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The Motobrick Workshop / Re: K75s Tire recommend
« Last post by Kchop on July 09, 2026, 01:16:09 PM »Anybody have dunlop 404's on and can comment??
Community of BMW K75 K100 K1 K1100 Indestructible Flying Brick Riders
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The Motobrick Workshop / Re: 85 K100 ...all of a sudden backfiring and stalling when HOT! Still not fixed!
« Last post by daveson on July 09, 2026, 12:14:34 AM »… In the 12 second video the probe enters the boot, does the wire lead go to ground…
The test light clamp is attached to battery positive. I posted more details in the comments section, I probably should have posted it in the description. Actually I should have shown it on the video, it would have only been a few extra seconds.
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The Motobrick Workshop / Re: K75s Tire recommend
« Last post by Edward on July 08, 2026, 10:18:12 PM »I have Conti RoadAttack 3 on my '87. (Soon to mount Conti SportAttack 5 on my MV to replace the 4s.) Rode to Vermont and back to that goofy rally on the 3s with excellent performance, traction-wise and wear. The stability was spot on. But, also, they are pricey.
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The Motobrick Workshop / Re: 85 K100 ...all of a sudden backfiring and stalling when HOT! Still not fixed!
« Last post by Laitch on July 08, 2026, 10:02:28 PM »Q Is the value of the temperature sensor @ 1.5 so low as to keep the bike from running?...TIAIf the value at the temp sensor was at 1.5KΩ when the engine was cold, that wouldn't be likely to activate enough fuel for a good start.
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The Motobrick Workshop / Re: 85 K100 ...all of a sudden backfiring and stalling when HOT! Still not fixed!
« Last post by Atabeach on July 08, 2026, 09:30:09 PM »Daveson, thanks for the 2 videos. … In the 12 second video the probe enters the boot, does the wire lead go to ground… I want to be sure. Thanks
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The Motobrick Workshop / Re: 85 K100 ...all of a sudden backfiring and stalling when HOT! Still not fixed!
« Last post by daveson on July 08, 2026, 09:14:45 PM »Another video, four seconds long, which should verify that the Hall sensor is sending a pulsing signal to the computer, and that the computer is sending a pulsing signal to the injectors.
https://youtube.com/shorts/Hqttqo-y0xg?si=H2fvwdDZ2N2eMD-G
https://youtube.com/shorts/Hqttqo-y0xg?si=H2fvwdDZ2N2eMD-G
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The Motobrick Workshop / Re: 85 K100 ...all of a sudden backfiring and stalling when HOT! Still not fixed!
« Last post by daveson on July 08, 2026, 08:59:38 PM »Don't have my books at the moment so limiting my replies.
Give the electrical plugs a good clean with the help of some electrical contact cleaner.
If the situation is still that the problem is much worse when the engine gets warm, this would be the best time to do tests, as it doesn't have enough time to cool down compared with bench testing. Also it could pass a static bench test, but might not pass a dynamic test while cranking.
Here's another, even quicker test. The test in this twelve second video will verify if the Hall sensor is sending a pulsing signal to the computer, and also verify if the computer is sending a pulsing signal to the coil. Then repeat the test for the other coil. This could be done with the fuse for the fuel pump removed.
https://youtube.com/shorts/5VrtFtr07-4?si=M8VIfew8xUk24JT2
Give the electrical plugs a good clean with the help of some electrical contact cleaner.
If the situation is still that the problem is much worse when the engine gets warm, this would be the best time to do tests, as it doesn't have enough time to cool down compared with bench testing. Also it could pass a static bench test, but might not pass a dynamic test while cranking.
Here's another, even quicker test. The test in this twelve second video will verify if the Hall sensor is sending a pulsing signal to the computer, and also verify if the computer is sending a pulsing signal to the coil. Then repeat the test for the other coil. This could be done with the fuse for the fuel pump removed.
https://youtube.com/shorts/5VrtFtr07-4?si=M8VIfew8xUk24JT2
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The Motobrick Workshop / Re: K75s Tire recommend
« Last post by Kchop on July 08, 2026, 08:31:08 PM »Thanks all
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The Motobrick Workshop / Re: K75s Tire recommend
« Last post by TriSpark on July 08, 2026, 07:32:19 PM »My K75 is wearing Shinko 712's back and front, and I like them a lot.
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The Motobrick Workshop / Re: 85 K100 ...all of a sudden backfiring and stalling when HOT! Still not fixed!
« Last post by Atabeach on July 08, 2026, 07:04:42 PM »Bike cold, starts right up but the hesitation is apparent right away...
1) Quick look at spark plug wires no signs or arcing...Coils no cracks , will bench test shortly.
2) test value of female pin 10 to ground is 1.5...this is below 2.5! I will be replacing temperature sensor either way....
3) bench test hall sensor..pins 2 & 5 ....all appears good.
Q Should I apply heat ( blow dryer ) to hall sensor?
Q Is the value of the temperature sensor @ 1.5 so low as to keep the bike from running?...TIA
1) Quick look at spark plug wires no signs or arcing...Coils no cracks , will bench test shortly.
2) test value of female pin 10 to ground is 1.5...this is below 2.5! I will be replacing temperature sensor either way....
3) bench test hall sensor..pins 2 & 5 ....all appears good.
Q Should I apply heat ( blow dryer ) to hall sensor?
Q Is the value of the temperature sensor @ 1.5 so low as to keep the bike from running?...TIA