MOTOBRICK.COM

TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Kchop on October 22, 2026, 11:36:17 AM

Title: Front Suspension Noise k75s
Post by: Kchop on October 22, 2026, 11:36:17 AM

Hey Group,

K75s 1993

First off, thank you to everyone for the past advice, just finished roughly 1400mi in 5 days. (did most of the work myself)

When going around 70mph+ and hitting dips and uneven road, etc it sounds like noise from front suspension would be best described as crunching plastic. It seems to have gotten worse as ride went on.

In order of severity and likelihood what should I be checking?

Fork oil? Fork springs? Steering Head Bearings? Main Fairing bracket?

Title: Re: Front Suspension Noise k75s
Post by: daveson on October 26, 2026, 02:33:40 AM

I had a problem that sounds identical to your description, I like your description, I'm not too good at verbs or English as you will see, because, prior to today, I described it as plastic farts. The bikes I've had in the past that had gaiters on the forks, had small tubes for air to escape when the forks were compressed. One bike had gaiters that didn't have that feature. They were clamped to the forks with plastic zip ties which did the job, but after a while they loosened up. Still good enough for small bumps, the gaiters just expanded, but on bigger bumps the air escaped against the resistance of the zip ties.

The way I discovered the problem was with the front brakes applied to the stationary bike and pushing down on the handlebar. I solved the problem by poking a small hole at the rear of the gaiters.

You could get lucky having a helper with good ears, this might help to pinpoint the location of the noise. Probably not good to ask a helper who looks something like this:


17929880294686237526605967156083.jpg (16.45 kB . 460x276 - viewed 13 times)