'97 EVO EFI noise?

Discussion in 'Electrical' started by Dean Chowenhill, May 19, 2009.

  1. Dean Chowenhill

    Dean Chowenhill Member

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    I have a "rattling" noise I can not locate. It has been there for a while. Recently, new pistons, cam and lifters - noise still there.
    I suspect it is in the EFI system, maybe a solinoid.

    It happens between 2,500 and 3,000 rpm and mainly when slightly accelerating.

    Any help out there on this one?

    dean
     
  2. glider

    glider Veteran Member

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    What octane fuel? You need a good grade of high test if it's pinging/rattling.(93 octane like Sunoco)
     
  3. R. Lewis

    R. Lewis Senior Member Retired Moderators

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    Just asking here ---- could it be a loose header pipe / exhaust "rattling" ???
     
  4. Dean Chowenhill

    Dean Chowenhill Member

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    Not pinging - using the highest octane gas I can buy in CA. I know pinging. This is more like rattling marbles in a tin can. Not on hard acceleration - constant rattling at about 2,800 rpm.
    I read a lot of your answers and respect your opinion, thanks for the info.
    dean

    Exactly what it sounds like and is the first thing I checked and double checked. The noise is higher in the engine.
     
    Last edited by a moderator: May 20, 2009
  5. Fossil

    Fossil Active Member

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    Recently, new pistons, cam and lifters - noise still there.
    Have you checked to make sure the push rods are adjusted right? As in are you sure you do not have a lifter failing to pump up. Being an Ultra there could be some thing in the fairing, etc. rattling. Fossil
     
  6. glider

    glider Veteran Member

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    CA kind of says it all. The lean running engines in CA have a host of problems. Try an octane booster and see if it helps eliminate the noise. Being a '97 bike, I would think it is a carbed engine so a rejetting may help your problem. The low speed circuit should be upped to a #46 jet. If it is a fuel injected bike, then a TFI would do the job.

    You didn't mention the octane rating of the fuel you use.
     
  7. STEVE07

    STEVE07 Well-Known Member Staff Member Super Moderators

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    If you eliminate it being a detonation ping and you have no exhaust leak stiick a small bar with a 90*bend on it into your mufflers,grab the baffles with it and give them a little push,then a tug.A loose baffle can give a terrible rattle at certain rpm's