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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. BMW K75S fuel pump removal BMW K75s restoration fuel tank clean and repair part 3 Fuel filter... http://www.k100.biz/pdf/OFF/K100_K75_2V_eng.pdf BMW Motorcycle Parts Fiche OEM BMW Motorcycle Parts online 1970 present BMW K75 Rider Manual English PDF Useful to K100 owners as well BMW K75 K100 K1...
Not sure about this, but you might want to find your fuel "reset" button for the fuel pump. It's usually located in the trunk.
You say that it's getting fuel to AND from the filter (?); there might not be enough pressure to get to the injectors.
Try turning the key on for a about 5 seconds, but don't try to start it. This actuates the fuel pump.. Do no pump the gas pedal. Turn the key off, then try to start it.
If it doesnt start, turn the key on but don't try to start it. Pump the gas pedal 2-3 times, then try to start. You usually should not pump the pedal, but in this case it might just need a little "kicker" to get gas through the line.
If it doesn't start repeat this procedure. Hopefully it starts.
Note: Never crank a car over for more than 4-5 seconds. It's hard on the starter and will wear your battery down really fast.
Check fuel pressure, should be no less than 4 psi. The fuel transfer pump is located on frame rail under drivers door, If fuel pump is bad replace it. If that doesn't solve your problem, you may have a bad injection pump. Please rate
is the engine actually cranking when it doesnt start or do you hear just one "click" each time you turn the key? if the engine is cranking, i would suspect a fuel problem, possibly fuel filter if it wasnt changed when the fuel pump was done. if it is not cranking and you hear one "click" upon turning the key, i would suspect faulty starter or connection problem.