BMW K bikes (Bricks)

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1Back to top Go down    Back wheel wobble on Wed Oct 10, 2018 3:49 am

MarcS

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I just finished searching the forum looking for reasons for my handle bars oscillating (mainly on right hand sweepers above 100kmh), and came across a thread by MikeP on replacing the crown wheel bearing and seal. My back wheel has a couple of mm of play with my hands held at 6-12 and 3-9. Since I have already replaced the steering head bearings, front wheel bearings, swing arm bearings, tyres, wheel balance, springs and rear shock, surely this MUST be the thing that is causing the wobble??????? The other question i have is what else could cause the back wheel (definitely not the swing arm, just the wheel) to wobble?


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K100rt ex plod bike 5/1990.



I have no problem with authority. Just some of the morons that are paid to enforce it.
    

2Back to top Go down    Re: Back wheel wobble on Wed Oct 10, 2018 3:54 am

Two Wheels Better

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Paralever final drive? Prolly the two pivot bearings. This is common on those FDs. Of course, if it's a standard Monolever, it could also be the large bearing inside the FD. With that much play it's gunna get scary really fast. Listen for a grinding or low hum as you rotate the wheel. Drain the gear oil and look for bits.


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1987 K100RS, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
Sniff...can you smell that? I think it might be bullsh*t.

    

3Back to top Go down    Re: Back wheel wobble on Wed Oct 10, 2018 4:29 am

TacKler

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If the four wheel bolts are tightened up and the spacer is missing will they bottom out, leaving some play?


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4Back to top Go down    Re: Back wheel wobble on Wed Oct 10, 2018 4:50 am

charlie99

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@TacKler wrote:If the four wheel bolts are tightened up and the spacer is missing will they bottom out, leaving some play?

good point dave


good luck marc


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

5Back to top Go down    Re: Back wheel wobble on Wed Oct 10, 2018 5:12 am

MarcS

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There is no grinding/droning sounds (just what you would expect from the meshing/unmeshing of the FD) but I will drop the oil on the morro and further investigate. Its a monolever TWB.

I remember installing the spacer before the wheel so its not that. I am starting to feel a little more positive now. I have owned a couple of shaft drives but never had the need to delve into them. Will a local bearing shop have the parts and O ring or is it a mail order job for the geographicaly challenged like myself?


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K100rt ex plod bike 5/1990.



I have no problem with authority. Just some of the morons that are paid to enforce it.
    

6Back to top Go down    Re: Back wheel wobble on Wed Oct 10, 2018 5:30 am

charlie99

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they may have the oring , the big bearing unlikely ...but orderable ...perhaps

the oring from the local suppliers produces this oring 171.12 x 2.6 part= bs166n70 from cbc suppliers $6.67 +gst

I found a suitable bevel bearing from somewhere under $25 from memory

but the big bearing ?? haven'tdone that search yet you may find the dimensions on the real oem suppliers parts lists - 85X120X18

motobins at 38 pounds ...motorworks at 40 pounds




good luck marc


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

7Back to top Go down    Re: Back wheel wobble on Wed Oct 10, 2018 5:46 am

Two Wheels Better

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Yeah, the thickness of the shim has little/no bearing on the lug bolt's ability to be tightened fully. My Big Block has no shim 'tween wheel and FD surface.

I've never seen an aftermarket bearing supplier making that bearing available. Fraid it's dealer only.

Unless you need to be riding soon I'd say 'Bins or 'Works are your best bets.


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1987 K100RS, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
Sniff...can you smell that? I think it might be bullsh*t.

    

8Back to top Go down    Re: Back wheel wobble on Wed Oct 10, 2018 6:55 am

92KK 84WW Olaf

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My K100RT needed the final drive to be sorted too. I had a suspicion and got it checked out, the big bearing was the problem and this was before it was showing any play at all. The trick is to get to it the minute you have doubts, if you leave it the rest can become toast fairly quickly. The big bearing is the same one across a lot of the BMW final drives. A habit I have is I always check temperature of final drive and wheel bearings aftera trip. If you ever tow a trailer its a habit you get, checking trailer wheel bearings and its no different. Wear means more friction means more heat and possible play.


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1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 84,600 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

9Back to top Go down    Re: Back wheel wobble on Thu Oct 11, 2018 5:47 pm

Snod Blatter

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The OEM crown wheel bearing comes from SKF and was quite a lot cheaper when bought from BMW, I found. Mine is currently running a NTN 6197C3 which is a 17 ball bearing (later OE ones are 19 ball) but whatever.

If it is actually the crown wheel bearing (i.e. the big single wheel bearing for the rear) it'd be pretty scary at 2mm play, I bet mine was at about 0.5mm the bike leapt about after hitting road imperfections - I nursed it home knowing full well something had gone wrong somewhere. What's the mileage of the bike, these bearings seem to give in around the 70-80K mile mark..


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1989 K100RS SE ABS 8v VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
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10Back to top Go down    Re: Back wheel wobble on Thu Oct 11, 2018 6:13 pm

92KK 84WW Olaf

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@Snod Blatter wrote:The OEM crown wheel bearing comes from SKF and was quite a lot cheaper when bought from BMW, I found. Mine is currently running a NTN 6197C3 which is a 17 ball bearing (later OE ones are 19 ball) but whatever.

If it is actually the crown wheel bearing (i.e. the big single wheel bearing for the rear) it'd be pretty scary at 2mm play, I bet mine was at about 0.5mm the bike leapt about after hitting road imperfections - I nursed it home knowing full well something had gone wrong somewhere. What's the mileage of the bike, these bearings seem to give in around the 70-80K mile mark..

That's exactly where mine went!


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 84,600 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

11Back to top Go down    Re: Back wheel wobble on Thu Oct 11, 2018 8:28 pm

MarcS

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my odometer stopped working at 193000km or so. I have no idea how long ago that was, it's also the second speedo so mileage is pretty well open for guesses.


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K100rt ex plod bike 5/1990.



I have no problem with authority. Just some of the morons that are paid to enforce it.
    

12Back to top Go down    Re: Back wheel wobble on Wed Oct 31, 2018 12:17 am

MarcS

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Which seal do I need to order from 'Bins? There are two and I am betting its the larger (more expensive) seal. The small one (input) is Code: 43115 the larger (output) is Code: 43220


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K100rt ex plod bike 5/1990.



I have no problem with authority. Just some of the morons that are paid to enforce it.
    

13Back to top Go down    Re: Back wheel wobble on Wed Oct 31, 2018 5:13 am

charlie99

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yeah the input seal is quite small by comparison (but often overlooked , leaking oil into the driveshaft splines and washing off the lubricant )

the big one is the go

don't forget to run around the hub of the output shaft with some wet and dry , to take the small lip in the metalworks .before installing the shaft through the seal .and lots of trani oil to grease it up as it goes over the shaft

good luck mate


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

14Back to top Go down    Re: Back wheel wobble on Wed Oct 31, 2018 8:51 pm

MarcS

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Thanks Charlie


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K100rt ex plod bike 5/1990.



I have no problem with authority. Just some of the morons that are paid to enforce it.
    

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