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The Motobrick Workshop / Re: Dies when Hot
« Last post by bast1472 on Today at 02:53:55 AM »
This is probably a long shot, but I had these exact same symptoms when I first got my '95 a few years ago. The culprit ended up being the leads that connect to the fuel pump. One of them had come loose, and for some reason it would run fine until the bike got hot, then the fuel pump would randomly cut out. Check that those connectors are crimped tight and attached securely to the blades on the fuel pump. When I looked at mine it was black from arcing inside the tank 😱
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The Motobrick Workshop / Re: K75 difficult to start, runs extremely rich
« Last post by bast1472 on Today at 02:47:39 AM »
Yeah, it beeps when I touch the red and black leads together. I just looked at the instruction manual and saw that it defaults to continuity mode, which still seems to show ohms when resistance is measured, but I went back anyways and re-tested everything in ohms mode. The results were the same ¯\_(ツ)_/¯
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The Motobrick Workshop / Re: K75 difficult to start, runs extremely rich
« Last post by frankenduck on Today at 02:43:47 AM »
Does it beep when you touch the red and black leads together?

From pics of it it looks like the ohms position has two functions:
1 - Audible continuity tester
2 - Ohms

I think to get it in ohms mode that you need to turn it on to the second to the last on the right setting and then hit the SEL button to get it into ohms mode.
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The Motobrick Workshop / Re: K75 difficult to start, runs extremely rich
« Last post by bast1472 on Today at 02:29:51 AM »
Frankenduck -- I'm getting infinite resistance between pin E of the temp relay socket and ground. Yes, my sensor has the wire clip (which is an annoying PITA to release, but it is there), and I've always reinstalled them correctly to keep any plugs from backing out. My new meter is a Klein MM420. It is a little curious that my old meter was showing a resistance reading between 10 and 13 and this one has only ever shown OL. Unfortunately I already gave the old cheapo one away.
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The Motobrick Workshop / Re: K75 difficult to start, runs extremely rich
« Last post by frankenduck on Today at 02:14:38 AM »
Quote from: bast1472 on Today at 02:08:04 AM
Frankenduck -- I've tried two different sensors (off the bike) and I cannot get a reading, only open loop, probing either blade with one probe, and the threads/brass body with the other probe.

What's the name/model of your multimeter?
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The Motobrick Workshop / Re: K75 difficult to start, runs extremely rich
« Last post by frankenduck on Today at 02:12:06 AM »
Measure the resistance between pin E of the temp relay socket and ground. VIO/GRN wire.



When you replaced the temp sensor did you have the wire clip on the connector? (Similar to the fuel injectors.)



On my K100 a previous owner had forgetton forgot that and the connector eventually fell off of the temp sensor.


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The Motobrick Workshop / Re: K75 difficult to start, runs extremely rich
« Last post by bast1472 on Today at 02:08:04 AM »
Frankenduck -- I've tried two different sensors (off the bike) and I cannot get a reading, only open loop, probing either blade with one probe, and the threads/brass body with the other probe.
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The Motobrick Workshop / Re: K75 difficult to start, runs extremely rich
« Last post by bast1472 on Today at 01:49:35 AM »
Laitch -- I get 0.0 when touching the meter's red and black leads in Ω mode, and OL when they're not touching. The resistance between 10 and 5 is OL, and the resistance between 5 and 13 is 0.0.
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The Motobrick Workshop / Re: K75 difficult to start, runs extremely rich
« Last post by Laitch on May 15, 2024, 11:40:12 PM »
With the multimeter turned On, did you touch the red and black probes together in the Ω setting before testing?
What is the resistance between 10 and 5?What is the resistance between 5 and 13?
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The Motobrick Workshop / Re: K75 difficult to start, runs extremely rich
« Last post by frankenduck on May 15, 2024, 11:02:12 PM »
The temp relay has no impact on the reading at pin 10. Pin 13 is ground.

The coolant sensor is a dual sensor with two wires - one wire goes to pin E of the temp relay and the other wire goes to Pin 10 of the L-Jetronic. You can use any ground or Pin 13 for the other ohmmeter lead.

The temp sensor grounds via the threads.  To measure an uninstalled temp sensor you measure from one terminal or the other to the metal body of it.

See green lines in this diagram:


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