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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Conrad325i on March 12, 2016, 10:14:31 AM

Title: Engine Temp Sensor
Post by: Conrad325i on March 12, 2016, 10:14:31 AM

Howdy gents,

What are the symptoms of a bad Temp Sensor, how do you test it?

Thanks.

EDIT:
http://hrsbstaff.ednet.ns.ca/bvogel/K100/download/bike-wont-start1.htm

Title: Re: Engine Temp Sensor
Post by: Laitch on March 12, 2016, 12:59:20 PM

What's your problem?
You added that flow chart. Are we to understand from that you've done all those tests?

Title: Re: Engine Temp Sensor
Post by: motodude on March 12, 2016, 01:43:02 PM

I had an '87 K100RS that would "stumble" when it was cold outside and the engine was not completely warmed up.  By, "cold" I mean low 30's high 20's F.

The best way, is to use an ohm meter at various temps and compare to the values in that troubleshooting document (or maybe the data was somewhere else).  My bad one would "track" properly across various temps but was was an order of magnitude or two off.  Replacing the temp sensor solved the stumbling issue.

Tom

Title: Re: Engine Temp Sensor
Post by: Martin on March 12, 2016, 02:32:48 PM

A bad temp sensor or bad wire connection can make it flood on start up. If it is flooding badly and you are stuck, pull the No 6 fuse Krafftstoppe until it fires and as it dies, ram the fuse home. It will be running badly but at least you can limp home. In order to test it you will need a multimeter and a thermometer and a pan of water. Compare the resistance to the temperature as per the chart as you raise the temperature of the water. A bad connection is more likely than a bad sensor.
Regards Martin.