GL1100 carb tuning


Information and questions on GL1100 Goldwings (1980-1983)
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Kama
Posts: 34
Joined: Fri May 25, 2012 8:33 pm
Location: Lone Grove, Oklahoma
Motorcycle: 1980 Honda Goldwing GL1100

GL1100 carb tuning

Postby Kama » Wed Jul 04, 2012 2:52 am



I'm in the process of bringing back to life my grandfathers '80 GL1100. I recently finished up all the brake work and had it running but wouldn't idle. Pulled out the carbs and rebuilt and now it idles like a champ. Now I'm not a novice carb person but this is my first 4 carb system and my first cruiser to work on (I raced atv's and did all of my own carb work and could almost perfectly match a dyno test with all of the jetting on both 1 and two carb setups). Now, with that said, when I'm on the road and I punch it off from first and go through all the gears it feels like its running great. But if I'm cruising along in a gear (3rd, 4th, or 5th) at lower RPM's (2-2.5k) and try it air it out it feels as though it's getting too much fuel and is sluggish til the RPM's catch up. My grandfather thinks its because of the gearing and that it's ok and some gears are tall to save fuel consumption (he rode it 20 years before parking it so I respect his opinion on it). Since I'm used to tuning racing machines and not street cruisers, I just wanna verify that is why and it's not an overly rich main fuel jet. I'd like to get all the adjusting done now if it's needed while as I'm soon to replace the throttle cables and will have the carbs loose again.



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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: GL1100 carb tuning

Postby virgilmobile » Wed Jul 04, 2012 10:39 am

Before you go too far,stick a mirror in the plenum box and look at each slide as you rap the throttle.
Verify that each slide pops up.I did have a sticky one that dragged the engine back a bit.This was after I "rebuilt" the carbs.Now I static test each one on the bench with a shop vac.
Also,a really good sync makes a difference in the 850-1800 rpm range.Stops the rattling.
My tool is shown in a post.....Search $25 vacuum sync.

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Kama
Posts: 34
Joined: Fri May 25, 2012 8:33 pm
Location: Lone Grove, Oklahoma
Motorcycle: 1980 Honda Goldwing GL1100

Re: GL1100 carb tuning

Postby Kama » Wed Jul 04, 2012 10:51 am

Ok, I'll check that out this afternoon. Thanks!

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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: GL1100 carb tuning

Postby virgilmobile » Wed Jul 04, 2012 2:50 pm

If everything looks ok,run it a bit and look at the plugs.Sooty plugs indicate a rich fuel mix.

bbells
Posts: 42
Joined: Sat Jun 23, 2012 7:54 pm
Location: Minneapolis, Minnesota
Motorcycle: 1982 GL1100 Aspencade

Re: GL1100 carb tuning

Postby bbells » Wed Jul 04, 2012 6:45 pm

IMHO:
Please be aware that if you are used to 2 cylinder bikes and recently switched to a 4 cylinder that the 4 cylinder does not have the torque of a twin. You have these 4 small pistons going up and down vs the 2 heavy pistons. This is why 4 cylinders are designed to run at a higher rpm. Mine is happiest at 3500+. Anything below that there just isn't enough torque to give the engine the power you need to not bog down.

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WingAdmin
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Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: GL1100 carb tuning

Postby WingAdmin » Thu Jul 05, 2012 1:16 pm

bbells wrote:IMHO:
Please be aware that if you are used to 2 cylinder bikes and recently switched to a 4 cylinder that the 4 cylinder does not have the torque of a twin. You have these 4 small pistons going up and down vs the 2 heavy pistons. This is why 4 cylinders are designed to run at a higher rpm. Mine is happiest at 3500+. Anything below that there just isn't enough torque to give the engine the power you need to not bog down.


Of course, then there's the 1500, which has six pistons even smaller than the 4 cylinders, a very low redline (for a motorcycle) of 5,500 RPM, and huge torque available right from idle. :)

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Kama
Posts: 34
Joined: Fri May 25, 2012 8:33 pm
Location: Lone Grove, Oklahoma
Motorcycle: 1980 Honda Goldwing GL1100

Re: GL1100 carb tuning

Postby Kama » Thu Jul 05, 2012 1:30 pm

Thanks guys, I really appreciate all the input. I've come to the conclusion that I am just slightly rich on the main as the plugs are slightly sooty. I've been sidetracked by a thermal switch issue so I have not been able to adjust to confirm, and now I'm waiting for orings to stop a coolant drip. Gotta love restorations! :)

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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: GL1100 carb tuning

Postby virgilmobile » Thu Jul 05, 2012 2:44 pm

WingAdmin wrote:
Of course, then there's the 1500, which has six pistons even smaller than the 4 cylinders, a very low redline (for a motorcycle) of 5,500 RPM, and huge torque available right from idle. :)


And that torque will scare the bejeezers out of you,especially when the bike burps a little in a slow turn on a bit of gravel.I all but lost it right there in front of God and 35 cars.

I'm working on that now.

User avatar
Kama
Posts: 34
Joined: Fri May 25, 2012 8:33 pm
Location: Lone Grove, Oklahoma
Motorcycle: 1980 Honda Goldwing GL1100

Re: GL1100 carb tuning

Postby Kama » Thu Jul 05, 2012 11:28 pm

Update:

Got a few free hours today so I decided to tackle the carbs. Got them out and on the bench and did a few tests I forgot to do after the rebuild and all passed perfectly. Then went from the stock 145's to 140's and NOW it's running like the old Goldwing I remember as a kid. As you guys said no neck breaking torque but it picks up speed much smoother when given more throttle and I don't feel as though I'm having to baby it into the higher rpm's when passing a speed limit sign. Much happier now. Again, thanks for all of the advice! I'm def learning it's a new machine but all the same concept. A few more minor details and it'll be time to take the magnifying glass off it and ride!




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