Question about 1970 Honda CB 100

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I have a 1970 honda trail 90, it has spark and plug gets wet when i kick it over. but it wont start!! It sometimes will make a back fire noise, when trying to start it

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  • dano1877 Apr 29, 2010

    tried movin plate both ways still back firing when i kick it over!!



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Remove the points cover. Make a scratch mark with a pin or nail across join of points backing plate and the outer housing and loosen two screws holding the backing plate for the point breaker just enough to rotate the plate 1mm anti-clockwise. Tighten retaining screws. Try starting now. If no joy, repeat procedure moving clockwise 1mm forward of the mark. This can be achieved with the slot end of a screwdriver between the two lugs on plate. Cheers.

Posted on Apr 29, 2010

  • ckoira57
    ckoira57 Apr 30, 2010

    It is a matter of fine tuning that timing, ensure the spark plug gap is about 0.7-8mm and plug is good condition. The condition of the contact breakers has in impact on fatness of spark, give them a clean with some fine emery paper. Make sure the manifold between carby and inlet port is in good condition as does not leak ANY air! Fresh, correct octane fuel I presume?

  • ckoira57
    ckoira57 Apr 30, 2010

    Battery should be fully charged to get optimum chance of firing. Make sure all lights are turned off, and electrical connections are good. Have the valves and camchain been looked at or replaced recently?



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I would suggest that you cleanyour carburetors.
To tell if they need cleaned, spray carb clean in the back of the carb and the kick it over, if it starts right up, then you need to clean your carbs., Drain your gas tank and install a new fuel filter, and put new gas in the tank too.

If it doesn't start right up on the carb cleaner, then check to see if you are getting spark.
If you have spark, then test your compression.
Compression should be at least 125-145 psi but not less than 100 psi to run.

If you don't have spark, pull power wire off coil and see if you have power to the coil.
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As long as you have good compression, good fuel and good spark, that motor will start.

Pull out the plugs and see if they are dry, or wet or , black and sooty.
If dry - no fuel
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if black and sooty - clean & check gap or replace with new ones.

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