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  1. #1

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    King motor 29cc loss compression after tuning.

    Hi. Today when i ride baja something shot and engine loss compression. I thought it was pullstart but it's not it. Pullstart run slightly and when the piston moves to the top it sounds metallic and run hard. What's happened? Recently i changed oryginal carb to walbro 668, pipe to ddm dominator and NGK Iridium spark plug. Power strongly increased, did engine could not stand this power?
    Sorry for my english - I\'\'m from Poland .

  2. #2

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    RE: King motor 29cc loss compression after tuning.

    Maybe you ran it too lean?

    Pull the plug and check the piston. You might have burned it.

    Bill S.
    Carl Goldberg Ultimate Brotherhood #56
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    http://radiocontrolhobbies.freeservers.com

  3. #3

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    RE: King motor 29cc loss compression after tuning.


    ORIGINAL: Twin_Flyer

    Maybe you ran it too lean?

    Pull the plug and check the piston. You might have burned it.

    Bill S.
    I don't think so, I ran it rich (1,5 turn on h needle), it smoked perfect and spark plug also is perfect. It burn only 7 liters...

    Sorry for my english - I\'\'m from Poland .

  4. #4

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    RE: King motor 29cc loss compression after tuning.

    Pull the head and inspect. If the engine ingested something you may only be out a head but running it more could blow the whole thing

  5. #5

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    Sorry for my english - I\'\'m from Poland .

  6. #6
    sparky 25's Avatar
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    RE: King motor 29cc loss compression after tuning.

    I had a needle bearing let go on my km 28.5cc engine,

    It left worse drag marks down the side of the piston and liner than that of what is on yours,

    I cleaned the engine out and reassembled it using a new bearing it would not start and compression was way down,

    So I pulled it apart, replaced the piston ring as they are real cheap, i thought i would try to work with what i had
    and it was back to running great, even pulling wheelies

    You need to take a look and see what made the marks on your piston, clean out the motor with petrol and replace the bearing if that done the damage,

    You may well need to replace the whole motor, but I would definitely try a new piston ring on what you have first,

    Some pics on this post http://www.rcuniverse.com/forum/fb.asp?m=9001819
    Its me is that you?

  7. #7

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    RE: King motor 29cc loss compression after tuning.

    The head is done. The marks on the transfer roofs are death to that cylinder. The piston is also done for. Inspect the crank, find out if a needle came out of one of the needle bearings. If not, and there is no damage to the crank or cases(sometimes they can be bad) just throw the 36mm head on with a good gasket, fresh piston and new bearing.

  8. #8

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    RE: King motor 29cc loss compression after tuning.

    Ok, thanks for opinions. I noticed two more things. First > http://imageshack.us/photo/my-images/88/imga0027k.jpg/
    The engine can run with it? Second thing > http://www.youtube.com/watch?v=kw_n_...ature=youtu.be - it's normal?
    i'm going to buy this kit - http://www.davesmotors.com/s.nl/c.88...t.A/id.8021/.f but i've got 2 bolt in engine not 4. Did i can drill in the engine?
    Sorry for my english - I\'\'m from Poland .

  9. #9

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    RE: King motor 29cc loss compression after tuning.

    Nope you can't drill the extra 2 holes. Just get this and use you other parts like fan, carb, pull start, covers ect (That's what I did)..

    http://www.ebay.com/itm/4-BOLTS-30-5...item2a1d08f727

  10. #10

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    RE: King motor 29cc loss compression after tuning.


    ORIGINAL: hooleydog

    Nope you can't drill the extra 2 holes. Just get this and use you other parts like fan, carb, pull start, covers ect (That's what I did)..

    http://www.ebay.com/itm/4-BOLTS-30-5...item2a1d08f727
    Did you have this kit? It's suspiciously cheap... how many gallon you have on it?

    Sorry for my english - I\'\'m from Poland .

  11. #11

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    RE: King motor 29cc loss compression after tuning.

    Yep I bought the kit cos of the 4 bolt head , and it's 30.5cc too. Runs great too (just do a careful break in. Then your good to go)..


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