (I
still use and like mine) then you have at least one vacuum line left, is
it good?

-Mike

[WintrSol]

I get some really soft carb farts at idle which are there but you have to listen for them. I get some pops when I let off the throttle and if its hot outside there can be some very loud pops like a muffled 22 gunshot. Mostly they are loud carb farts when its hot outside and when the bike is warmer.

That sounds like it just needs a sync, and maybe a check of the pilot screws; a dose of Seafoam or Berryman's couldn't hurt. The closest I've come to taking my carbs apart is to put the stock size pilot jets back in, as it ran too rich in the lower throttle range; didn't have to take them off the bike for that.

[yrunvs]

And check the exhaust header nuts! Tighten them to 7 ft lb. Loose header nuts will cause popping and farting. Then set your idle screws to 2 1/4-2 1/2 turn out. Do this before removing carbs and see if it helps.

[shadowmagic]

Yeah i've checked everything I've learned on this site so far with the exception of those 6 air cutoff valves on the carburators. When I pull my carburators off does anybody know how to check if these are working?
I fixed a lot of loose stuff on the bike after following all the write ups on the site but the backfires remained. As far as I know the last culprit by process of elimination is the carburator, or possibly those 6 valves for air on the carburators, I also read somewhere that compression loss in a cylinder could cause that issue as well. I'm still running gumout  through the fuel system after running redline through it and it did help a little.

[98valk]

Yeah i've checked everything I've learned on this site so far with the exception of those 6 air cutoff valves on the carburators. When I pull my carburators off does anybody know how to check if these are working?
I fixed a lot of loose stuff on the bike after following all the write ups on the site but the backfires remained. As far as I know the last culprit by process of elimination is the carburator, or possibly those 6 valves for air on the carburators, I also read somewhere that compression loss in a cylinder could cause that issue as well. I'm still running gumout  through the fuel system after running redline through it and it did help a little.

if u have it at idle, then that might be an ignition problem. but more likely pilot jets are either dirty or out of adjustment.  run a can of B12 thru it.  adjust idle mixture screws two and half turns out from lightly seated.  sync the carbs.    http://www.factorypro.com/tech/tech_tuning_procedures/tuning_carbtune,CV,lower_rpm_engines.html

[WintrSol]

Just FYI, Gumout doesn't work nearly as well as a fuel system cleaner, when put into the fuel.

The air cutoff valves are vacuum-driven diaphragms, that shift position when the vacuum rises high enough. It is covered on page 5-10 of the service manual.

[98valk]

Just FYI, Gumout doesn't work nearly as well as a fuel system cleaner, when put into the fuel.

The air cutoff valves are vacuum-driven diaphragms, that shift position when the vacuum rises high enough. It is covered on page 5-10 of the service manual.

Gumout Regane is one of the products to use.  It uses PEA (polyether-amine) Technology.

[shadowmagic]

Yes, I'm using gumout system tune up I think its called. It has PEA.

[Bighead]

And please don’t t tourque the exhaust bolts. Just snug them up And check them in a couple hundred miles. No telling how many have snapped off a stud trying to tourqe them.

[mello dude]

My valk has been desmogged so maybe I dont have it? its connected in the center of the carbs. It looks like a connection to the air box then two big hoses that go down apparrantly somewhere by the exhaust on both sides. He just mentioned it closes and cuts off the air on decel to elimate backfires. Since I'm redoing my carbs for backfire, i wondered if that could potentially be the problem. Yes i think its 11 in the diagram.

A bit late to the party, but photos...

[trantony]

Shadowmagic, since you are having this problem and your bike has been desmogged, you might look at the small black plastic air cut off valves on each carb. If these go bad or have a vacuum leak I believe they could cause the backfiring issue you are having. Just another thing to check. You can go to Redeye Tech Services (redeye.ecrater.com) and get test procedure to check these valves. Good luck buddy, hope you find the problem.