Post by: Arthur_229 on January 13, 2019, 01:39:41 PM
as said in my introduction that i would start a topic on my k75.
got this 88 k75s off a friend for a bottle of wine. the engine fires up and runs but cant put any gears luckely stuck in neutral. worst case cenario some ebay shopping for a gearbox.
here is a foto with no work started
(http://i760.photobucket.com/albums/xx245/arthur229/bmw/IMG_20190108_204442_309_zpsdtzcowei.jpg) (http://s760.photobucket.com/user/arthur229/media/bmw/IMG_20190108_204442_309_zpsdtzcowei.jpg.html)
I have been striping her down
(http://i760.photobucket.com/albums/xx245/arthur229/bmw/DSC_0343_zpsftl4bazc.jpg) (http://s760.photobucket.com/user/arthur229/media/bmw/DSC_0343_zpsftl4bazc.jpg.html)
(http://i760.photobucket.com/albums/xx245/arthur229/bmw/DSC_0341_zps4mpzvizq.jpg) (http://s760.photobucket.com/user/arthur229/media/bmw/DSC_0341_zps4mpzvizq.jpg.html)
a little problem with the exhaust
(https://i760.photobucket.com/albums/xx245/arthur229/bmw/IMG-20190113-WA0006_zpszxga98hw.jpeg) (https://s760.photobucket.com/user/arthur229/media/bmw/IMG-20190113-WA0006_zpszxga98hw.jpeg.html)
a bit rusty
Its going to be a long journey before its back on the road.
Post by: Laitch on January 13, 2019, 02:20:18 PM
got this 88 k75s off a friend for a bottle of wine. the engine fires up and runs but cant put any gears luckely stuck in neutral. worst caseDo you know if shifting failed while the original owner was riding it? Maybe the clutch isn't disengaging. Check that. Maybe you should warm up the transmission case, open the filler and drain ports, empty whatever is left in the case then refill it with 0.8L of warmed 80w90 trans fluid. Maybe you could gently work at rotating the rear wheel after you do all that, then try shifting. There are a few options left before getting into somewhere you don't need to go, yet.
You probably ought to check the valve clearances, assess the engine's compression and see if you can get the drive train working before you do further stripping of this relic.
Post by: Arthur_229 on January 13, 2019, 02:29:46 PM
Do you know if shifting failed while the original owner was riding it? Maybe the clutch isn't disengaging. Check that. Maybe you should warm up the transmission case, open the filler and drain ports, empty whatever is left in the case then refill it with 0.8L of warmed 80w90 trans fluid. Maybe you could gently work at rotating the rear wheel after you do all that, then try shifting. There are a few options left before getting into somewhere you don't need to go, yet.
You probably ought to check the valve clearances, assess the engine's compression and see if you can get the drive train working before you do further stripping of this relic.
What I know is that the previous owner let the gearbox loose all the oil and that the clutch died.
He drove the bike from work to home without oil about 10 miles.
Post by: Laitch on January 13, 2019, 02:50:08 PM
What I know is that the previous owner let the gearbox loose all the oil and that the clutch died.:laughing-on-ground:
He drove the bike from work to home without oil about 10 miles.
Post by: alexg on January 13, 2019, 02:59:58 PM
Post by: Arthur_229 on January 13, 2019, 03:23:53 PM
greetings...
somebody may have removed the driveshaft to sell on ebay... that and fliuds may be all you need...
j o
Probably that did it, but before buying a new gear box, try to put it in gear w/o the engine running. If the thing shifts, there is a chance that the box is ok, and the clutch is stuck due to high humidity; humidity plus clutch pressure might have bonded the friction disk to flywheel with rust. Happens to me every winter, and Michigan in winter is much dryer than the UK.
Just opened the filler of the gear box and there was alot of creamy gunk
Post by: Laitch on January 13, 2019, 03:37:18 PM
Just opened the filler of the gear box and there was alot of creamy gunkDon't eat it, no matter how appealing it is. Clean it out and follow previous instructions.
Post by: Arthur_229 on January 13, 2019, 04:16:44 PM
greetings...Will do, I'll tell you all if it needs a bit of sugar or salt
spread that on crumpets and report back here...
im thinking the twerk converter needs charged...
j o
Next time I get free time ill continue the job
Post by: The Mighty Gryphon on January 14, 2019, 09:46:10 AM
Is the shift lever moving, or is it stuck? If it moves but doesn't change gears it's possible that the grub screw has loosened to where the shifter no longer moves the shift drum. If that is the problem you should be able to fix it in a long day of work.
I had a very loose grub screw on my first brick, and besides taking about 7 hours to fix it, it wasn't a bad job. That included lubing the drive shaft, final drive and clutch splines along with the swing arm bearings and putting proper torque on all the fasteners back there.
It would also be a good time to change the clutch o-ring and possibly the rear main seal on the engine.
Post by: Arthur_229 on January 18, 2019, 05:36:16 AM
Post by: The Mighty Gryphon on January 18, 2019, 08:36:03 AM
Post by: Arthur_229 on January 18, 2019, 08:53:01 AM
Is the lever stuck or does it move? How far does it move? Proper travel is about 2" or less.It doesn't move
Post by: The Mighty Gryphon on January 18, 2019, 09:16:01 AM
That may be good news, as that damn screw is a pain in the ass to get installed.
Post by: Arthur_229 on March 14, 2019, 07:37:53 AM
Post by: Arthur_229 on April 13, 2019, 07:50:17 AM
20190413_085554.jpg (140.88 kB . 768x432 - viewed 707 times)
Post by: natalena on April 13, 2019, 09:45:14 AM
Post by: Arthur_229 on April 13, 2019, 09:48:59 AM
Looks nice. Did you figure out the transmission issues? With luck, you'll have 2 or 3 sunny days of UK Spring to work on the bike. ;)Didn't bother opening it and just got another gearbox from a k1100
Post by: Arthur_229 on April 23, 2019, 04:09:10 PM
Post by: szabgab on May 09, 2019, 05:47:28 PM
Post by: Arthur_229 on May 18, 2019, 09:07:51 AM
And almost forgot the rearsets.