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Technical 49 styleline flatspot

Discussion in 'Traditional Customs' started by motleycrue, May 25, 2023.

  1. motleycrue
    Joined: May 13, 2013
    Posts: 203

    motleycrue
    Member

    help guys, 216 s/six,,, carter yf,, petronix elec ign, been off road for few months, took her out, running like crap, stalling, found water in fuel, had carb off a few times, drained tank, fitted inline filters and glass bowl,new insulator spacer ,old one was broken and had like a metal ring inside, new one dont. now a flat spot when trying to rev, lost confidence driving her, any ideas? ive fitted new elec fuel pump, thinking of getting new carb, help plz
     
  2. Old-Soul
    Joined: Jun 16, 2007
    Posts: 3,774

    Old-Soul
    Member

    Carb off an rebuild or just off? Accelerator pump perhaps?
     
    hrm2k likes this.
  3. motleycrue
    Joined: May 13, 2013
    Posts: 203

    motleycrue
    Member

    just carb off, cleaned out, and i dont know what pump is, is it the rubber diaphram thing?
     
  4. motleycrue
    Joined: May 13, 2013
    Posts: 203

    motleycrue
    Member

    for last few months, each time i took her out, it would start to sort of splutter, as driving, then clear, then at lights could cut out, then spin for ages before starting again
     

  5. lostmind
    Joined: Aug 21, 2011
    Posts: 3,317

    lostmind
    Member

    Did you drain ALL gas and replace.?
     
  6. motleycrue
    Joined: May 13, 2013
    Posts: 203

    motleycrue
    Member

    yes, as best i could from plug on tank, replaced 3 filters i have on, and fitted a glass bowl water trap
     
    lostmind likes this.
  7. lostmind
    Joined: Aug 21, 2011
    Posts: 3,317

    lostmind
    Member

    50% of fuel problems are ignition related
    50% of ignition problems are fuel related
    I will say I chased the same symptoms , would stop on the side of the
    road. I was always by myself , so had problems checking for fuel and spark with no one to work the key
    Would start after a rest for awhile and drive on home.
    Ended up the secondary coil wire had a gap inside the carbon thread, I guess it would heat up the coil and shut it down until it cooled.
    Yes , these were " new" wires.
    If you have an ohmmeter you can check coil and wires pretty easy.
    If you have a mechanical fuel pump , you can bypass it and run on just the electric to test if it is affecting it.
    Good luck
     
  8. motleycrue
    Joined: May 13, 2013
    Posts: 203

    motleycrue
    Member

    i fitted new elec pump today, exactly same,i did have prob of float sticking and fuel overflow but i think i sorted that
     
  9. motleycrue
    Joined: May 13, 2013
    Posts: 203

    motleycrue
    Member

    i try to rev, it just is flat, nothing happens then it does
     
  10. TexasHardcore
    Joined: May 30, 2003
    Posts: 5,041

    TexasHardcore
    Member
    from Austin-ish

    timing, advance, weak spark from coil, bad ground, vacuum leak...the list goes on
     
    olscrounger likes this.
  11. carbking
    Joined: Dec 20, 2008
    Posts: 3,729

    carbking
    Member

    Four possibles come to mind (obviously, there are more):

    (1) Pertronix does not like a generator, have you upgraded to an alternator?
    (2) The FLAPS carb kits have a fuel valve with too large an orifice (for Ford 300 CID). Even with the correct fuel orifice, that carb likes about 3~3.5 psi fuel pressure. With the Ford valve, it will flood at idle! How much pressure do you get from the electric pump and what valve do you have?
    (3) The accelerator pump is a diaphragm. The older neoprene diaphragms don't like ethanol. We have the option in our kits for either neoprene, or a diaphragm that is advertised as ethanol-resistant. The ethanol-resistant diaphragms are red, the neoprene are black.
    (4) Some of the early YF's (including all, I think, for the 216) used both a check ball and a square weight for the accelerator pump discharge check valve. Newer (1955???) YF's discontinued the ball and weight, and superseded these with a square pointed needle because folks kept losing the weight, and fuel would syphon through the pump circuit. The better kits (maybe all of them today) have the pointed needle rather than the ball.

    Suggestion: forget about a newer carburetor. That Carter YF is an excellent carburetor, and parts to repair yours, if needed, are readily available. (Opinion) the only better carb would be the older Carter W-1 used on the 1946~1948 216 engine. And NOTHING newer than 1970 is as good! But before throwing rocks at the carb, check out both the ignition, and the fuel delivery system.

    Jon
     
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  12. motleycrue
    Joined: May 13, 2013
    Posts: 203

    motleycrue
    Member

    thanx jon, its a carter yf,i bought 10 yrs ago, the new elec pump is 3.5,
     
  13. carbking
    Joined: Dec 20, 2008
    Posts: 3,729

    carbking
    Member

    Most of the Carter type YF carburetors have a 3 or 4 digit number STAMPED (a recessed number, not a raised number) on the center section (bowl) for identification. The number will be followed by the letter "S" as in (S)am. And possibly, a second letter following the "S".

    Examples: 964S, 938SD, 2100S

    Should you ever need parts, this number will be required.

    Jon
     
    Okie Pete likes this.
  14. motleycrue
    Joined: May 13, 2013
    Posts: 203

    motleycrue
    Member

    update, i took carb off again, made sure float was correct level, elec fuel pump, working well, revving up fine, smooth,except that flat spot at first trying to rev, cant find any air leaks,,its pissing me off now, annoying,
     

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