Air cut-off valve


Information and questions on GL1200 Goldwings (1984-1987)
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aspencadeguy
Posts: 4
Joined: Sun Jul 14, 2013 7:37 am
Location: Detroit, Michigan
Motorcycle: 1986 GL 1200 Aspencade

Air cut-off valve

Postby aspencadeguy » Sun Jul 14, 2013 7:55 am



Hi, everyone. I'm a new member and already have a question. Does anybody know where air cut -off valve is located on a 1986 aspencade, from what I know there is only one somewhere between air cleaner box and the manifold, but do not know exactly. I have read that this valve has been faulty for years and causes for a longer choke and warm up time, any info would be awesome. Thank's



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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Air cut-off valve

Postby virgilmobile » Mon Jul 15, 2013 9:06 am

As I recall it's on the bottom of the plenum box.

It's function is to enrichen the fuel system to prevent popping/backfiring during decelleration.

aspencadeguy
Posts: 4
Joined: Sun Jul 14, 2013 7:37 am
Location: Detroit, Michigan
Motorcycle: 1986 GL 1200 Aspencade

Re: Air cut-off valve

Postby aspencadeguy » Mon Jul 15, 2013 3:24 pm

THANK YOU, for reply to aspencadeguy. Do you happen to know how to get to it??? LOL

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Air cut-off valve

Postby virgilmobile » Mon Jul 15, 2013 3:54 pm

2 screwdrivers,2 10mm wrenches,1 10mm socket with a extension,3 band aids,1 favorite beverage and 55 minutes.
The entire carb assembly comes out onto the floor.Flip them upside down and just 2 more screws.

After the hours of repairs it's only a hour and a half before you can ride again....
That's if you don't bother to sync the carbs. :lol:

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Air cut-off valve

Postby virgilmobile » Mon Jul 15, 2013 4:04 pm

causes for a longer choke and warm up time


Now be aware,replacing this valve may not affect this symptom you describe...
Exactly what do you refer as to a "longer choke and warm up".???
My 1200 sometimes needed a choke.Usually after setting a few days,and the warm up time was about how long it took to get 'our' helmets on,the purse put in the trunk,kick the tires,set the radio and listen to where she wants to go. :roll:
If I just jumped on the bike,used the choke to crank it,I would leave it on part way for about 1/2 mile.
This ain't no computer controlled,multi port,fuel injected bike...It takes a couple of minutes to get all the springs wound up. :D

aspencadeguy
Posts: 4
Joined: Sun Jul 14, 2013 7:37 am
Location: Detroit, Michigan
Motorcycle: 1986 GL 1200 Aspencade

Re: Air cut-off valve

Postby aspencadeguy » Mon Jul 15, 2013 7:05 pm

I will probably need 6 bandaids and more bevrages, but thank's for the great reply. The reason that I want to change it was because I had read that's why the 1200 took a little longer because that valve was in fact defective and dealers didn't know about it either. So I got one. My wing pretty much runs as you explained, I will change it as soon as I get around to it. It's not a must, but want to know if it does change it. When I do it I will let you know. Thank's again

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redial
Posts: 1993
Joined: Mon Jan 03, 2011 1:17 am
Location: Kapunda, SouthAustralia
Motorcycle: 1997 GL1500 Spectre Red Aspencade

Re: Air cut-off valve

Postby redial » Tue Jul 16, 2013 7:21 pm

When you get around to doing it, pretty pictures please - we love pictures, except those with Doris Day :lol:
Len in Kapunda

The world is not going to finish today, as it is already tomorrow in Australia and New Zealand, and other islands of foreign nations such as Guam and Samoa.

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Mooseman
Posts: 383
Joined: Thu Sep 10, 2009 11:10 am
Location: Napa, CA
Motorcycle: 1996 GL1500SE 88k
1986 GL1200A (SOLD) 81K
1985 GL1200A (SOLD) 85K
1986 BMW K75c 25K

Re: Air cut-off valve

Postby Mooseman » Tue Jul 16, 2013 11:19 pm

Both my 85 and 86-A were cold blooded. Needed choke when cold and would pop and snort if taken off too soon. I don't wait around for mine to warm up. I start riding right away and if the road is long enough with no stops I take the choke off when I get in 3rd or 4th gear and good to go. But I think the CA models run a little leaner than the other 49.
Enjoy the ride. They are all good, just some better than others.
Mooseman

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Coolride
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Joined: Mon Jun 10, 2013 9:57 pm
Location: Sebring,FL
Motorcycle: 1984 1200 aspencade

Re: Air cut-off valve

Postby Coolride » Sun Jul 21, 2013 7:31 am

My bike manual says their was a recall back in the day for the lean popping condition, and gave the list of engine serial numbers in the recall. Said the jets in the carb needed to be changed. My bike was in the recall list, but I could see by the jet numbers, they were never changed. Must of been one of those "If your not complaining" were not changing them recalls.

mainer4
Posts: 8
Joined: Tue May 21, 2013 10:56 am
Location: Limington, Maine
Motorcycle: 1985 GL1200 Interstate

Re: Air cut-off valve

Postby mainer4 » Thu Aug 01, 2013 9:38 am

Anyone have any information on the factory recommended fix for the carb jet recall (part numbers) and the engine serial numbers involved? I have what turned out to be a California bike (in Maine?) and it definitely has symptoms of running lean. The fact is, this bike has completely disappointed me from a power/performance expectation. I see pictures of 1200's pulling trailers and can't imagine my bike pulling a trailer, it can hardly get out of its own way with just me on it. Give me my '75 CB750 Super Sport any day of the week! GL1200's one virtue is that it handles better than the 750 due to its low center of gravity, especially at low speeds, which is all I seem to be able to get it to do... ;)

Oh, yeah, is there a trick to getting these things up on the centerstand? :?

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Air cut-off valve

Postby virgilmobile » Thu Aug 01, 2013 9:55 am

mainer4 wrote:Anyone have any information on the factory recommended fix for the carb jet recall (part numbers) and the engine serial numbers involved?

Oh, yeah, is there a trick to getting these things up on the centerstand? :?


I found that if I had 35psi in the rear shocks,it helped...There's a "how to" about that too.
viewtopic.php?f=12&t=9476

As far as your carb problem...does adding just a little"choke" improve it's acceleration in the 1500-3000 rpm range.?
Mine was a touch lean..I added a washer under the main jet needle in the slide to boost the fuel mix just enough...A real good sync helps in the off idle to 1200 rpm pull too.
Here's my 84...viewtopic.php?f=5&t=9179

1Oldman
Posts: 8
Joined: Thu Nov 22, 2012 6:54 pm
Location: Manning, South Carolina
Motorcycle: 1984 GL1200 Interstate

Re: Air cut-off valve

Postby 1Oldman » Sat Aug 03, 2013 4:40 pm

I just went ahead and rebuilt carb's, replaced the air flow valve and the slide diaphragms, it was about $300 in parts but all these things can cause the heavy choke and the 1500 and 2500 cough. Now Goldie runs great full power and I get about 32 in town and 40 on highway. 1984 GL1200I :D




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