85 GL1200 Hesitation/Stumble at low RPM. - Page 3 - Steve Saunders Goldwing Forums

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post #21 of 31 (permalink) Old 06-26-2019, 04:48 PM Thread Starter
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Location: Elgin, IL
Year: 1985
Make: Honda
Model: GL1200A
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Originally Posted by Bike...and Dennis View Post
I think you can do all 4 without removing the carbs. Don't count on the shims helping anything. They didn't on mine.

I've seen people say it does nothing at all and some that say it's the greatest thing since sliced bread. It should be simple enough to try though, if I have time to get to it. Worst case, just pull the slides again and remove the shims.


I'll also look into ditching the paper filter - I'm not sure just how old it is, clean-ish or not.
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post #22 of 31 (permalink) Old 06-26-2019, 05:06 PM
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Paper is fine, for now. The problems the 12s have with air is usually too much of it when a foam filter is used.

Why ain't we ridin'?
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post #23 of 31 (permalink) Old 06-26-2019, 06:06 PM Thread Starter
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Originally Posted by Bike...and Dennis View Post
Paper is fine, for now. The problems the 12s have with air is usually too much of it when a foam filter is used.

I'll roll with it this season and add it to the service list at the end of the year, unless I come across one in my travels.


Not really my lucky day - nothing but stop and go traffic the entire way home and I just had a parts order finally come in with required goodies for my NT700 and the clutch cable I ordered is missing.


Oh well, what's life without hiccups.
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post #24 of 31 (permalink) Old 06-26-2019, 06:49 PM
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Yes, you can do all four while still on the bike. On my 86 Aspy, It would pop & backfire at low RPMs. Shimming cured that.

Carl

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NASSIR 6 - NASSIR 7
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post #25 of 31 (permalink) Old 06-27-2019, 06:17 PM
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Location: Lehigh Valley, PA, USA
Year: 1987
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Originally Posted by Bike...and Dennis View Post
OEM jets are expensive. Aftermarket jets are junk.

Cleaning the ones you have isn't that difficult.

That's been my experience too. I bought some non-OEM jets and they didn't even standup to installation. Most items are on older bikes are strictly OEM for me - not limited to jets and gaskets of all kinds. YMMV
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post #26 of 31 (permalink) Old 06-28-2019, 09:53 AM
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Hi Kelly, In my opinion you are doing the right move with Seafoam. I use it every tank on my 85 Aspy. Your bike with 58k miles is running lean. There may be dirt in the carbs (likely if it sat with unprotected fuel in the carbs), but 1st you must do a carb balance with mixture screw adjustment. The mixture screw controls idle AND off-idle fine fuel adjustments. Adding a shim to the metering rods and up sizing the jets will also fix this lean condition, but if you haven't changed the stock exhaust there is no reason for making these changes. Take up the offer from Rockford to balance the carbs (very important) and make sure to set the mixture screw as well (procedure in repair manual). Best of luck.
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post #27 of 31 (permalink) Old 06-29-2019, 11:54 AM Thread Starter
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Originally Posted by GL 1200A View Post
Hi Kelly, In my opinion you are doing the right move with Seafoam. I use it every tank on my 85 Aspy. Your bike with 58k miles is running lean. There may be dirt in the carbs (likely if it sat with unprotected fuel in the carbs), but 1st you must do a carb balance with mixture screw adjustment. The mixture screw controls idle AND off-idle fine fuel adjustments. Adding a shim to the metering rods and up sizing the jets will also fix this lean condition, but if you haven't changed the stock exhaust there is no reason for making these changes. Take up the offer from Rockford to balance the carbs (very important) and make sure to set the mixture screw as well (procedure in repair manual). Best of luck.



Thanks for the input, I will take it to heart.



Took the day off the internet yesterday for my annual celebration of completing another rotation around the sun (ie, the dreaded birthday).



I've officially run one tank thru the bike now and filled up again on Thursday, along with another half can of Seafoam. I ended up with 38 and change MPG on the first tank, but keep in mind that I end up in a lot of stop and go on the tollway (pay to sit) punctuated by periods of running it up to 80 and then repeating - so I can't really complain so far. The only thing I can say about a full-fairing bike in the sun but whew man those legs get hot.


My present to myself was a new windscreen to replace the ruined original. I'm glad I did swap it, because I found several cracked off pieces under the front shroud. So now I'll be able to see through the screen AND I grabbed a vented one, so I can get some airflow. I'm probably more excited about that than I should be.


EDIT: Oh, just a touch more info - warm idle is around 1150. I see Honda stated 1000 +/- 100 in the manual so I don't think this seems out of line by much. Might be worth adjusting slightly with a carb sync.

Last edited by Virto; 06-29-2019 at 02:17 PM.
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post #28 of 31 (permalink) Old 07-06-2019, 09:32 PM Thread Starter
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Little update, since I don't like letting threads die out without updates or conclusions -



I managed to find the time to meet up with Carl and accept his beyond gracious offer of taking a look at the bike and going over some things with me.


First order of business was a compression check, which went well, with a range of 140-145. The carb sync went similarly well, with everything very close together as they were, but with room for some tweaking and idle speed adjustment. Afterwards we did some cruising and, in my opinion, had an awesome time.



I will say, I'm jealous of the torque the 1500 puts out. I had to downshift the 1200 to keep up on hills.


In all, I put around 300 miles on the bike today and she ran like a top. I'll have to see how it behaves when it's cold, yet, but there's time for that to come.


Now I'll be searching for threads on exhaust gaskets. My hot feet make me think there's a leak at the flange, and Carl noted that he heard me coming - I might think the bike is quiet compared to what I'm used to, but there's probably room for improvement.
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post #29 of 31 (permalink) Old 07-07-2019, 11:37 AM Thread Starter
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Well, I gave the exhaust the old soapy water treatment expecting to find somewhere blowing bubbles, but I didn't find anything at all. She burns the water off pretty quickly, but doesn't blow it off anywhere I could see.
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post #30 of 31 (permalink) Old 07-08-2019, 06:42 AM
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Quote:
Originally Posted by Virto View Post
Little update, since I don't like letting threads die out without updates or conclusions -



I managed to find the time to meet up with Carl and accept his beyond gracious offer of taking a look at the bike and going over some things with me.


First order of business was a compression check, which went well, with a range of 140-145. The carb sync went similarly well, with everything very close together as they were, but with room for some tweaking and idle speed adjustment. Afterwards we did some cruising and, in my opinion, had an awesome time.



I will say, I'm jealous of the torque the 1500 puts out. I had to downshift the 1200 to keep up on hills.


In all, I put around 300 miles on the bike today and she ran like a top. I'll have to see how it behaves when it's cold, yet, but there's time for that to come.


Now I'll be searching for threads on exhaust gaskets. My hot feet make me think there's a leak at the flange, and Carl noted that he heard me coming - I might think the bike is quiet compared to what I'm used to, but there's probably room for improvement.

As far as downshifting goes, I just kept it in fourth gear.

Carl

Honorary Rhino


NASSIR 6 - NASSIR 7
NASR 10 - NASR 11
NASR 12 Host in Galena

old bikes:
71FX Super Glide
86 Aspencade
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