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honda hrc216 backfires at full throttle

Discussion in 'Mechanic and Repair' started by bladeheart, Apr 5, 2007.

  1. bladeheart

    bladeheart LawnSite Member
    Messages: 78

    Hello,

    My Honda hrc 216 backfires at full throttle. It will run, at full throttle although it will backfire constantly. At low idle it sounds perfect. I have changed the gas, and put a spare spark plug in it as well. Anyone have any ideas on what the problem could be?
     
  2. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Messages: 1,164

    A couple of things to check(valve adjustment, weak exhaust valve spring, deposit built up on valve and or guide) I would suspect your issue happens at higher RPMS and not idle because the valve cannot close fast enough.
     
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

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  4. bladeheart

    bladeheart LawnSite Member
    Messages: 78

    Here is an update, I bought an new ngk spark plug and it completely quit. The thing only has maybe 25-35 hours on it. I can't believe that it quit just like that with a new plug. Also the original plug looked great.
     
  5. bryand47

    bryand47 LawnSite Member
    Messages: 2

    I had similar symptoms on my Honda GXV340.
    Mixture was leaning out at high revs because of a flake of muck in the main jet. It ran fine at idle but couldn't get enough juice as the revs went up.
    Might be worth a quick look.
     
  6. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Messages: 963

    Did you put the old plug back in to see if the "quitting" problem is a bad new plug? It might be coincidence (since it WAS already acting up) or???
     
  7. bladeheart

    bladeheart LawnSite Member
    Messages: 78

    I will try just to see, btw its still running strong!
     
  8. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Messages: 963

    I misunderstood you. I thought you meant the engine quit:)
     

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