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Old 01-01-2013, 08:52 PM   #1
viz OP
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Driveline Backlash 2010 GSA

I have noticed recently that the driveline backlash on my 2010 GSA seems to be increasing - stick it in 1st gear on the main stand and rocking the rear wheel back and forth produces about 2"+ of movement with quite a hefty clunking noise which seems to be coming from within the gearbox rather than the actual driveshaft or surrounds. This clunking noise is also heard throttling back and forth, especially in the low gears. Bike has just turned over 45,000 km (27,000 miles). Everything else is normal, gearbox smooth as silk; bike is meticulously serviced.

When manoeuvring slowly it is a pain - much like a slack chain. Normal? Within tolerance?

viz
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Old 01-01-2013, 09:28 PM   #2
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Quote:
Originally Posted by viz View Post
I have noticed recently that the driveline backlash on my 2010 GSA seems to be increasing - stick it in 1st gear on the main stand and rocking the rear wheel back and forth produces about 2"+ of movement with quite a hefty clunking noise which seems to be coming from within the gearbox rather than the actual driveshaft or surrounds. This clunking noise is also heard throttling back and forth, especially in the low gears. Bike has just turned over 45,000 km (27,000 miles). Everything else is normal, gearbox smooth as silk; bike is meticulously serviced.

When manoeuvring slowly it is a pain - much like a slack chain. Normal? Within tolerance?

viz

I get the same free movement on my 2013 GSA. If you're hearing a clunk, check those U-Joints.
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Old 01-02-2013, 09:55 AM   #3
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I get the same free movement on my 2013 GSA. If you're hearing a clunk, check those U-Joints.

My 13 GSA has a lot of driveline "slop" if you will, something I am not used to. Most noticed in first gear. First BMW so what do I know except I dont like the sloppy feel in on and off throttle in first gear. Only 743 miles on it and sloppy from first ride. D.
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Old 01-02-2013, 11:36 AM   #4
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Drive line lash is the sum of the clearances of several mechanical parts:

1- Clutch/input shaft spline.
2- Gearbox
3- Transmission output shaft/front u-joint.
4- Rear u-joint/final drive input shaft spline.
5- Final drive.

When these clearances are converted to rotational lash, it adds up to several rotational inches of what many call slop.

Next time you have the rear wheels of your rear wheel drive car off the ground, check the "slop" in the drive line with the car in gear.

As for low speeds, that's what the dry clutch is for...slip it when you're at low speeds in lower gears.

If you try to modulate the throttle of a large twin-cylinder powered motorcycle at low speeds without feathering the clutch, you'll experience plenty of drive line snatch regardless of chain or shaft drive.

That's why the Shriners rode Cushmans in parades.
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Old 01-03-2013, 02:35 AM   #5
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I marked my tire and it's about two inches of movement at the rim
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Old 01-03-2013, 02:52 AM   #6
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My 2010 is the same. Relax, as Def sez, it`s normal.
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Old 01-03-2013, 09:19 AM   #7
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My 2010 is the same. Relax, as Def sez, it`s normal.
I thought you were gonna say, "Trade it in on a Cushman".

Happy New Year.
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Old 01-04-2013, 03:41 AM   #8
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I thought you were gonna say, "Trade it in on a Cushman".

Happy New Year.

Back at ya!!
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Old 01-03-2013, 08:13 AM   #9
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My 2013 GSA is also the same. Had a Super Tenere also with significantly more lash still, so I'm not concerned about the GSA.

Dan
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Old 01-03-2013, 09:13 AM   #10
def
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My 2013 GSA is also the same. Had a Super Tenere also with significantly more lash still, so I'm not concerned about the GSA.

Dan
See? Dan knows lash.
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Old 05-24-2013, 02:47 PM   #11
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Originally Posted by viz View Post
I have noticed recently that the driveline backlash on my 2010 GSA seems to be increasing - stick it in 1st gear on the main stand and rocking the rear wheel back and forth produces about 2"+ of movement with quite a hefty clunking noise which seems to be coming from within the gearbox rather than the actual driveshaft or surrounds. This clunking noise is also heard throttling back and forth, especially in the low gears. Bike has just turned over 45,000 km (27,000 miles). Everything else is normal, gearbox smooth as silk; bike is meticulously serviced.

When manoeuvring slowly it is a pain - much like a slack chain. Normal? Within tolerance?

viz
My 2013 GSA is exactly like this also. I noticed it after my 1000k service and was a bit paranoid I guess. Perhaps it was more evident just because i was manoevering out of the crowded dealer lot?!?

I know the final drive oil was done correctly because I did it myself, and so it is nice to see this amount of lash is normal, (2"at rear tread).
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Old 05-24-2013, 07:10 PM   #12
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2013 GSA and it has SLOP SLOP SLOP, and I don't like it but THEY ALL DO THAT. So I here. Its 2013 and it makes clangs and bangs and rattles and squeaks. D.
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Old 05-24-2013, 07:53 PM   #13
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2013 GSA and it has SLOP SLOP SLOP, and I don't like it but THEY ALL DO THAT. So I here. Its 2013 and it makes clangs and bangs and rattles and squeaks. D.
The boxer engine and driveline layout does not react well to unloading and loading the throttle, especially at low speeds and in low gears. Since the boxers are no longer race bikes, using engine braking by shifting to a lower gear produces driveline snatch and discomfort along with strange noises.

Learn to keep the driveline loaded (under load) until you must slow then, merely let off the throttle and shift down into lower gears as the speed of the bike demands lower ratios to eliminate engine lugging. For example, as I approach a stop, I pull in the clutch and downshift in conjunction with the reduced bike speed until I reach neutral or first…left foot down and rear brake clamped at stop.

My gearbox never clunks or clanks with noise due to engine RPM and wheel speed differences. You’ll have to practice a bit but throttle blipping with downshifting or down shifting and releasing the clutch to use engine braking is just plain unnecessary in my estimation and places undue strain on the driveline.

Remember, you have a rubber driveshaft damper that help reduce driveline clatter but it can do only so much. Smooth application of throttle and managing engine back lash with the clutch will produce very smooth shifting and driveline operation.
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Old 05-24-2013, 08:21 PM   #14
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[QUOTE=def;21487593]Remember, you have a rubber driveshaft damper that help reduce driveline clatter but it can do only so much[QUOTE]

Huh? Where's this rubber damper located? I thought they were solid drive stem to stern.
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Old 05-24-2013, 08:49 PM   #15
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Here's a 'new' attempt at an Airhead driveshaft



See right there where the large OD part of the shaft mates with the small OD part of the shaft? There's rubber in there. It's the black ring you can see there. It can go bad, and in this very forum we've had people whose bikes have slipped under load and at speed when the rubber is hot and given up, and then when the thing cools down it runs fine. It's caused quite a bit of confusion.
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