Wurring sound… from trans or final drive?

[phydeauxmutt]

Hope you locate the problem, but if you are only going 35 mph at 2700-3000 rpm in 5th gear, you DEFINITELY have a problem of some sort.

Because the bike is an '82, the splines in the rear wheel are also suspect, but they don't usually "wurr" (whir), they just let go and you DON'T go.

[Buffalo Bill]

Looks like the Driven Shaft nut can be seen if the rubber sleeve is pulled back.

I have a pdf copy of the Suzuki Service Manual.

[Nessism]

Looks like the Driven Shaft nut can be seen if the rubber sleeve is pulled back.

I have a pdf copy of the Suzuki Service Manual.

Here is a PDF of a driven gear repair made on a 650. Question for the forum: does the 1100 fail in the same way as shown here? If it does, looking at the nut may not tell the story. I'm not sure how to test.

http://members.dslextreme.com/users/storagecliff/images/bevel_gear_shaft_repair_zooks.pdf

[Buffalo Bill]

On the jack:
Pulling the rubber sleeve back I see no bad. Minimal slack in final drive.
Rocking the rear wheel back and forth in 1st gear, all the slack is to my left, Secondary Bevel Gear and trans area.
Secondary gear oil is at normal level, 3700 miles since gear oil changed to Valvoline synthetic 75-140 (limited slip).

A couple 78 skunks have shown up for sale… considering buying one and transferring all my bolt on improvements.

[GregT]

On the jack:
Pulling the rubber sleeve back I see no bad. Minimal slack in final drive.
Rocking the rear wheel back and forth in 1st gear, all the slack is to my left, Secondary Bevel Gear and trans area.
Secondary gear oil is at normal level, 3700 miles since gear oil changed to Valvoline synthetic 75-140 (limited slip).

A couple 78 skunks have shown up for sale… considering buying one and transferring all my bolt on improvements.

I'd guess a collapsed bearing or spacer in the right angle gearset.

[Buffalo Bill]

Looks like my only parts source is ebay salvage.
Ok, changed the gear oil and did another test ride.
The wurr comes on between 2000 to 3000 rpm in 4th and 5th gear only.
Decided to just ride it and monitor any change.

[Redman]

The problem I had (which doesn’t seem to be the symptoms you are describing) was that treaded end of the driven gear breaking off. Can be detected by reaching inside the boot, and can slide the two flanges (one on secondary, one on shaft, bolted together) back and forth about 3/8 - 1/2 an inch. It should only spin around with the shaft when shaft turns, but not slide back and forth at all.

was not going to confuse things with the posting of failure I had, since doesn’t seem to be what you are describing. But will see if I can find that posting and send you a link.

[Redman]

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[Redman]

Looks like the Driven Shaft nut can be seen if the rubber sleeve is pulled back.

. . . . .

Not really, it is kinda inside the flange on the secondary and the flange on the shaft that are bolted together. You dont see it untill you unbolt those two flanges from each other, and pull off the swing arm.
Is More that I can say. . . . but lets better identify the specifics of your situation.

Eeessschh, I am not that much of a gearhead to be giving such advise. I only know a few things from having had a problem with these secondary gears.

[Redman]

Here is a PDF of a driven gear repair made on a 650. Question for the forum: does the 1100 fail in the same way as shown here? If it does, looking at the nut may not tell the story. I'm not sure how to test.

http://members.dslextreme.com/users/...pair_zooks.pdf

Yes.

ANd test by seeing if the flanges slide back and forth any (if threaded end broke the flanges will slide back and forth about 3/8th inch or a little more) and when it does that when running then the u-joint is not inline with the pivot point of the swingarm and then stuff is not just spinning it is kinda orbiting around.... or something like that.

Yes, That threaded shaft on the back of the driven gear can break off. And when unbolt the two flanges and pull back the swing arm, that nut can fall out on the floor, with the broken off threaded shaft in it. That was quite a sight when I saw that, and I really did not understand what I was seeing. But then I slowly came to understand it.
(And , oh, bye the way: I feel strange, me trying to explain something like this. I am not gear head.)



And that repair/modification described in the PDF is called "Zooks repair" (after the author of that pdf.)



BUt, we have yet to determine is this is BUffalo Bills problem. SO far has only stated a whiring sound.

[Redman]

On the jack:
Pulling the rubber sleeve back I see no bad. Minimal slack in final drive...
....
.....

That is what I said in 2017. Then Brian said "But can you push the flanges forward and back?" . . . .

I dont mean wheel and shaft spinning in forward and back as the rear wheel turns forward and back.... I mean slide the flanges (and ujoint) forward (toward front) on the spines and back (toward back of bike) on the spines. It should not. If it does, well, that is the broken off threaded end of the driven gear.

On mine, I had to get the rubber boot back further so I could get a couple fingers of one hand on one side and couple fingers of other hand other on other side, then push toward front bike and then toward back of bike. Then I could push the flanges (and ujoint) forward and back about 3/8th of inch. Brian said "that bad. Threaded shaft broken off the driven gear." I didn't really understand, but knew meant I was disassembling things further, so I did. . . . . then I understood better.

[Buffalo Bill]

But can you push the flanges forward and back. . . .

I dont mean wheel and shaft spinning in forward and back as the rear wheel turns forward and back.... I mean slide the flanges (and ujoint) forward (toward front) on the spines and back (toward back of bike) on the spines. It should not. If it does, well, that is the broken off threaded end of the driven gear.

I'll try that, but when I put my finger in there and spun the back wheel, it looked and sounded tight, no burn odor, no slack, no problemo.

[Buffalo Bill]

I am starting to feel something like this, I been wondering if the road pavement is developing washboard bumps like gravel roads do. Our local roads are way overdue for repaving, the State of Michigan ain't got no money.
From Redman:
"Now in recent weeks I have been noticing something of a small shutter sometime when let off the throttle. Happens more at higher rpm. Just a short little shutter, somewhat like ran over a mini-rumble strip, but not comming from the tires."
thread link: https://www.thegsresources.com/_foru...ight=secondary

[GregT]

Looks like my only parts source is ebay salvage.
Ok, changed the gear oil and did another test ride.
The wurr comes on between 2000 to 3000 rpm in 4th and 5th gear only.
Decided to just ride it and monitor any change.

The points of highest torque loading. Bearing going bad is my pick now.

[Buffalo Bill]

The points of highest torque loading. Bearing going bad is my pick now.

Thanks Greg, any idea the likely bearing? There's 2 bearings on the driven gear pinion shaft.