1987 1200 Aspencade Bogging


Information and questions on GL1200 Goldwings (1984-1987)
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87goldaspy
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Motorcycle: 1987 GL1200 Aspencade

1987 1200 Aspencade Bogging

Postby 87goldaspy » Fri Aug 21, 2015 9:10 am



Hello all and thank you in advance for any help! I recently bought my first goldwing and I have found the biggest mechanical headache of my life haha. The bike sat for roughly 7 years due to the PO not knowing how to rebuild the clutch master cylinder. I've already done that and also had to pull the carbs because fuel was left in the bowls. I tore them down and boiled them in lemon juice to clean them out. Then I got it running after a new battery and some fresh gas and I also synced the carbs. He did drain the tank just not the carbs. Now for the problem. It starts and idles perfect and sitting in neutral it will rev to red line quickly. Though when riding it will pull great up to about 3,000 rpm give or take and then it just bogs and won't pull any higher. I've been through the carbs a total of three times now and every now and then it will pop through the carbs. I do have the timing covers off and it is in time correctly and I even put a timing light on it and all seems well. It also has new plugs, wires look good and coils check out with a multimeter. Is there something I'm overlooking? It has to be simple it runs to good on the bottom end to be serious. Thanks again for any help!



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Re: 1987 1200 Aspencade Bogging

Postby WingAdmin » Fri Aug 21, 2015 10:23 am

Just in case you haven't done this already - change the timing belts! First, before anything else! Especially because the bike sat for seven years, you really should not be running that engine at all until the timing belts have been changed.

87goldaspy
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Location: Saltville, VA
Motorcycle: 1987 GL1200 Aspencade

Re: 1987 1200 Aspencade Bogging

Postby 87goldaspy » Fri Aug 21, 2015 10:48 am

Sorry I forgot to mention that... here is all I have replaced/done; timing belts, spark plugs, vacuum lines, (not related) clutch master cylinder rebuilt, cleaned and synced carbs, checked plug wires, checked coils, checked fuel pump is working and it's putting out 3 psi, and rechecked timing with a timing light and all seems to be correct. It seems to me that possibly the slides aren't working in the carbs but i cant find a reason why. They don't seem to have any rips or pinholes in them and it has the factory covers. I am completely lost on this thing haha I am mechanically inclined (I'm a automotive mechanic) don't get me wrong but I for the life of me can't figure out why this bike is doing this. I though am not very familiar with cv carbs. There very well could be something in there I'm overlooking.

87goldaspy
Posts: 12
Joined: Sun Aug 16, 2015 11:15 pm
Location: Saltville, VA
Motorcycle: 1987 GL1200 Aspencade

Re: 1987 1200 Aspencade Bogging

Postby 87goldaspy » Fri Aug 21, 2015 4:57 pm

Ok an update I just checked the stator with a multimeter and all is good there and I have also learned if I block off the air cutoff valve from inside of the air box it runs some better but the problem is still there.

87goldaspy
Posts: 12
Joined: Sun Aug 16, 2015 11:15 pm
Location: Saltville, VA
Motorcycle: 1987 GL1200 Aspencade

Re: 1987 1200 Aspencade Bogging

Postby 87goldaspy » Fri Aug 21, 2015 5:52 pm

Ok I have determined I have a lean issue... With some crafty duct tape work and a little thinking I blocked off part of the air box opening and man this thing will flat out fly. Now the next question how to riches this thing up since the carbs are not adjustable? I'll try to post a pic of my contraption if I can figure out how from my phone.

87goldaspy
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Motorcycle: 1987 GL1200 Aspencade

Re: 1987 1200 Aspencade Bogging

Postby 87goldaspy » Fri Aug 21, 2015 5:54 pm


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wingman12
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Re: 1987 1200 Aspencade Bogging

Postby wingman12 » Fri Aug 21, 2015 6:53 pm

I could be all wet, but it is hard for me to imagine that there is not air/fuel mixture screw on that carb. I went on the Honda OEM parts site for the 87 A and the picture showing the carb looks like part #5 which is a screw set A (and it also shows a cap) sure looks like a air/fuel needle to me. part# is 16016-ME3-003. I have been wrong more times than right, but I keep trying to improve on my percentage. :D :D

87goldaspy
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Re: 1987 1200 Aspencade Bogging

Postby 87goldaspy » Sat Aug 22, 2015 12:43 am

That's just for the idle mixture isn't it? It idles great and low end power is good. It's going lean once the main jets should be taking over.

87goldaspy
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Motorcycle: 1987 GL1200 Aspencade

Re: 1987 1200 Aspencade Bogging

Postby 87goldaspy » Tue Aug 25, 2015 10:50 am

Will the mixture screw richen the mixture throughout the rpm range or just for the idle? It's still running lean and I've went over it all again checking for vacuum leaks and didn't find any.

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virgilmobile
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Re: 1987 1200 Aspencade Bogging

Postby virgilmobile » Tue Aug 25, 2015 11:37 am

2questions...did you look at the diaphragm of the air cutoff valve and are you running this without a air cleaner and the top secured on the air box?
Both can cause problems.

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virgilmobile
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Re: 1987 1200 Aspencade Bogging

Postby virgilmobile » Tue Aug 25, 2015 11:39 am

Also,you can verify the slides work by using a mirror to see them and rapping the throttle.they should slide up and closed smooth with air flow change.

87goldaspy
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Motorcycle: 1987 GL1200 Aspencade

Re: 1987 1200 Aspencade Bogging

Postby 87goldaspy » Wed Aug 26, 2015 12:52 am

I did checkout the air cutoff diaphragm and it doesn't have any holes or tears in it and I've tried it with and without the air filter and filter box and it does the same thing either way. I will try to check out the slides tomorrow. I will be moving tomorrow but will try to get a chance to check them and report back.

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virgilmobile
Posts: 7649
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
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Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 1987 1200 Aspencade Bogging

Postby virgilmobile » Wed Aug 26, 2015 7:27 am

If the slides move normal,next time you can get it to stumble,add just a little "choke".
This is a fuel enrichening valve.
I did raise my main needle to improve the midrange problem.
I also had one stuck slide on a 83 that fell flat at 3k.
The idle jets do just a bit more than set idle mixture too.Not much tho.
iffin I had to guess about this,it's ported to 3 small offset holes at the beginning of the throttle plate and supply fuel from idle to around 1500 rpm or so.and remain for the duration supplying a bit of fuel.Above the 1500 area the main jet kicks in.This should't be a issue on your bike.

87goldaspy
Posts: 12
Joined: Sun Aug 16, 2015 11:15 pm
Location: Saltville, VA
Motorcycle: 1987 GL1200 Aspencade

Re: 1987 1200 Aspencade Bogging

Postby 87goldaspy » Fri Sep 18, 2015 11:02 am

Ok finally getting back to the goldwing after moving. I did pull the caps out and checked the screw settings. 1,2, and 3 were 3 1/4 and 4 was 2 3/4. I dialed them in with a vacuum gauge and resynced the carbs just to have the same result. As far as the slides I am not sure that they are working correctly because I put the screens back inside of the air box and can't see them but it does have a fluttering sound when it starts bogging. Slides jumping maybe? I am stumped on this one.




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