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  1. #1

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    new engine back fire?

    I just put a new sh.18 in my lightning and im now trting to break it in. after a full pulls it sounds like it back fires. does any one know what this is?

  2. #2
    cummins driver's Avatar
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    RE: new engine back fire?

    I havent ever heard a nitro engine backfire that i can think of. Does it make the noise while you are cranking or right when you stop cranking?

    I have however, had one of my old nitro engines run backwards. It was wild to see a nitro with no reverse start driving in reverse!
    - Savage - MGT Pulling Truck - Losi LST2 - Brushless Blitz - RC10GT (getting a 2.5) - Brushless T4 - Sportwerks Mayhem Pro

  3. #3

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    RE: new engine back fire?

    its not really like a real cars backfire but more like its building up pressure and then releasing it all at once. like a release vaulve on a air compresser.

  4. #4

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    RE: new engine back fire?

    maybe something is clogging the exhaust port or its building up too much fuel and giving an air release type of sound?
    125 characters and 2 lines is not enough to list my RC obsession!!!

  5. #5
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    RE: new engine back fire?

    i have never head of a 2 stroke engine back fireing...

    humn...
    Who ever said \"It never Changes it just gets better\" Is a lire!

  6. #6

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    RE: new engine back fire?

    does it feel different when u pull on it???...does it try to start???...
    keep the shiney side up, the hammer down and the marshalls bored.....himoto rxb-1...himotoracingusa

  7. #7

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    RE: new engine back fire?

    are you sure it just not the compression you are hereing bro
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  8. #8

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    RE: new engine back fire?

    it could be that too, the engine is new and has alot of pinch
    125 characters and 2 lines is not enough to list my RC obsession!!!

  9. #9
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    RE: new engine back fire?


    ORIGINAL: HimotoRacingUSA

    it could be that too, the engine is new and has alot of pinch
    That's what I was thinking. I have had engines so tight that the starter was hard to pull.
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  10. #10

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    RE: new engine back fire?

    my sh.18 was like that ..its tight with alot of punch to it
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  11. #11

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    RE: new engine back fire?

    The way i meant it was that its compression. pull, pull, pull, large pop of air. this is my first new motor so ive never encountered this before. the pinch between the piston and sleeve is ridiculous. I have to almost stand on the car to be able to pull the starter.

  12. #12

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    RE: new engine back fire?

    yeah thats the way mine was .and still like that some times ...lot of compression there bro .did it start up
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  13. #13

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    RE: new engine back fire?

    not yet. its really starting to p*ss me off. I think i may of upset my neighbors with all the cussing.

  14. #14
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    RE: new engine back fire?

    Did you adjust your needle settings? Sometimes the factory setting are so rich that the engine won't start. Did you check your plug and igniter?
    AllAboutFunHobbies / Himoto Racing USA / Redcat Racing / MXT-2S / MTR-2S / XMod / and a few Tremors

  15. #15

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    RE: new engine back fire?

    mine used to backfire when the plug is almost done because the gas getting out of the engine and into the hot manifold and exploding making the backfireing sound

  16. #16

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    RE: new engine back fire?

    also heating it up is a help
    Cen truggy, Bigfoot 1/5th, Cen buggy, Mg16, Redcat Earthquake, Redcat Drifter

  17. #17

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    RE: new engine back fire?

    ORIGINAL: tylerjackson

    not yet. its really starting to p*ss me off. I think i may of upset my neighbors with all the cussing.

    sounds like your flooding it out, take the plug out, turn it over, pull the pullstart and let the excess fuel out and put the plug back in and try again. Also check your needle settings, 2 1/2 out on the high and 4 out on the low. If its cold out, heat the engine with a heat gun or a blow dryer to get it started.
    125 characters and 2 lines is not enough to list my RC obsession!!!

  18. #18

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    RE: new engine back fire?


    ORIGINAL: tylerjackson

    not yet. its really starting to p*ss me off. I think i may of upset my neighbors with all the cussing.





    lol....whenever I get a new car I havta take it across the street and show it off to my neighbor and his wife or they get upset...they are an older couple...they love to watch me run them up and down the street....he tells me my 1/8th buggies sound like p*ss*d off chansaws on steriods...lol
    keep the shiney side up, the hammer down and the marshalls bored.....himoto rxb-1...himotoracingusa

  19. #19

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    RE: new engine back fire?

    i eventually got it to run about 15 minutes of breakin done.

  20. #20

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    RE: new engine back fire?


    ORIGINAL: tylerjackson

    i eventually got it to run about 15 minutes of breakin done.

    its a start, lol
    125 characters and 2 lines is not enough to list my RC obsession!!!

  21. #21

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    RE: new engine back fire?

    I believe the needles my of been a bit off, between that and the 7,682 pulls it took it finally started.


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