Vacuum advance problem


Information and questions on GL1000 Goldwings (1975-1979)
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deerhunter80
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Vacuum advance problem

Postby deerhunter80 » Tue Mar 09, 2010 1:00 am



my mechanic mentioned something about a sluggish response to the throttle. he said my vacuum advance needed to be adjusted and when i come up with some more money he could fix it. A)wat is a vacuum advance and B) is this something i could fix and save me some money?



Old Fogey
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Re: Vacuum advance problem

Postby Old Fogey » Wed Mar 10, 2010 2:33 pm

He's a clever boy if he can fix the vacuum advance on a GL1000! It hasn't got one! The 1100 has.

If the timing is not advancing, it's down to the automatic advance retard mechanism bob weights sticking. If it's not retarding, the small return springs are shot.
This unit is located at the back of the points plate on the left hand head.


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Re: Vacuum advance problem

Postby WingAdmin » Wed Mar 10, 2010 8:20 pm

Old Fogey wrote:He's a clever boy if he can fix the vacuum advance on a GL1000! It hasn't got one! The 1100 has.


I love it! Hopefully his mechanic was speaking out of ignorance rather than malice. Neither of them is good, though.

deerhunter80
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Re: Vacuum advance problem

Postby deerhunter80 » Fri Mar 12, 2010 12:09 am

here's another thinker. the previous owner took to stock points out and replaced them with electronic points. maybe i shouldve stessed that when i asked my first question? idk im new to the mechanic stuff i do mainly paint, body and suspension

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78AzWing
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Re: Vacuum advance problem

Postby 78AzWing » Sat Mar 13, 2010 3:19 pm

I would think sluggish throttle response on our '78's would be more likely to be carburetion, probably carb syncing if you are still running the stock carbs. Or they need a small bit of cleaning. Running SeaFoam through them (Sorry Oldfogey) will help keep them clean.
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Old Fogey
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Re: Vacuum advance problem

Postby Old Fogey » Sun Mar 14, 2010 1:21 am

78AzWing wrote:I would think sluggish throttle response on our '78's would be more likely to be carburetion, probably carb syncing if you are still running the stock carbs. Or they need a small bit of cleaning. Running SeaFoam through them (Sorry Oldfogey) will help keep them clean.


I would think you are probably right on it being carbs. It seems the mechanic thought it was timing, but I wouldn't be trusting that mech to tie his shoelaces correctly!
Even with the Dyna(?) fitted, it could still be wrongly timed; and if it's been sitting a while the rings could have gummed up, in which case it will get better as you get some miles on it. If that is the case, SeaFoam in the tank, an oil and filter change, then take it out and BLAST it some!
Just a thought. It sounds to me as though this is a 'new-to-you' bike? If so, DO NOT do the above until the timing belts have been changed. These are interference engines and trust me, you really don't want a belt to let go!

Check out this thread on NGW for everything that you need to know as a new-2-wings owner.
http://www.ngwclub.com/forum/viewtopic.php?t=13133
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deerhunter80
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Re: Vacuum advance problem

Postby deerhunter80 » Sun Mar 14, 2010 3:00 pm

i havent checked the timing belt yet but i will tomorrow. i just rode the bike to Mississippi and back. about 500 miles. in the cold and rain. i will check the condition of the belt when i pull the covers off. ar as timing it goes. ill need to save some money for one. as far as the carbs are. i just pulled them, and cleaned all sorts of trash out, mainly rust. i used Seafoam in the tank when i first started the bike. but when i pulled the carbs off and apart i noticed that they had been rebuilt recently because everything looked new in them. im used to working on Harleys so this is my first rice burner i get to play with. i thank the community on here for helping me and keepiing me on target so i can keep riding this beautiful machine.

Old Fogey
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Re: Vacuum advance problem

Postby Old Fogey » Sun Mar 14, 2010 3:17 pm

You will have to take this on trust, but you will NOT be able to tell anything about the timing belts by looking at them !!!!

If you don't know FOR SURE the history of them, get them changed. NOW!
This is definitely not an area to be trying to save money on. If a belt lets go, at best you are looking at a head removal and new valves. At worst, you will be looking for a new motor!

A mate of mine last year went 400 miles (and back) to pick up a GL1000. Took it 1/4 mile down the road at his home and destroyed the engine big time when a belt went.

I have just bought a nice 78. The PO couldn't tell me when the belts had been done; I wouldn't let him even start it!. And as I'm still waiting for new belts to arrive, it still hasn't been started.
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

deerhunter80
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Re: Vacuum advance problem

Postby deerhunter80 » Sun Mar 14, 2010 3:28 pm

well me da always said (since we are Irish immagrints), never trust a Scotsman, but on this occassion i think i will trust you. I wont start the bke again until i have a new timing belt on it.

Old Fogey
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Re: Vacuum advance problem

Postby Old Fogey » Sun Mar 14, 2010 3:36 pm

deerhunter80 wrote:well me da always said (since we are Irish immagrints), never trust a Scotsman, but on this occassion i think i will trust you. I wont start the bke again until i have a new timing belt on it.


Good job I'm English then! :lol: :lol:

Frenchy and Susan at Crescent Moon will soon sort you out with a PAIR of belts. Just scroll down the page to the Gates Belts.

http://www.crescentmoonunlimited.com/ht ... 10006.html

(they're good people to know, very helpful.)
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

deerhunter80
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Re: Vacuum advance problem

Postby deerhunter80 » Sun Mar 14, 2010 5:20 pm

ya had to send me to a page with the Coward's flag didnt ya? lol for 800 years my family fought those Black and tan scum till they agreed to give us half our country. well if ur English then heres a bit of Eire for ya Tiocfaidh ar la Erin go bragh

deerhunter80
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Re: Vacuum advance problem

Postby deerhunter80 » Sun Mar 14, 2010 7:16 pm

im just noggin u Old Fogey. May we raise a glass of stout for our dear old land and God save our liver!

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Re: Vacuum advance problem

Postby WingAdmin » Mon Mar 15, 2010 10:01 am

Just like he said, belts that look perfectly fine can let go tomorrow. Timing belts are designed not to stretch AT ALL, because that would affect the timing, Because they don't stretch, they don't crack and age the way regular serpentine belts do. It's misleading, because a very old timing belt won't have cracks or any of the normal indicators of a belt's life or condition.

If you don't know the age of the belts, it's time to change them now, before you ride again.

deerhunter80
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Re: Vacuum advance problem

Postby deerhunter80 » Wed Mar 24, 2010 12:46 pm

thanks all i changed the timing belt and found it to not b in time. plus as soon as i pulled it off it fell apart

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78AzWing
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Re: Vacuum advance problem

Postby 78AzWing » Wed Mar 24, 2010 12:50 pm

You did replace both, right?
If one did that the other will be right behind it.
Meddle not in the affairs of Dragons
For thee are Krunchie and taste goode with Ketchup!

deerhunter80
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Re: Vacuum advance problem

Postby deerhunter80 » Thu Mar 25, 2010 10:32 am

yes i replaced both.




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