Indian Four 1932 - problem with 3rd cylinder

Discussion in '1970's and Earlier Indian Motorcycles' started by Tomas Jacko, Jan 28, 2021.

  1. Tomas Jacko

    Tomas Jacko New Member

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    Hello,

    My name is Tomas and I live in Czech Republic in Central Europe. And of course sorry for my bad English.

    I am contacting all of you for advice when I am finding a solution for my specific problem. I believe that there are skilled mechanics among you with many years of experience can help.

    I recently bought an Indian Four motorcycle from 1932.
    The bike is after a complete renovation, including the engine.
    And just when the engine was running in, a fault appeared that I can't handle.
    The third cylinder burns the mixture imperfectly, it works at about 30%, the spark plug is after disassembly wet and unburned.
    The other cylinders work without problems.
    I was able to rule out a fault on ignition, including another cables and spark plugs (I use NGK AB-6).
    This indicates me a problem in the mechanical part.
    The compression on all cylinders is about 4.6 atm (67.601 PSI). Valve clearances are: intake valve=0.15 mm (0.59 in), exhaust valve=0.25 mm (0.98 in).
    The engine willingly starts and responds quickly to the accelerating of throttle.
    That the cylinder does not work properly, despite the spark plug spark gives, I detected using a thermal camera (see attached, heat difference between 3rd (70.73°C=159.31 F) and 4th cylinder (127.15°C=260.87 F) .
    I want to ask you for advice if someone would give me the answer where to look for a problem solving.
    I've heard that third cylinders have always had a problem, but I can't believe it's been over 1 hour engine run-in.

    Thank You for all your advices and responses.
     

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  2. Bobby Jesus

    Bobby Jesus Chainsaw God
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    Dales wheels through time. Contact them through email. He has a motorcycle museum and has several inline 4 models. They are experts in classic motorcycles. You can see their videos on you tube as well. Good luck.
     
  3. Tomas Jacko

    Tomas Jacko New Member

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    Thank you very much. I will try.
     
  4. Bobby Jesus

    Bobby Jesus Chainsaw God
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    Please post pictures of your bike. It's my favorite Indian as well as other members on this forum.
     
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  5. Tomas Jacko

    Tomas Jacko New Member

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    Hey,

    I probably solved the problem. After reading your advices and checking everything over and over, I came up with the following:
    1. My original magneto had a weak magnets. This caused the spark to be weak and unable to ignite the mixture inside the cylinder.
    Questions: How is it possible that three cylinders work and one does not. Why the spark from 3rd cylinder is always wet? The answer: Rich mixture.
    2. That led me to the second problem. Carburetor.
    The carburetor is not a complicated part. Unfortunately, during the general renovation, someone folded one of the needles (idle) incorrectly. Above the needle there should be a spring which allows to control the richness of the mixture. Someone put that goddamn spring on the needle from below. This ignorance caused the needle was open and a rich mixture to fly into the cylinders. Such a rich mixture could not be ignited at idle in cylinder no. 3 and in cylinder no. 4 there were insufficient explosions as well, although it was not heard. Now I will want to fine-tune it and I believe that we will only have pleasant moments with the new motorcycle for future.

    Let me to thank you for your advices, contacts and support. The sun is coming. When I pull out my Indian from the garage, take a few photos and put them here.
     
  6. Alpal

    Alpal Gold Member
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    Looking forward to the pictures,.........love the Indian Fou4,.....
    Alpal
     
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  7. Baldhead_J

    Baldhead_J Gold Member
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    THIS
     
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  8. Alpal

    Alpal Gold Member
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    Did you see what I did there?:oops:o_O,.....:rolleyes:;)
    Alpal
     

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