BMW K75 S | How to Replace the Thermostat & Coolant Temperature Sensor

This 1988 BMW K75 S was running rich and having trouble warming up to temperature. Lately, it has been really cold and I was having trouble starting up the bike. When it wouldn't start this time, I pulled the spark plug and they were completely fouled and smelled of fuel. After a bit of research, the culprit appears to be the coolant temperature sensor. While I was there, I thought it would be a good idea to replace the thermostat as well.
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Links to all the parts mentioned in this video:
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▶ BMW K75 S Coolant Temperature Sensor: amzn.to/4a2VcAO or ebay.us/gq6sin
▶ BMW K75 S Thermostat: ebay.us/IdXyzN
This video is not sponsored, but product links are affiliate links which means if you buy something I'll receive a small commission.
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Merchandise
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▶ Comprehensive Vehicle Maintenance Log Book: amzn.to/3wc2EMl
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Social Media Links:
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TIMESTAMPS
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00:00 BMW K75 s not starting
00:16 Pulled spark plugs on BMW K75 s
01:44 Removing BMW K75 s thermostat housing
02:24 Pulled BMW K75 s thermostat
02:59 Comparing the BMW K75 OEM thermostat with Stant automotive thermostat
03:40 Installed Stant thermostat in BMW K75
04:00 Removing BMW K75 Radiator to gain access to the coolant temperature sensor
04:36 Pulling the coolant temperature sensor wire from BMW K75
06:02 Pulling Stant thermostat and replacing the OEM style thermostat from Euromoto Electric on BMW K75
08:18 Fixing exposed BMW K75 coolant temperature sensor wire using brushable electrical tape
10:18 Testing BMW K75 after replacing temperature sensor and thermostat to see if running improves
#bmwk75 #bmwk100 #projectbike

[@ghyberghyber]

Thanks for the video. BMW parts is pretty much the only way to keep the vintage K-bike working properly. Also, you have the wrong coolant; it should be blue.

[@kintsugimoto]

Thanks for that tip. Is the blue coolant from BMW? I went with Snowbum's recommendation to use the Pennzoil coolant. I've been running it for over a year and even in 100+ degrees, it seems to be holding up OK. But I'll probably switch it over to the OEM stuff next time. There isn't that much savings by using aftermarket. Thanks again!!

[@errolglidden3969]

You had a mouse chew through that wire. Same thing happened to me. Put a mouse trap close to your bike.

[@kintsugimoto]

Ahhh, yes you're probably right !!! I bought this as a non-running storage unit find, so it didn't come with much history. It's in my garage now ... so it should be safe from our little friends :) lol