Post by: Tanton37 on February 10, 2025, 01:07:20 PM
Thanks David
Post by: Past-my-Prime on February 11, 2025, 10:40:45 AM
Do you know what model you are looking for? Is it to ride, or for a project to customize?
Post by: Tanton37 on February 11, 2025, 10:53:47 AM
Thanks David
Post by: Past-my-Prime on February 11, 2025, 10:59:09 AM
I found it sporty enough in the turns but was moving from a Honda 450 so probably was happy with the upgrade!
Post by: Laitch on February 11, 2025, 01:24:17 PM
Well I’m sure someone more knowledgeable will answer, but I have not heard of K75 RS. There’s the RT, or the S, or possibly just K75.That's the lineup, all right.
K75
(https://www.motobrick.com/gallery/4/1601-110225131826.png)
K75RT
(https://www.motobrick.com/gallery/4/1601-110225131945.png)
K75S
(https://www.motobrick.com/gallery/4/1601-110225143025.png)
Post by: frankenduck on February 11, 2025, 01:38:19 PM
(Red ones are fastest.)
Post by: Tanton37 on February 11, 2025, 03:37:41 PM
Post by: natalena on February 11, 2025, 04:14:13 PM
Post by: Tanton37 on February 11, 2025, 04:54:44 PM
Post by: Laitch on February 11, 2025, 06:07:08 PM
Currently scoping out an 86 S in beautiful condition but 130,000 km. which the seller tells me is nothing to worry about.At least the seller didn't say, Pay no attention to that man behind the curtain.
If you get to see the driveshaft and rear drive splines, that will be a rare accommodation indeed. Make several photos of the shaft splines—some straight-on and some looking slightly downward on them—with good lighting and resolution—then post them here. If you can see clearly into the tank, inspect it for amber discoloration of its floor and walls indicating fuel separation from old fuel in the left tank during the course of its use. The weep hole under transmission and the one under the oil/coolant pump should be checked for leakage.
A Brick with that many klicks on it has been run sufficiently to keep it in reasonably good condition. 112350
Post by: frankenduck on February 11, 2025, 09:03:37 PM
Post by: natalena on February 12, 2025, 02:05:11 AM
Currently scoping out an 86 S in beautiful condition but 130,000 km.That's about the same as the 80,000+ miles on my 87, which runs fantastic with general maintenance and corn-free gas. Sourcing parts from EME, Motobins or Beemer Boneyard is relatively easy. * I have found parts at Bob's and Mortons BMW too.
Post by: The Mighty Gryphon on February 12, 2025, 12:45:01 PM
Yes, check inside the tank, that is a very common problem point. A clean tank is a great sign. Check the weep hole at the bottom of the clutch housing for any sign of oil. Check the shifter for free play, normal play at the end of the shifter when it's in neutral is about 2cm, significantly more than that may indicate a loose grub screw in the transmission that can be an all day job to correct.
With the bike on the center stand, grab the wheels at 9 and 3 o'clock and give them a shake. There should be no play if the wheel bearings are good. Check the shaft of the rear shock for any oil that would indicate a worn shock. With the front wheel off the ground, gently push the handle bars from side to side feeling for any notchiness.
The bike has enough mileage that the rear splines could be worn through poor maintenance. The condition of the bike as a whole might tell how it was cared for, or maybe not. If you are not sure, you might offer the seller a non-refundable cash deposit to be applied to the price of the bike to inspect the drive shaft splines. The understanding is that if they are in good condition you will purchase the bike. If not, the seller can keep the cash as payment for opening up the swing arm to inspect the drive shaft.
This is probably the most important part of the bike's inspection since worn splines can be the most costly repair to be made on a used bike. Below are a couple photos of what good splines look like on a bike with 90,000 miles. Note how wide and flat the tops of the splines are. As they wear, the tops will get narrower until the entire spline is gone.
DSCN3341.JPG (22.8 kB . 609x576 - viewed 436 times) DSCN3347.JPG (40.19 kB . 607x576 - viewed 436 times) DSCN3349.JPG (38.13 kB . 618x576 - viewed 449 times)Normally, it is only the splines at the final drive end of the drive shaft that wear. At the connection to the transmission, the splines are stationary, and as a result, there is very little wear, if any.
Post by: Tanton37 on February 12, 2025, 01:16:22 PM
Post by: frankenduck on February 12, 2025, 01:56:03 PM
(https://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/splientology/K75.K100.2V.Spline.Worn.Wear.jpg)
Link to more info about splines: Splientology (https://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/splientology/Splientology.pdf)
Post by: Altosax on August 27, 2025, 05:42:54 PM