BMW K bikes (Bricks)


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

MarcS

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   Back wheel wobble Empty Re: Back wheel wobble Wed Oct 10, 2018 3:54 am

Two Wheels Better

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.


__________________________________________________
"How many cars did we pass today?" "ALL of them."
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

3Back to top Go down   Back wheel wobble Empty Re: Back wheel wobble 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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Red 1991 K75S
    

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

charlie99

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


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

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

MarcS

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?


__________________________________________________
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   Back wheel wobble Empty Re: Back wheel wobble Wed Oct 10, 2018 5:30 am

charlie99

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't  done 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


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

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

Two Wheels Better

Two Wheels Better
Moderator
Moderator
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.


__________________________________________________
"How many cars did we pass today?" "ALL of them."
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

8Back to top Go down   Back wheel wobble Empty Re: Back wheel wobble 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 after a 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.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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

Snod Blatter

Snod Blatter
Life time member
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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..


__________________________________________________
1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL, '01 R1100GS
http://justbikethings.blogspot.co.uk/
    

10Back to top Go down   Back wheel wobble Empty Re: Back wheel wobble 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 Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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

MarcS

MarcS
Silver member
Silver member
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.


__________________________________________________
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   Back wheel wobble Empty Re: Back wheel wobble Wed Oct 31, 2018 12:17 am

MarcS

MarcS
Silver member
Silver member
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


__________________________________________________
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   Back wheel wobble Empty Re: Back wheel wobble Wed Oct 31, 2018 5:13 am

charlie99

charlie99
VIP
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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


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

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

MarcS

MarcS
Silver member
Silver member
Thanks Charlie


__________________________________________________
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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