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Hi everyone,

As stated in the subject, this is my first post. A little background on myself first. I am a 27 year veteran of the automotive service industry and the Master Certified Diagnostic Specialist at the local Lexus Dealership. If this can be of help to anyone on the board, please feel free to ask at any time. Now down to Goldwing business.

Approximately a year ago, I purchased a 1981 GL1100 that had been sitting for about 15 years. I started a frame up restoration at that time and am almost ready to ride. One snag along the way. I went through the engine with a fine tooth comb and miked all clearances and repaired as necessary. Everthing was well within factory tolerances according to my service manual. New rings, new bearings, everything fresh. Upon the first firing, when the engine settled down to idle, I hear this ominous thump emanating from the crankcase. Sounded just like a main bearing knock from an car engine, present at idle and goes away under load or higher rpm. How could this happen? I have built enough car engines to fill a warehouse and never had one knock. So I studied and listened for awhile. I have a friend who has a 2003 Goldwing. His didn't make this noise. I tried my best to locate someone with a 4 cyl Wing so I could compare. Being in the auto industry, I know certain engines have peculiar noises that are inherent in their design. Not being able to locate a 4 cyl, I pulled the eng back down, just to double check. On reinspection and finding nothing out of whack, I put her back together. Fired it up, same noise. I listened very carefully with an electronic stethoscopeand have tenatively diagnosed the noise as coming from the primary drive chain. Then I stumbled on this forum. If only I had found you first. Would have saved a lot of labor hours and worry about my project and I would be riding already. I have found the forum to be very informative and interesting. I will upload pics at a later date.

Doug
 

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Hello Doug and welcome to the board. :waving:I've heard of the big hyvochain rattling on the 1100 Wing, but I can't say that I've ever heard of one making a thumping sound (don't know what mileage is on yours). Is there a chance that this noise might be coming from the clutch area?
 

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Doug,

Welcome to to the best Goldwing forum on the net. Sounds like you already have more experience than some of the "Gurus." Congrats on rebuilding that old Wing. Too many people are breaking them for parts and selling on ebay.
 

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Welcome to the best Goldwing site on the planet Doug, sounds like you will be a invaluable source of information, and you will find info here that can't be found else where. Enjoy.
 

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BRowan wrote:
Hello Doug and welcome to the board. :waving:I've heard of the big hyvochain rattling on the 1100 Wing, but I can't say that I've ever heard of one making a thumping sound (don't know what mileage is on yours). Is there a chance that this noise might be coming from the clutch area?
My GL1000 makes the same noise... nothing to worry about if it goes away at higher RPM. A way to minimize it is to keep the bike well tuned up. Ignition timing has the biggest effect.
 

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BRowan wrote:
Hello Doug and welcome to the board. :waving:I've heard of the big hyvochain rattling on the 1100 Wing, but I can't say that I've ever heard of one making a thumping sound (don't know what mileage is on yours). Is there a chance that this noise might be coming from the clutch area?

BRowan,

I described it as a thump, could be described as a rattle or knock. Some information I didn't include because I didn't want my first post too long. I adjusted the carbs using the Idle drop method in the manual, followed that using a 5 gas analyzer. Then I synched the carbs using a mercury manometer and the noise has nearly disappered. By the way, it has a little under 29,000 miles on it. Sounds great now.

Thanks

Doug
 

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Hi Doug, welcome to this excellent community. The sound you are describing is primary chain rattle. These bikes develop inherent slack in the primary drive chain which is audible at idle, and disappears as rpms rise and the slack is taken up. Nothing to worry about. Bikes can rattle like hell at idle and rev like rheostats at higher rpm. The guys are right about ignition/carb synch to avoid low rpm knocks on takeoff. These bikes are really very forgiving when tuned properly. Just ride! Make sure the rear splines are lubed in the final drive next time the rear wheel is off, and of course that you do the timing belts as these are interference engines!
 

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mag wrote:
Hi Doug, welcome to this excellent community. The sound you are describing is primary chain rattle. These bikes develop inherent slack in the primary drive chain which is audible at idle, and disappears as rpms rise and the slack is taken up. Nothing to worry about. Bikes can rattle like hell at idle and rev like rheostats at higher rpm. The guys are right about ignition/carb synch to avoid low rpm knocks on takeoff. These bikes are really very forgiving when tuned properly. Just ride! Make sure the rear splines are lubed in the final drive next time the rear wheel is off, and of course that you do the timing belts as these are interference engines!

mag,

Sounds like you have encountered the same things that I have. The final driven flange splines were about 25% worn off. The drive flange in the diff wasn't quite so bad. Flange has been replaced. When I first obtaine the Wing, the previous owner must have tried to do the t-belts himself. He put the rt side cam gear on backwards, bent a lot of valves. Several of the Lexus engines I work on for a living are interference engines, so I am very aware of the dangers. Thanks for the cautions.

Doug
 
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Hey wilddoug :waving:Welcome to the Greatest Goldwing Forum on the net. :clapper:

:weightlifter::18red::weightlifter:
 

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Welcome Aboard " Wilddoug" looks like you found the problem (Carbs) good deal!

Run a little "MMO" Marvel Mystery Oil in every other tank of gas to keep those carb in good shape, most of us do !

And buy an "Opossum" horn for those Kentucky roads!:goofygrin:
 

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Welcome to a great Goldwing site. I am sure you will love it. Post a picture when you get your bike on the road .:cheeky1:
 

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mag wrote:
Hi Doug, welcome to this excellent community. The sound you are describing is primary chain rattle. These bikes develop inherent slack in the primary drive chain which is audible at idle, and disappears as rpms rise and the slack is taken up. Nothing to worry about. Bikes can rattle like hell at idle and rev like rheostats at higher rpm. The guys are right about ignition/carb synch to avoid low rpm knocks on takeoff. These bikes are really very forgiving when tuned properly. Just ride! Make sure the rear splines are lubed in the final drive next time the rear wheel is off, and of course that you do the timing belts as these are interference engines!
Mike,

About this primary chain rattle and it's relationship with carb sync; I've got an '83 GL11I with over 113K miles; paid for a carb rebuild and still saw no change in this phenomenom. I thought I had a pretty good mech cause he's retired Honda M/C Tech; but he's an old Korean War Vet too, suffers alot of pain from a war injuryand I've witnessed him bein'cranky.

He acted like he had no clue what this noise was, even after I quizzed him 'bout it. You think this carb work could be suspect?

BikeKnight52
 

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greeting, the 1100's thump from the primary, and it sounds just like a knock. as soon as the rpm's come up, it goes away. syncronizing the carborators will make a huge difference. my 1100 has been doing it for years. good luck with your 81, i love mine. ron
 

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I love it when a 3 year old thread gets resurrected and brought back to life.

And all of the info is still just as pertinent as it was 3 years ago.

Shows that the Search Engine is doing a great job :)
 

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The carb synch was the first thought when I read your question. I had the same th8ump on mine and after a carb synch most went away, The rest of the thump cleared after running 500 mile of seafoam fuel.
Do you also hear a squeal and thumpoing get worse as your first take off?
This is what I heard and it was quite embarrasing when everyone thinks your damaging your bike as you take off.
 
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