Question about 1991 BMW K 100 LT

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Riding the bike it intermediatly looses power, does not backfire,

Bmw 1992 k100lt, normaly goes great, 100,000 ks on the clock, about a year ago, every now and then it used to miss after take off i used to pull over, switch ignition off and on, after that it used to hum without loosing a beat. It would be fine for months, then about a month ago it began to miss while riding to work and backfired, I managed to nurse it to work, after work i started it but would not accelerate, it would idle but have a big flat spot on acceleration, it felt like the throttle body sensor was not telling the ecu to give more gas, I decided to remove all the fuses check them and pet them back, after that it started and ran purfectly, today it played up again, checked the fuses but made no difference, i managed to nurse it home, it felt like the igntion key is switching off and on, definitely electrical, i replaced the fuel filter 4,000 cliks ago, is there a scanner interface connector somewhere? I always run premium fuel, I topped the tank today, but made no difference to the problem. I'll check the fuse connectors this weekend, they fit real loose, as with any intermittant problem most of the time you'll find the problem when it dies completely, lets hope some-one out there has come across the same problem, cheers

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Hi, Philqsa and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intake air leak.
8. Water, dirt, or rust in the fuel system, carburetor and/or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose, dirty, or corroded ignition module connector at crankcase.
13. Faulty MAP, CKP, O2, and/or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damaged intake or exhaust valve.
For more information about your issue, please visit the websites below. Good luck and have nice a day.
troubleshooting starting
K75 Throttle Response Hesitation Off Idle BMW K75 K100 K1
http://www.k100.biz/pdf/OFF/K100_K75_2V_eng.pdf
BMW Motorcycle Parts Fiche OEM BMW Motorcycle Parts online 1970 present BMW
http://www.bmw-motorrad.com/us/en/index.html?content=http://www.bmw-motorrad.com/us/en/services/manuals/manuals_main.html¬rack=1

Posted on Dec 28, 2015

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2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
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