Author Topic: K75 Tranny Beyond Hope?  (Read 8209 times)

Offline TaosBrick

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K75 Tranny Beyond Hope?
« on: April 11, 2012, 01:33:53 PM »
This is what I found 1,100mi after changing th' gear oil:







Is it even worth putting the Guard Dog in, or should I start shoppin' for a used or rebuilt trans?
Flog It Every Day - I mean, the BIKE!
'92 K75, '73 R75/5 Café,'89 Yam XT350
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Offline frankenduck

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Re: K75 Tranny Beyond Hope?
« Reply #1 on: April 11, 2012, 02:25:49 PM »
That does look like a lot of fuzz for only 1100 miles.  How is it shifting?
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
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Offline TaosBrick

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Re: K75 Tranny Beyond Hope?
« Reply #2 on: April 11, 2012, 02:35:12 PM »
Rather clunkily, I must say. False neutrals occur regularly if one does not shift with some authority. Checked clutch hand lever free play, seemed to be about 1/2" or so. Lower clutch lever free cable length just shy of 3", like it sez in the manual. Any adjustment of handle free play results in lower lever free cable length being less than spec. But there does appear to be about 1/4" to 3/8" of play in that distance before any resistance is felt, so the free cable length would be about 2 - 5/8" before resistance is felt. Clutch does not have but maybe 11,000mi on it at most. 
Flog It Every Day - I mean, the BIKE!
'92 K75, '73 R75/5 Café,'89 Yam XT350
Expect Nothing, Be Ready For Anything.
- Samurai Maxim

Offline frankenduck

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Re: K75 Tranny Beyond Hope?
« Reply #3 on: April 11, 2012, 02:40:19 PM »
How are you adjusting the clutch?  First the cable length at the arm via the bolt on the other end of the arm and then the free play.  Adjusting the free play should have no effect on the exposed cable length at the other end.
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
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Offline TaosBrick

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Re: K75 Tranny Beyond Hope?
« Reply #4 on: April 11, 2012, 02:44:12 PM »
Cable length at arm was spec. upon inspection. However, "free play", ie movement before resistance was felt, was as reported.
Flog It Every Day - I mean, the BIKE!
'92 K75, '73 R75/5 Café,'89 Yam XT350
Expect Nothing, Be Ready For Anything.
- Samurai Maxim

Offline TaosBrick

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Re: K75 Tranny Beyond Hope?
« Reply #5 on: April 11, 2012, 02:50:12 PM »
Hmm... I think I see where I may be effing up here. Should the end of free play in the arm be at the 2.95" of free cable length specified?
Flog It Every Day - I mean, the BIKE!
'92 K75, '73 R75/5 Café,'89 Yam XT350
Expect Nothing, Be Ready For Anything.
- Samurai Maxim

Offline TaosBrick

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Re: K75 Tranny Beyond Hope?
« Reply #6 on: April 11, 2012, 02:57:10 PM »
OK - ignore that last comment. It makes no sense in terms of what the owners manual says. spec length of free cable is what it is :bang-head:

Well, guess I'm gonna put the Guard Dog in and ride it to ABQ and back, or until it won't move, as jo sez, whichever comes first. GOTTA get my tax stuf to my acct. down there yesterday! :yow.

  I see on yer K-Bike partz site that you have a K75 trans for three-fitty, if that is what may be required, and you still have it.
Flog It Every Day - I mean, the BIKE!
'92 K75, '73 R75/5 Café,'89 Yam XT350
Expect Nothing, Be Ready For Anything.
- Samurai Maxim

Offline wmax351

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Re: K75 Tranny Beyond Hope?
« Reply #7 on: April 11, 2012, 03:41:39 PM »
I've found that the factory spec for the clutch isn't always best. I adjust it until the engagement position is most comfortable for me, and usually have the rear lever screw pretty far out.
  • Albuquerque, NM
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Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Rick G

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Re: K75 Tranny Beyond Hope?
« Reply #8 on: April 11, 2012, 07:43:50 PM »
Have you done a spline lube on the input shaft. If that is dry you will get a clunky trans and that could well cause the fragments in the magnet.

Offline TaosBrick

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Re: K75 Tranny Beyond Hope?
« Reply #9 on: April 12, 2012, 10:10:58 PM »
OK - so I rode to from Taos to Albuquerque and back, round trip total of something under 400mi (made it longer by taking the super-duper awesome "High Road" on the way back. (see soon-to-be-posted TR by that name).
  Anyhey, had to stay in Santa Fe overnite due to weather at my mesa home, rendering the "driveway" impassable until afternoon today. While dithering at my buddie's place in SF, I adjusted the clutch to what felt right to me ie, tightened arm adjust bolt to where there was just a smidge of play, and the hand lever same same. Shifting is noticeably less clanky, or so it would seem at the outset. Perhaps the Gaurd Dog is beginning to kick in as well.
  To answer your question Rick G, the machine just ticked over 33,000 today, and the splines were lubed at 28,161. But- that spline lube happened back in '01. Poor ol' Chile Red suffered about ten years of serious neglect in the back of PO's garage gathering dust. Makes me sad think of how lonesome she must've felt. So I'm wondering - even though the milage since spline lube was low, that it might possible for the grease to have dried out somewhat in 11 years, thus necessitating that I consult the L Duck Hubbard Splientology manual a bit sooner than I had anticipated.

  I think too, that a large part of this situation was caused by an incomplete understanding of Brickitude on my novice part. When I first got the bike, I presumed that as I heard no lessening of revs when pulling the clutch handle and shifting into first while motionless, or even when shifting into second while sitting motionless, everything was jake as far as clutch adjustment went. Second, I'd read in more than one place that Bricks shift well, clunk-ily. So I rode on in semi-blissfull ignorance, only recently beginning to wonder why the clanky-ness was on the increase. Sometimes I wonder if I have just enuf mechanical understanding to be dangerous to the machines I love  :bang-head:

  Hopefully, now that I've got things somewhat more figured out, I'll get some more miles outta this tranny before having to find another one or - gasp - trying to rebuild it myself.
Flog It Every Day - I mean, the BIKE!
'92 K75, '73 R75/5 Café,'89 Yam XT350
Expect Nothing, Be Ready For Anything.
- Samurai Maxim

Offline frankenduck

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Re: K75 Tranny Beyond Hope?
« Reply #10 on: April 12, 2012, 10:56:58 PM »
You need more words with dashes in them. :laugh
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
New to K bikes? Click here.
K Bike Maintenance & Mods: Click here.
Buy parts here.

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