Gear noise....chain noise?


Information and questions on GL1200 Goldwings (1984-1987)
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twocams
Posts: 554
Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Gear noise....chain noise?

Postby twocams » Mon Aug 15, 2016 7:31 pm



I hear a gear rattling or maybe a chain rattle. But only when I decelerate, maybe coming down a hill coasting. just for a couple min. until the engine catches up? Its not all the time, just when the time is right.There are other drive train noises but with earplugs in most are gone. :shock: The transmission whine is still there but it dont bother. Any Ideas. 31,000 miles, 85 Aspencade.

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CrystalPistol
Posts: 261
Joined: Wed Mar 10, 2010 9:07 pm
Location: Shenandoah Valley of Virginia
Motorcycle: 1985 GL1200A
1997 GL1500SE Lehman Trike

Re: Gear noise....chain noise?

Postby CrystalPistol » Mon Aug 15, 2016 7:58 pm

Sounds like a bike that will deliver many many years of riding enjoyment.
I hear a gear rattling or maybe a chain rattle. But only when I decelerate, maybe coming down a hill coasting. just for a couple min. until the engine catches up?
I have an '85 that I've had 21 years now and I haven't a clue what it is you describe?
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User avatar
twocams
Posts: 554
Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: Gear noise....chain noise?

Postby twocams » Mon Aug 15, 2016 8:40 pm

Thanks Pistol,

I wasn't going to lose any sleep over it. But thought maybe someone had a gear rattle or something like that. ill just keep my ear plugs in and turn up the radio. :roll: Kick back and enjoy the ride.

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CrystalPistol
Posts: 261
Joined: Wed Mar 10, 2010 9:07 pm
Location: Shenandoah Valley of Virginia
Motorcycle: 1985 GL1200A
1997 GL1500SE Lehman Trike

Re: Gear noise....chain noise?

Postby CrystalPistol » Tue Aug 16, 2016 3:33 pm

Well .... my point was the description of the noise ...

I tried to imagine a noise going down hill for a couple minutes until the engine caught up.

Sorry ..... :?
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User avatar
twocams
Posts: 554
Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: Gear noise....chain noise?

Postby twocams » Tue Aug 16, 2016 9:32 pm

Just didnt know how else to explain the noise. Sounds like a gear rattle. Like if two gears were mated to each other and turning on the same shaft. As they were turning at the same speed they are just moving together with no noise. But as shaft slows down one of the gears is shuttering in the teeth of the other one.
Boy thats worser. Ill shut up now. :(

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CrystalPistol
Posts: 261
Joined: Wed Mar 10, 2010 9:07 pm
Location: Shenandoah Valley of Virginia
Motorcycle: 1985 GL1200A
1997 GL1500SE Lehman Trike

Re: Gear noise....chain noise?

Postby CrystalPistol » Wed Aug 17, 2016 9:48 am

There is "slack" in the bikes drive train, we call it "clearance" and it's built in for "tolerance" but in use, it creates "slack". Set your bike on the center stand, engine off. Put in first gear, rock rear wheel. Try same thing in 2, 3, 4, and 5 gear. The slack in the drive train as viewed in rear wheel free rotation will change, but it's always there. Changing gears brings in different elements and it changes the multiplication of some slack with gear ratio changes themselves. There is clearances at every pair of gears mesh points, gears on splined shafts, drive shaft to U-joint, U-joint to output shaft clearances, final drive ring & pinion backlash, and a spring loaded drive cushion that is like a v ane being pushed into bottom of a big "U" under no load and it too can move across the bottom of that U fairly easily, but as it moves it starts trying to climb ever steeper sides which is where the cushioning effect comes in, it can't climb out as the sides are parallel with the shaft.

Perhaps you are talking about that narrow spot in the throttle where the engine rpm is matched to road speed in that gear so closely that there is no acceleration applied and no retarding force either. You can feel the slack then sometimes.

If a tick like noise .... might want to check that rear wheel and the bearing on the drive side.


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