Carb. Sync. Question: Help me guys!!


Information and questions on GL1100 Goldwings (1980-1983)
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nickgroves0308
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Motorcycle: 1982 Honda GL1100 Gold Wing

Carb. Sync. Question: Help me guys!!

Postby nickgroves0308 » Wed May 04, 2011 7:39 pm



I have an 82' 1100. I rebuilt the carbs, fork seals, calipers, etc... last year when I got the bike. I've put about 3k miles on it since then, having only bench synced the carbs. She idles great and runs well but I have always had that primary chain rattle that's so common with these bikes when the cylinders are not exactly balanced. Additionally, some very minor hesitation on take off. She needs a carb sync.

So, I went out and got the neccessary bits to sync my carbs. I am using the single vacum gauge system with an adjustable aquarium valve per the DIY article on this forum. I am having a hell of a time getting the gauge to read the same even just starting; going from cyl. 3 reading (baseline) to the reading on cyl. 1. When I adjust the carb screw on cyl. 1 I get a very high rev one way and then the engine almost dying going the other way...all the while never getting close to the same reading on the vacum gauge as cyl. 3. And I am getting a lot of hanging throttle too.

Question: Assuming all else is well with, compression, ignition, and so on...what's the correct way to adjust the fuel/air mix screw as well as the carb sync screws to achieve a smooth running engine? How do you know how much to turn what screws; in particular, the fuel/air mixture screws? I thought the fuel/air mix (idle jet) screws all were to be at the same adjustment...lightly seated and 2.5-3 turns out.

I should've been happy with what I had but I know my wing wasn't at her full potential so I couldn't help myself. And the rattle was killing me.

Thanks guys.



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virgilmobile
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Re: Carb. Sync. Question: Help me guys!!

Postby virgilmobile » Wed May 04, 2011 7:51 pm

I just went thru that same problem.I bought 2 vacuum gauges(same type)tested them for the same readings(they were very close).I hooked both the right cylinders first.I had to mess going between the adjuster and idle setting get it right.Then the same on the left side.finally between left and right(rear cyl) to balance it out.

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MJSantos
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Re: Carb. Sync. Question: Help me guys!!

Postby MJSantos » Wed May 04, 2011 8:01 pm

Your correct with the initial mixture setting of 2.5-3. The sync adjustments are very sensitive. Set your idle at 1K then take your reading off of #3. Move to #1 and turn ever so slightly let it settle down then adjust again. MAINTAIN the 1K idle. If it changes the vacum on #3 is going to change (Base Reading). If that changes and your trying to adjust #1 to your original reading it will throw it off even further. Once you get #3 & #1 the same then move to matching #2 to #4, don't worry about getting them matched to #3/#1 but balanced to each other. The last part will be to match #4 to #3, Again make sure the idle is still at 1K. During the entire process it will move up and down on you. Once you have gone thru this then you can adjust the fuel mixture screws.

nickgroves0308
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Re: Carb. Sync. Question: Help me guys!!

Postby nickgroves0308 » Thu May 05, 2011 3:45 pm

It appears I've got the carbs pretty well synced up. The bike runs a lot smoother and starts (cold) easily with no choke at all. I do still get some primary chain rattle when it's under load (actually driving/accelerating) but it's less then before. I'm happy enough with it where it is.

Now for those fuel/air mixture screws...How do you know where to adjust them so they are set to their correct position for each carb? (aside from the standard, seated then 2.5 to 3 turns out from lightly seated) I guess I'm asking is there a precise method of measuring their reading? Also, will adjusting them effect (in a negative way) my now snyced carbs?

Thanks in advance, you guys are awesome.

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WingAdmin
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Re: Carb. Sync. Question: Help me guys!!

Postby WingAdmin » Fri May 06, 2011 2:24 pm

If you can get your hands on a digital tach, it will go a long way to help get an accurate sync. Any change in the engine RPM will change the vacuum enough as to throw off the very sensitive carb sync vacuum readings.

I don't have one...but maybe I NEED one. :) (Saying I "need" xxxx tool in order to fix yyy is a great way to justify new tool purchases to my wife!)

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HALBUDD
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Re: Carb. Sync. Question: Help me guys!!

Postby HALBUDD » Fri May 06, 2011 3:56 pm

WingAdmin I think after buying your wife a bike and teaching her to ride,now you can tell her that you need new tools to work on HER!! bike. Ill bet she will let you get anything. I baught the motion pro sync tool works great synced both bikes and they both run better. Hal
A woman that can use tools is worth her weight in gold !!

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littlebeaver
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Re: Carb. Sync. Question: Help me guys!!

Postby littlebeaver » Fri May 06, 2011 4:11 pm

WingAdmin wrote:If you can get your hands on a digital tach, it will go a long way to help get an accurate sync. Any change in the engine RPM will change the vacuum enough as to throw off the very sensitive carb sync vacuum readings.

I don't have one...but maybe I NEED one. :) (Saying I "need" xxxx tool in order to fix yyy is a great way to justify new tool purchases to my wife!)

23 years experience with my wife and I just tell her what she tell's me..."It was on sale." :lol: ..

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littlebeaver
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Re: Carb. Sync. Question: Help me guys!!

Postby littlebeaver » Fri May 06, 2011 4:14 pm

HALBUDD wrote:WingAdmin I think after buying your wife a bike and teaching her to ride,now you can tell her that you need new tools to work on HER!! bike. Ill bet she will let you get anything. I baught the motion pro sync tool works great synced both bikes and they both run better. Hal

I bought that too, [motion pro] it works excellent..

nickgroves0308
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Re: Carb. Sync. Question: Help me guys!!

Postby nickgroves0308 » Fri May 06, 2011 5:18 pm

Thanks Wingadmin. Remember...happy wife, happy life. Or so I'm told. Thanks again.

Question: Are there any DIY articles on rebuilding/replacing the clutch on this site? I think that's my next project, as I have run out of adjustment at the lever. How will I know when I absolutely need to do a clutch overhaul?

Nick

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WingAdmin
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Re: Carb. Sync. Question: Help me guys!!

Postby WingAdmin » Sat May 07, 2011 9:41 pm

littlebeaver wrote:23 years experience with my wife and I just tell her what she tell's me..."It was on sale." :lol: ..


Yup, we both tell each other that one ALL the time. :) We both know it's BS when the other one says it, but I think we just agree to pretend to ignore that fact. :)

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

Re: Carb. Sync. Question: Help me guys!!

Postby WingAdmin » Sat May 07, 2011 9:44 pm

nickgroves0308 wrote:Thanks Wingadmin. Remember...happy wife, happy life. Or so I'm told. Thanks again.

Question: Are there any DIY articles on rebuilding/replacing the clutch on this site? I think that's my next project, as I have run out of adjustment at the lever. How will I know when I absolutely need to do a clutch overhaul?


I haven't had to do a clutch yet, so I haven't got an article made on it yet. If you can get the clutch to slip with hard acceleration when the lever is fully out, it's a pretty good sign that your clutch has had it. As for running out of adjustment, it could be just a stretched cable. Cables are cheap, and easy to install. You could buy a new one, put it in and keep the old one on hand as an emergency spare. It might solve your problem.

nickgroves0308
Posts: 17
Joined: Wed Apr 14, 2010 8:47 pm
Location: Oak Lawn, IL
Motorcycle: 1982 Honda GL1100 Gold Wing

Re: Carb. Sync. Question: Help me guys!!

Postby nickgroves0308 » Sun May 08, 2011 9:59 pm

Thanks Wingadmin. As always, you have answered my many questions. You are really great man. Thanks again.




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