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Do your handlebars start shaking in resonance, that is the amplitude increases unless corrected, when both hands are off the handlebars while riding?
Straight and level highway at cruising speed of 60mph; all bags on, ie. top case + side cases with very little load in any.Under what conditions? Going straight or in a corner? How fast? Loaded how? Etc. In answer to your question - no. That shouldn't happen. The Klassic K-bikes can have a undulation (wobble) in corners like any other bike if there are problems with loose fork head or swing arm bearings, a worn rear shock, or so on.
Don't forget a tired or poorly adjusted rear shock.
A lo of time things like this can be caused by more than one thing which together make the problem really noticeable. From what I have seen adjusting/replacing steering head bearings, making sure tires are properly balanced, and spending some time checking out the front and rear suspension (especially fork alignment, fork oil & rear shock) usually does the trick.
Give this 3-part series a look:
http://youxube.com/watch?v=tVWHfyG4jB4
When he got the steering assembly apart, he let me
know that one of the parts in the steering dampner was worn out and that he
could not find replacement parts for it.
That guys videos DRIVE ME NUTS!!!!
Ahhh, famous last words of wisdom. Did I see this part in Clymer's in bold print? Or was it the Hayne's manual? So, what happens that is so terrible if overtightened?...and don't tighten the oil filter more than a half turn beyond hand tight
So, what happens that is so terrible if overtightened?
Your K75 goes >90mph?! You must have been in the red line zone or very close to it for sure. You guys don't have speed law enforcement down there? Up here, speeding is worse than robbing a bank.Not to highjack this thread, but to add something to check to the list.
Saturday I took my 1990 K75 on a very spirited ride on a nice piece of local twisty road. In some high speed sweepers (>90mph) I was getting a nasty wobble that seemed to be self-reinforcing once it got started. Very disconcerting.
Yesterday I checked the rear swing arm and front fork free play and didn't find any obvious problems. So I checked the fame alignment by removing one frame bolt at a time to see if there was a gap between the fame and engine or transmission. By looseing all the frame bolts and shaking the bike I found that the right rear (bottom), right center (bell housing), and left front engine frame mounts all exhibited a gap once the bolts were released. The left rear and front right mounts were aligned. A quick trip to Ace Hardware and I had some .77 mm thick washers which were the right thickness, diameter, and hole size to shim these gaps.
A spirited test ride today revealed that about 75% of my problem was gone. During 90 MPH+ hard corners I could get a very small amount of "hinge-in-the-middle" effect, but it did not continue to increase once started like yesterday, and was directly proportional to throttle input and speed. If I backed off - it did, which was not the case yesterday. Big improvement!
The rear tire is basically worn out, so next I'm going to test with a new tire, and then remove the bags and rear tail trunk to see if they are catching air off the Pichler fairing at those speeds.
My theory is that that relatively small amount of preload on the frame was enabling it to act like a spring and begin to resonate once I got any instability, much like a classic fork head speed wobble. I also noticed the the overall handling was improved, and a harshness in the suspension when hitting rough pavement was eliminated.
I had heard that it was good to check the frame alignment on a classic K-bike, but this is my first direct experience doing so, and I'm very pleased with the results.
Your K75 goes >90mph?! You must have been in the red line zone or very close to it for sure.
Your K75 goes >90mph?! You must have been in the red line zone or very close to it for sure. You guys don't have speed law enforcement down there? Up here, speeding is worse than robbing a bank.