Question about 1993 Honda NSR 250 MC 21

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Nsr 250 mc21 low on power

Very low on power and has starting problem, does anyone know what could cause this

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You don't give much information on how the bike is running.  But most times when there is a performance decease it is best to clean the fuel system.  Spray some Gum Out or similar product( I prefer Deep Creep and Sea Foam) in the carb. then follow up with some in the tank.  Also change the fuel filter.
  

Posted on Jan 05, 2009

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Posted on Jan 02, 2017

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Hi there, I have a Honda nsr MC21. I have been told that my crankshaft bearings/seal has gone. The bike wont start, if I spray/leak a little fuel directly into the carbs, it starts like a dream. I was told...


Difficult starting is a classic example of a faulty centre seal.The seals tend to harden up and leak after time and particularly with certain fuels.

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1993 Honda NSR 250 MC 21 how to replace the clutch


Hi, Jachoneethli for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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1 Answer

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Hi, Mahammed and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty pulse coil.
8. Faulty CKP, CMP, or BAS sensor.
9. Faulty ignition switch.
10. Faulty run/off switch
11. Tilt sensor needs a reset.
12. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
NSR250 Forums View topic No Spark on MC21
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NSR250 MC21 92 Not hitting power band, fine until around 7000rpm


not familiar with your bike but some bikes have electric controlled power band an some have mechanical.Electric ones usually do a quick self diagnostic on start up hope that helps

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1 Answer

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