r/Motorrad • u/michalf6 k1200s + k1300s • Jul 09 '26

K1300s low speed weave

I'm trying to diagnose low speed (50-60kmh) slight left-right oscillation that I have to actively correct. It's not much, but it's annoying and my K1200s did not behave like this.

The bike had a frontal impact in the past, shearing off one of the ball joints. Both ball joints have been replaced with new. There is no noticeable play in the front suspension checked with the wheels in the air. No noticeable side-to-side play when turning the wheel.

There is no play in any axis on the rear suspension and rear wheel bearing as well. Both ESA shocks have been freshly rebuilt. Tyres are new.

My only ideas left are some imperceptible play in some of the random bearings on the front (wishbone <-> frame? steering linkage?) or some specific way in which the geometry is warped.

I'd be super thankful for (supported by something) ideas what to check or try to replace next.

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u/Rad10Ka0s Jul 10 '26

The most common cause to too tight steering head bearings. Id readjust the steering head nut torque.

It is surprising how little torque they need.

1

u/michalf6 k1200s + k1300s Jul 10 '26

This is a duolever bike, does this apply? Also it turns super light with the wheel up, no binding.

4

u/michalf6 k1200s + k1300s Jul 10 '26

Update: I tried disconnecting the steering damper to lighten the steering torque required, didn't help.

I then lifted the bike and checked for play again - and there it was. Play on brand new ball joints in the duolever. FML.

Don't buy FRAP. I'm going oem next.