Question about BMW K 75 S Motorcycles

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I have a 1986 BMW K75C and I just replaced the spark plugs, coolant, oil, and put gas in it. The problem is, that it will now not start. I tried opening the choke, pulling the clutch lever, etc. It whines like its trying to start, but will never catch. It is kind of cold, about 55 degrees. The spark plug are the correct ones, with the cap on the end, and gapped correctly.

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  • BMW Master
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Probly not gitten spark cause ign is worn--may not be gitten proper fuel intake also--bike is old so du a compression test

Posted on Oct 06, 2010

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1 Answer

Motorcycle not getting spark


try new spark plug or check that you have not put to much oil in clean where spark plug gos all so if you have to keep chageing the batarry you may of over cooked it

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Hi, Anonymous if you have a CKP sensor it needs compression to send the correct signal to the ICM/ECM, make sure both spark plugs are in heads and use a grounded third plug to check for spark or hold spark plug cable close to spark plug in the head. If still not getting spark the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, 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.
3. Loose connection at ignition coil or plug between ignition sensor and module.
4. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, or BAS sensor.
7. Faulty ignition switch.
8. Security alarm failing to disarm needs reset
For more information about your issue, please visit the websites below. Good luck and have a nice day.
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https://www.tradebit.com/filesharing.php/search/0/1986+bmw+k75c
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1 Answer

Bmw k75c fuelpump fault &or remove


Hi, Tonyhickey52 if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will idle and run poorly, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition.
1. If your battery was 3 years or older when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging remove the leads and let the battery sit for a couple of hours then check the battery voltage with a volt meter, you should have 12.5 volts or better, any readings in the 11 volt range you need to do a proper load test on the battery and replace as necessary, any readings in the 10 volt range you have a dead cell and replace the battery.
4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove your air cleaner and clean and re-oil per Mfg. specifications.
6. Remove the carburetor, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
7. Remove fuel valve and filter disassemble and clean as necessary, remove fuel lines and replace with new ones.
8. Replace spark plug with a new one and check for spark.
For more information about your issue please visit the websites below. Good luck and have a nice day.
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So i have a problem with my 2002 grand prix gt it has 120,000 miles on it. i was coming home from work one night and the low coolant light came on it got pretty hot but i made it home. My dad put coolant...


Check for spark at the plugs and check the fuel pressure. Also remove the spark plugs and check for fouled or wet plugs. A plug that is saturated with gas will not spark. Clean the plugs and dry them off and try to start. If all looks good then check cylinder compression to check for a blown head gasket.

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I just bought a 1986 BMW 325 that starts fine when cold. When the engine is hot and I try to start it puts out black smoke and idles rough and dies. Where do I start to look to fix this?


Coolant temperture sensor. Look at the front of the cylinder head. There will be a square 3 pin connector. This should be the one you need to replace. What happens is that it is stuck telling the computer that the coolant is cold thus providing more fuel to start. Once the system is warm this excess fuel is not needed and can create the black (raw fuel) smoke that is coming from the tail pipe once warm. This is a very simple repair. Let me know if you need anything else.

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1 Answer

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I'd personally start by checking the basic ignition components; spark plugs, spark plug wires, distributor cap and rotor. If any of these items are damaged, worn or just no longer up to specification then they're likely to be the culprit. Mine just went through a spate of stalling and wouldn't restart because the wires were no longer insulating properly...weak spark, wouldn't ignite the fuel.

Let us know if this helps, and if not try to provide some more detail regarding the conditions when this is occuring.

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