Join Date: Jun 2002
Location: Lubbock, TX, USA
Re: K100 Gear indicator.
Instrument cluster problems are very common on this model of k bike. Sometimes cleaning the pin connectors on the cluster helps. The ones I have worked on in the past frequently ended up with loose connections inside the cluster housing. There use to be a lot of info on these units in the IBMWR.org forum, tech support area.
I would not rule out the switch unit though. Especially on a bike that has set up for a long time.